1981 Oldsmobile Ninety-Eight Differentials

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    • (0 reviews)
      # 1029200515
      Oldsmobile Ninety-Eight with 28 Spline with GM 8.5" Series Axle with 2.73 and Up Gear Ratio with 10 Bolt 1981, ECTED Max™ Rear Limited Slip Differential by Auburn Gear®. with Selectable Full Locker. Location: Rear. The ECTED Max is a...
      Expertly crafted from superior materialsProvides exceptional reliability
      $740.21
    • (0 reviews)
      # 503623346
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Ring and Pinion Gear Set by Motive Gear®. Motive Gear stock performance ring and pinions are excellent replacements for OE. Experienced installers prefer ring and pinions for easy setup,...
      Quiet operationComputer controlled heat treatment
      $199.86 - $251.95
    • (0 reviews)
      # 503323075
      Oldsmobile Ninety-Eight with Open Differential 1981, No-Slip Traction System by Powertrax®. For vehicles that are driven daily, the Powertrax No-Slip Traction System is the latest design in quiet traction-adding differential technology....
      Extreme Traction PerformanceEnables a 2 Wheel Drive to outperform a 4 Wheel Drive in poor traction conditions
      $418.28 - $473.69
    • (0 reviews)
      # 503560495
      Oldsmobile Ninety-Eight with 28 Spline 1981, Open Grip LS Traction System by Powertrax®. The Powertrax Grip LS, is a clutch-type differential in a forged steel case. This differential uses a set of carbon clutch discs to provide...
      Comes Fully AssembledCarbon Fiber and Steel Friction Plate Technology
      $443.35 - $457.67
    • (0 reviews)
      # mpn4517168200
      Oldsmobile Ninety-Eight with 1.16" Axle Shaft Diameter with GM 7.5" Series Axle with 3.23 and Up Gear Ratio with 10 Bolt 1981, Detroit Locker™ Rear Differential by Eaton®. Location: Rear. The Detroit Locker is a 100%-automatic locking...
      100% automatic locking - no driver action neededProvides maximum amount of traction to both wheel ends
      $730.29
    • (0 reviews)
      # 1029208641
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Posi™ Rear Differential by Eaton®. Location: Rear. The Eaton Posi limited-slip differential prevents wheel slip before it can get started. To do that, carbon disc clutch packs, preloaded by a...
      Superior rebuildable designRace-bred carbon friction discs
      $499.99 - $504.99
    • (0 reviews)
      # mpn4517168181
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle with 2.73 and Up Gear Ratio with 10 Bolt 1981, Differential Carrier by Motive Gear®. without Internal Kit. All Motive Gear products are engineered for their specific application and...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $77.55
    • (1 review)
      # 503587224
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle / with GM 8.625" Series Axle with 2.73 and Up Gear Ratio with 10 Bolt 1981, Performance Ring and Pinion Gear Set by Motive Gear®. Motive Gear Performance ring and pinions are perfect for...
      Central contact patternCNC start to finish
      $210.38 - $265.28
    • (0 reviews)
      # mpn4517172536
      Oldsmobile Ninety-Eight with GM 7.5" Series Axle with 3.23 and Up Gear Ratio with 10 Bolt 1981, Rear Pro Gear Ring and Pinion Gear Set by Motive Gear®. Location: Rear. Motive Gear Pro Gear ring and pinions are perfect for dedicated...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $448.50
    • (0 reviews)
      # 1029361527
      Oldsmobile Ninety-Eight with 10 Bolt 1981, HP™ Rear Limited Slip Differential by Auburn Gear®. Location: Rear. High Performance. Auburn Gear’s flagship limited-slip differential gives you smooth torque-sensing operation with the...
      Expertly crafted from superior materialsProvides exceptional reliability
      $416.16
    • (0 reviews)
      # 1029163629
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Pro™ Rear Limited Slip Differential by Auburn Gear®. Location: Rear. Turns your torque up another notch, offering an even higher bias ratio and faster sensing reaction than HP for the very...
      Expertly crafted from superior materialsProvides exceptional reliability
      $474.91 - $518.98
    • (0 reviews)
      # 1029100490
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Detroit Truetrac™ Rear Differential by Eaton®. Location: Rear. The Detroit Truetrac is a helical-gear style performance differential that maximizes wheel traction and enhances driving and...
      Helical-style pinion gearsLimited-slip operation
      $466.09 - $512.73
    • (0 reviews)
      # 503416444
      Oldsmobile Ninety-Eight with Open Differential 1981, Lock Right Locker by Powertrax®. Powertrax Lock-Right performance lockers’ straight-line performance is equal to a solid spool axle, yet they automatically unlock during turns. When...
      Brute Force Devices For Rugged ApplicationsReplacement Of Differential Case Not Required
      $336.26 - $406.60
    • (0 reviews)
      # 503420017
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Street Gear Ring and Pinion Gear Set by Richmond®. Richmond Gear ring and pinions are perfect for any vehicle where performance and durability matters. Made from first-run steel, never recycled...
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $221.45 - $279.10
    • (0 reviews)
      # 978085884
      Oldsmobile Ninety-Eight With 2.73 and Up Gear Ratio With Front GM 8.5" (10 Bolt) Series Axle / With Rear GM 8.5" (10 Bolt) Series Axle 1981, Differential Locker by OX Off Road®. All OX lockers use a completely mechanical locking system...
      Easy clean cabin friendly installation with no setup adjustmentsStandard system uses no electric for a higher level of dependability
      $859.00 - $994.00
    • (0 reviews)
      # mpn4515290647
      Oldsmobile Ninety-Eight With GM 7.5" Series Axle With 26 Shaft Spline 1981, 26-Spline Mini Spool by AllStar Performance®. Mini spool assemblies replace the OE side and spider gears in open style carriers to provide equal tractionto both...
      Precise manufacturing and high-grade materialsExpertly Crafted from the highest grade materials
      $93.99
    • (0 reviews)
      # 990430895
      Oldsmobile Ninety-Eight 1981, Ring and Pinion Gear Set by AllStar Performance®. Quality differential components are suitable for race, street and off-road use. Lapped in matched sets for quiet operation. This top-grade product is...
      Precise manufacturing and high-grade materialsExpertly Crafted from the highest grade materials
      $144.99
    • (0 reviews)
      # mpn4517168046
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle 1981, Rear Differential Master Overhaul Kit by Spicer®. Location: Rear. Genuine Spicer overhaul kit include all the latest production upgrades, so the parts you’re installing are as...
      Save Money: Buying components separately can be costly and cumbersomeSave Downtime: Be ready to perform a repair or overhaul as you need it
      $171.26
    • (0 reviews)
      # mpn4517168081
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle 1981, Rear Differential Standard Bearing Kit by Spicer®. Location: Rear. Remember - not all bearings are created equal. Choose Spicer axle bearing kits for just the right repair. Each kit...
      Highest quality mix of bearings, cups, and cones for performance you can count onPremium oil seals to keep lube in and dust and road grime out
      $130.86
    • (0 reviews)
      # 503402184
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Differential Bearing Kit by Motive Gear®. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of company products undergo...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $72.92 - $103.58
    • (0 reviews)
      # 503662322
      Oldsmobile Ninety-Eight 1981, Differential Carrier Gear Kit by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium differential...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $89.77 - $108.20
    • (0 reviews)
      # 503599528
      Oldsmobile Ninety-Eight 1981, Differential Gear Installation Kit by Motive Gear®. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of company products undergo...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $51.56 - $67.90
    • (0 reviews)
      # 503551192
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Differential Master Bearing Kit by Motive Gear®. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of company products...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $90.49 - $108.26
    • (0 reviews)
      # 503347527
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle with 10 Bolt 1981, Differential Pinion Bearing Kit by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $46.56 - $59.74
    • (0 reviews)
      # 503471985
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Differential Super Bearing Kit by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $113.17 - $125.76
    • (0 reviews)
      # 503617383
      Oldsmobile Ninety-Eight with 10 Bolt with Open Differential 1981, Mini Spool by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $80.99 - $81.49
    • (0 reviews)
      # 503542380
      Oldsmobile Ninety-Eight with 8.5" Series Axle with 10 Bolt 1981, Spool by Motive Gear®. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of company products...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $148.35 - $149.79
    • (0 reviews)
      # mpn4517168652
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle with 10 Bolt 1981, Differential Gear Installation Kit by Richmond®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and...
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $27.10
    • (0 reviews)
      # 503376006
      Oldsmobile Ninety-Eight 1981, Differential Mega Bearing Kit by Richmond®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium differential component...
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $157.24
    • (0 reviews)
      # 503695311
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle with 10 Bolt 1981, Differential Spool Bearing Kit by Richmond®. Richmond Gear Differential Installation Kits are a must have when overhauling an axle or replacing a ring & pinion set....
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $34.03 - $50.31
    • (0 reviews)
      # 503619432
      Oldsmobile Ninety-Eight with Open Differential 1981, Mini Spool by Richmond®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium differential...
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $100.35
    • (0 reviews)
      # 503687226
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle with 10 Bolt with C-Clip Eliminator Kit with 45 Degree Pressure Angle Axles 1981, Rear Spool by Richmond®. Location: Rear. Dominate the track or hit the trails with confidence by fine...
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $195.90 - $202.35
    • (0 reviews)
      # mpn4517170293
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle 1981, Rear Differential Master Overhaul Kit by Alloy USA®. Location: Rear. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and...
      Enables you to keep your engine in the powerband for more giddy-up and high speedAllows for getting superior traction on just about any brutal terrain
      $179.48
    • (0 reviews)
      # 990453118
      Oldsmobile Ninety-Eight 1981, Cross Pin by AllStar Performance®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....
      Precise manufacturing and high-grade materialsExpertly Crafted from the highest grade materials
      $18.99
    • (0 reviews)
      # 1016976702
      Oldsmobile Ninety-Eight 1981, Ring and Pinion Installation Bearing Kit by AllStar Performance®. Kit contain all the hard-to-find individual parts for a quick, trouble-free installation. Kits Include: Pinion and side (carrier) bearings,...
      Precise manufacturing and high-grade materialsExpertly Crafted from the highest grade materials
      $97.99 - $99.99
    • (0 reviews)
      # 1029097553
      Oldsmobile Ninety-Eight 1981, Differential Carrier Shim Kit by Motive Gear®. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of company products undergo rigid...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $18.21 - $24.23
    • (0 reviews)
      # 503627185
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Differential Crush Sleeve by Motive Gear®. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of company products...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $2.59 - $2.73
    • (0 reviews)
      # mpn4517167740
      Oldsmobile Ninety-Eight with Chrysler 7.25" Series Axle / with Chrysler 8" Series Axle / with Chrysler 8.25" Series Axle / with Chrysler 8.375" Series Axle / with Chrysler 9.25" Series Axle / with GM 7.2" Series Axle / with GM 7.5"...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $3.99
    • (0 reviews)
      # 503512277
      Oldsmobile Ninety-Eight 1981, Differential Pinion Seal by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium differential component...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $2.65 - $2.94
    • (0 reviews)
      # mpn4517168484
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle 1981, Differential Pinion Shaft by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $18.34
    • (0 reviews)
      # 503675192
      Oldsmobile Ninety-Eight 1981, Differential Pinion Shim Pack by Motive Gear®. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of company products undergo rigid...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $9.93 - $12.54
    • (0 reviews)
      # mpn4517167735
      Oldsmobile Ninety-Eight with Chrysler 9.25" Series Axle / with GM 7.5" Series Axle / with GM 7.75" Series Axle / with GM 7.625" Series Axle / with GM 8" Series Axle / with GM 8.2" Series Axle / with GM 8.5" Series Axle / with GM 8.625"...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $2.79
    • (0 reviews)
      # mpn4517166247
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle 1981, Differential Ring Gear Spacer by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this...
      Enables you to keep your engine in the powerband for more giddy-up and high speedAllows for getting superior traction on just about any brutal terrain
      $48.75
    • (0 reviews)
      # 503518228
      Oldsmobile Ninety-Eight with 10 Bolt 1981, Rear Differential Spring Retainer Service Kit by Auburn Gear®. Location: Rear. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and...
      Enables you to keep your engine in the powerband for more giddy-up and high speedAllows for getting superior traction on just about any brutal terrain
      $104.28 - $107.22
    • (0 reviews)
      # mpn4517169981
      Oldsmobile Ninety-Eight with GM 8.5" Series Axle 1981, Differential Pinion Shaft by Powertrax®. These hardened cross shafts are specifically designed for use with your Powertrax Lock Right locker. Powertrax Grip-Lok, Lock-Right Lockers...
      High quality at an affordable priceExpertly made from premium materials
      $23.99
    • (0 reviews)
      # 503486067
      Oldsmobile Ninety-Eight 1981, Differential Bearing Kit by Richmond®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium differential component that...
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $140.76
    • (0 reviews)
      # 503510351
      Oldsmobile Ninety-Eight 1981, Differential Pinion Shaft by Richmond®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium differential component that...
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $15.75 - $41.42
    • (0 reviews)
      # mpn4515290619
      Oldsmobile Ninety-Eight With GM 7.5" Series Axle / With GM 8.5" Series Axle 1981, Pinion Nuts by AllStar Performance®. Replace original, worn or damaged nuts each time a gear set is changed. Nut secures driveshaft yoke to pinion gear....
      Precise manufacturing and high-grade materialsExpertly Crafted from the highest grade materials
      $4.99
    • (0 reviews)
      # 990428881
      Oldsmobile Ninety-Eight 1981, Pinion Seal by AllStar Performance®. Replace leaking or damaged seals in most popular differentials. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion...
      Precise manufacturing and high-grade materialsExpertly Crafted from the highest grade materials
      $6.99
    • (0 reviews)
      # mpn4515294792
      Oldsmobile Ninety-Eight With GM 7.5" Series Axle 1981, Ring Gear Spacer by AllStar Performance®. Spacer allows installation of 3.23 and numerically higher ratio gear sets with standard thickness ring gears into 3.08 and numerically...
      Precise manufacturing and high-grade materialsExpertly Crafted from the highest grade materials
      $49.99
    • (0 reviews)
      # 531069940
      Oldsmobile Ninety-Eight 1981, Differential Crush Sleeve by Dorman®. A necessary item to replace when servicing the differential, Dorman’s Differential Crush Sleeve is durably built to retain optimal pressure when the pinion gear nut...
      Direct replacement for a proper fit every timeDesigned specifically for rear-wheel drive vehicles
      $2.96 - $3.14
    • (0 reviews)
      # mpn2412739
      Oldsmobile Ninety-Eight with 8.5" Ring Gear 1981, Rear Differential Bearing Kit by Dorman®. Dorman’s Differential Bearing Kit allows you to keep all the necessary components for installation of the Differential Ring and Pinion readily...
      Replacement eliminates driveline grinding and whining soundsRobust steel construction ensures durability for years of service
      $104.95
    • (0 reviews)
      # mpn2377088
      Oldsmobile Ninety-Eight with 7.5" Ring Gear / with 8.5" Ring Gear / with 8.75" Ring Gear 1981, Rear Differential Pinion Shaft Lock Bolt by Dorman®. Engineered from high-quality metal, Dorman’s Differential Pinion Shaft Lock Bolt...
      Replacement restores drivabilityDirect replacement for a proper fit
      $1.91
    • (0 reviews)
      # 531079350
      Oldsmobile Ninety-Eight with 8.5" Ring Gear 1981, Rear Differential Ring and Pinion by Dorman®. The gears of Dorman’s Differential Ring and Pinion are engineered to effectively transfer torque from the driveshaft to the axles. It's...
      Replacement eliminates driveline grinding and whining soundsDirect replacement for a proper fit
      $166.95 - $198.95
    • (0 reviews)
      # 531055647
      Oldsmobile Ninety-Eight 1981, Rear Axle Differential Bearing by National®. This bearing is manufactured from high quality steel and constructed utilizing state-of-the-art computer controlled heat treatment technology to ensure ultimate...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $7.78 - $11.44
    • (0 reviews)
      # mpn1074425
      Oldsmobile Ninety-Eight with 7.5" Ring Gear / with 8.5" Ring Gear with GMC Transmission 1981, Rear Axle Differential Bearing Race by National®. Cup Bore: 2.89". Cup Length: 0.653". This part is manufactured by one of the most trusted...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $4.16
    • (0 reviews)
      # 531150441
      Oldsmobile Ninety-Eight 1981, Rear Differential Pinion Bearing by National®. This bearing is manufactured from high quality steel and constructed utilizing state-of-the-art computer controlled heat treatment technology to ensure...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $7.08 - $15.08
    • (0 reviews)
      # 531085059
      Oldsmobile Ninety-Eight 1981, Rear Differential Pinion Race by National®. This part is manufactured by one of the most trusted names in the automotive industry to keep your vehicle perform optimally. It is built to the original...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $3.57 - $8.34
    • (0 reviews)
      # 531091888
      Oldsmobile Ninety-Eight with GMC Transmission 1981, Rear Outer Differential Pinion Repair Sleeve by National®. This part is manufactured by one of the most trusted names in the automotive industry to keep your vehicle perform optimally....
      National Redi-Sleeves are precision stainless steel wear sleeves designed to quickly repair damaged, grooved or worn shaftsStrong, durable stainless steel construction provides a corrosion-free sealing surface that surpasses most original shaft specifications
      $19.40 - $20.11
    • (0 reviews)
      # 531088281
      Oldsmobile Ninety-Eight 1981, Rear Outer Differential Pinion Seal by National®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this...
      National oil seals are recognized worldwide for their quality and reliable performance for every type of repair.Design Type: Spring Loaded; Multi-Lip
      $5.30 - $9.45





    1981 Oldsmobile Ninety-Eight Models
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