Auburn Gear® - Pro™ Rear Limited Slip Differential

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1980 Mercury Marquis
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Product Details

Mercury Marquis Base / Brougham 5.0L with 28 Spline with Ford 7.5" Series Axle with 10 Bolt 1980, Pro™ Rear Limited Slip Differential by Auburn Gear®. Turns your torque up another notch, offering an even higher bias ratio and faster sensing reaction than HP for the very best in controlled power transfer. Dominate the track or hit the trails with condidence by fine tuning your vehicle for neck-breaking speed and performance with this premium differential that delivers the ultimate in high strength and toughness. This rock-solid part is designed to provide the gearing that helps ensure your engine stays in the powerband for faster acceleration while providing maximum safety during tough driving conditions.


Axle Size: 7 1/2"
Ratio: All
Side Gear Spline: 28
Bolts: 10
Drivetrain: Rear Diff RWD
Bearing Cone: LM501349
Bearing Cup: LM501314
Carrier Material: Ductile Iron


  • Expertly crafted from superior materials
  • Provides exceptional reliability
  • Ensures everlasting service life
  • High quality

Auburn Gear®, LLС has been a premier supplier of quality gearboxes and performance differentials for the automotive, truck, bus, marine and some other industries for over 35 years. Headquartered in Indiana, Auburn Gear® produces a full range of products utilizing a one-stop in-house process including customization, end-to-end design capabilities and more. With several decades of industry experience, the company has earned world recognition resulted in the cooperation with National Fluid Power Association and Specialty Equipment Market Association.

Part Number:


Auburn Gear® - Differential InstallationAuburn Gear® - Differential Installation


Auburn Gear, LLC . Perfornance Differencial Limited Warrenty & Remedy

Limited Warranty:

Auburn Gear, LLC (AGI) is pleased to provide you (the original purchaser or user) with warranty coverage for your AGI aftermarket products. AGI warrants that its aftermarket products will be free from defects in materials and workmanship for a period of 1 year after the purchase date, or 12,000 miles of your normal use, whichever is less; and that the non-rebuildable components of its limited-slip differentials (the differential case and side gear-cone clutch assembly) will be free from defects in materials and workmanship for a period of 4 years from the purchase date.

Warranty Coverage:

For the covered product, AGI will, at its option, repair or replace the failing product. For covered product, AGI will, at its option, repair or replace the failing product or make a pro rata refund of the initial purchase price for the defective portion of the product.

Warranty Limitations:

There is no warranty of merchantability or fitness for a particular purpose, to the full extent disclaimer is permitted by law. In any event, any implied warranty that may arise by law is limited in duration to the term herein. The repair, replacement, or refund provided herein is exclusive and in lieu of all other remedies. AGI will have no liability to anyone for consequential, special, incidental, indirect, exemplary, or punitive damages of any kind whatsoever, including without limitation, property damage, or any other pecuniary damage, whether due to any defect in the products, breach of this agreement, non-performance, or any other reason. There are no third-party beneficiaries to these terms. You acknowledge these limitations, declare that they have been read and understood, and agree to be so bound.

Additional Consumer Rights:

Some States do not allow limitations on how long an implied warranty lasts, so such a limitation may not apply to you. Some States do not allow the exclusion or limitation of incidental or consequential damages, so that limitation or exclusion may not apply to you. This warranty gives you specific legal rights, and you may also have other rights that vary from State to State.

Warranty Exclusions:

This warranty does not cover aftermarket products that (a) have not been installed and maintained in accordance with AGI’s instructions; (b) have been used in off-road applications or uses other than regular automotive driving on standard roadways; (c) have not been used with proper lubricant and additive per installation and maintenance instructions; (d) have been subjected to misuse, modification, accident, intentional or negligent damage, fire, flood, weather, war, vandalism, unreasonable uses, acts of God, or other occurrences beyond AGI’s control; or (e) sustain damage from repairs or attempts to repair by anyone other than AGI or an authorized representative. You must comply with the installation and maintenance obligations of AGI’s instruction or owner’s manual.


If any provision or individual term herein is invalid or unenforceable under any applicable law, the provision or term will be ineffective to that extent and for the duration of the illegality, but the remaining provisions and terms will be unaffected.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

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Every Customer can leave a review about our service and the product that was purchased. In order to leave your review for your new product, please follow the link in the email you receive after completing your purchase. You can rate appearance, ease of installation, price/value and product quality.

Auburn Gear® - Pro™ Rear Limited Slip Differential
Auburn Gear® - Pro™ Rear Limited Slip Differential
Average Rating: 4.8 of 5
4.8 of 5
Works Great
Auburn Gear® 542048 - Pro™ Rear Limited Slip Differential
Had a little trouble with installation but I blame it mainly on me, the pinion shaft needed ground back just a little more than what it was out of the factory and I didn't realize it until I went to put in the axles and c-clips, so I had to tear it all apart again. I should have checked it before installation, my bad.
Posted by (Portland, IN) / 1999 Ford Ranger
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