Transmission Shafts & Gears
- Original Equipment®Manual Transmission Synchronizer BandManual Transmission Synchronizer Band by Original Equipment®. Do you feel shaking or shuddering when you engage the clutch; hear grinding noise when you shift gears? Does your engine race without an increase in road speed? You're in...Perfect replacement for your damaged or worn out original partMade using high-grade materials for long-lasting dependability$42.79 - $48.26
- ATS Diesel Performance®Input ShaftInput Shaft by ATS Diesel Performance®. One of the weakest points of transmission is the stock input shaft. It is the first hard part to bring power into the transmission and transmit that power to the wheels. At increased power levels,...Unsurpassed reliabilityAble to handle high power applications$475.00 - $851.52
- ATS Diesel Performance®Transmission ShaftTransmission Shaft by ATS Diesel Performance®. The ATS Billet output shaft is part of the back bone of your transmission. It is the first hard part to bring power into the transmission and transmit that power to the wheels. With no...High quality 300M Billet SteelAble to Handle More Weight from Trailers and Bigger Tires$475.00 - $1,273.83
- Omix-ADA®Main ShaftMain Shaft by Omix-ADA®. The mainshaft supports the transmission gears and synchronizer assemblies and transfers the engine's power to the driveshaft or transfer case. It's generally a very durable part, but the splines, bearing...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$87.93 - $439.75
- Omix-ADA®Manual Transmission GearManual Transmission Gear by Omix-ADA®. Transmission gears take the engine's power and multiply it, apply it directly, or reduce it to turn the output shaft and the rear wheels, thereby keeping the engine in its torque curve while...Performs according to OEM specificationsMeets or exceeds OEM quality standards$32.50 - $488.62
- Omix-ADA®Replacement Transmission Gear ShaftReplacement Transmission Gear Shaft by Omix-ADA®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...Performs according to OEM specificationsMeets or exceeds OEM quality standards$11.39 - $32.50
- Omix-ADA®Transmission Input ShaftTransmission Input Shaft by Omix-ADA®. The shift shafts move back and forth in bores in the transmission case in response to the movement of the shift lever. Attached to the shift rails are the shift forks, which move the synchronizer...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$97.72 - $381.08
- ACDelco®GM Original Equipment™ Automatic Transmission Internal GearGM Original Equipment™ Automatic Transmission Internal Gear by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$21.01 - $440.60
- ACDelco®GM Original Equipment™ Automatic Transmission Sun GearGM Original Equipment™ Automatic Transmission Sun Gear by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$11.36 - $216.48
- ACDelco®GM Original Equipment™ Manual Transmission Gear Synchronizer HubGM Original Equipment™ Manual Transmission Gear Synchronizer Hub by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$67.99 - $68.30
- ACDelco®GM Original Equipment™ Manual Transmission SynchroGM Original Equipment™ Manual Transmission Synchro by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$231.46
- ACDelco®GM Original Equipment™ Manual Transmission SynchronizerGM Original Equipment™ Manual Transmission Synchronizer by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$58.68 - $310.97
- ACDelco®Genuine GM Parts™ Automatic Transmission Carrier Sun GearGenuine GM Parts™ Automatic Transmission Carrier Sun Gear by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$704.39 - $790.50
- ACDelco®Genuine GM Parts™ Automatic Transmission Internal GearGenuine GM Parts™ Automatic Transmission Internal Gear by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$44.70 - $172.71
- ACDelco®Genuine GM Parts™ Automatic Transmission Sun GearGenuine GM Parts™ Automatic Transmission Sun Gear by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle,...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$32.60 - $393.98
- ACDelco®Genuine GM Parts™ Manual Transmission Shift ForkGenuine GM Parts™ Manual Transmission Shift Fork by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle,...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$10.52 - $99.58
- ACDelco®Genuine GM Parts™ Manual Transmission SynchroGenuine GM Parts™ Manual Transmission Synchro by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$2.72 - $842.35
- Mopar®Automatic Transmission Internal GearAutomatic Transmission Internal Gear by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$159.55 - $369.85
- Mopar®Automatic Transmission Planetary GearAutomatic Transmission Planetary Gear by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$9.36 - $1,906.08
- Mopar®Automatic Transmission Planetary Gear AssemblyAutomatic Transmission Planetary Gear Assembly by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$45.28 - $1,323.41
- Mopar®Automatic Transmission Ring GearAutomatic Transmission Ring Gear by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$27.27 - $925.14
- Mopar®Manual Transmission GearManual Transmission Gear by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$31.30 - $921.59
- Mopar®Manual Transmission Shift ForkManual Transmission Shift Fork by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$2.56 - $1,719.87
- Mopar®Manual Transmission SynchroManual Transmission Synchro by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$9.75 - $2,695.32
- Mopar®Manual Transmission Synchro AssemblyManual Transmission Synchro Assembly by Mopar®. Designed utilizing the latest technology, this product by Mopar features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$31.30 - $1,016.02
- Genuine®Manual Transmission Shift ForkIf your transmission is in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store. On our website you'll find premium Genuine OE (Original...Designed to restore your vehicle’s transmissionGenuine OE replacement parts from the OE manufacturer$442.82
- ATP®Automatic Transmission Ring GearAutomatic Transmission Ring Gear by ATP®. When reliability and OE performance is a must, turn to this ATP product designed to provide a precise fit, OE quality, and function. Made of premium quality materials, it will easily restore...OE quality at an affordable priceOE fit and function$16.05 - $56.54
- Pioneer Automotive®Automatic Transmission Ring GearAutomatic Transmission Ring Gear by Pioneer Automotive®. Designed utilizing the latest technology, this product by Pioneer Automotive features premium quality and will perform better than advertised. Perfect for your vehicle and...Made to deliver reliable service for a long timeRugged construction to withstand harsh conditions$18.91 - $71.74
- Crown®Manual Trans GearManual Trans Gear by Crown®. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. You will surely get a real bang for the buck!Developed to improve your driving experienceConstructed to ensure ultimate operation$35.66 - $264.34
- Crown®Manual Trans Shift ForkManual Trans Shift Fork by Crown®. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. You will surely get a real bang for the buck!Developed to improve your driving experienceConstructed to ensure ultimate operation$29.47 - $107.09
The internal combustion engines that propel most cars and trucks develop peak torque and usable power within a relatively narrow rpm range, and their rpm limit is generally about 6000 rpm. If engine power alone was relied on for propulsion, acceleration from a standstill might be difficult or slow at best, and top speed would not only be limited but be at an rpm that would be detrimental to acceptable fuel economy and engine longevity. However, if engine power is directed through a transmission, the gears in the transmission will enable the engine to stay within the rpm range where it makes the best power and operates most efficiently. The gears in a transmission multiply engine torque for brisk acceleration and allow the vehicle to cruise at highway speeds at an rpm that provides best fuel economy and engine durability. If you’re in need of transmission gears, shafts and related components, we have the parts to restore shifting performance and transmission reliability.
A transmission employs several combinations of drive and driven gears to multiply engine torque. The number of rotations that the drive gear makes in relation to the driven gear is the gear ratio. The greatest amount of torque multiplication is needed when the vehicle accelerates from a standstill and this is achieved with gear ratios like 3:1 or 4:1, which are typical for 1st gear in a transmission, where the engine power supplied by the drive gear is applied to a larger driven gear. The driven gear rotates 1 time for every 3 or 4 revolutions of the engine crankshaft and drive gear. However, with such ratios torque is gained at the expense of speed, and more gears with different ratios are needed.
Once the vehicle is underway, less torque multiplication but greater vehicle speed is needed, hence the transmission drive and driven gears become closer in size and rotational speed. Second gear may be 2:1 or 3:1, where the crankshaft and drive gear rotate 2 or 3 times for every one revolution of the driven gear, and 3rd gear 1:1, which is direct drive. In direct drive the drive and driven gears are the same size and rotate at the same speed. This was typically “high” gear in older 3-speed and 4-speed transmissions, but this ratio could still force the engine to turn at a high rpm at highway speed, especially if the differential gear ratio was numerically high, reducing engine life and fuel economy. For this reason, modern transmissions have overdrive gears, with typical ratios of 0.85:1 to 0.65:1. In overdrive the driven gear spins faster than the drive gear, therefore the engine can operate at a lower rpm while the vehicle is at highway cruising speed.
While the gear principles are the same for automatic and manual transmissions, the way that gear ratios and gear changes are achieved are vastly different. A typical manual transmission has an input shaft, an output shaft, and a countershaft that rotate on ball bearings and roller bearings inside a cast aluminum case. The input and output shafts are in-line with one another, with the countershaft below them. The gears on the input/output shaft and countershaft are in constant mesh and rotate with one another, but the gears on the output shaft can rotate freely on the shaft until locked in position. Power flow is from the input shaft, through the countershaft to the locked gear and the output shaft.
Between gears on the output shaft are hubs that are splined to the shaft. Over the hub is a slider, or sleeve, that is connected to the shift linkage. When the driver selects a gear with the gearshift lever, the shift fork moves the slider toward the gear, locking it to the hub and output shaft. Each gear has a coned surface that works with the cone on a synchronizer ring. When the slider forces the synchronizer against the gear, it quickly brings the gear to the speed of the shaft to prevent gear clash. A clutch assembly, consisting of a flywheel, clutch disc, pressure plate and release bearing, is positioned between the engine and manual transmission. The clutch allows the engine to be disconnected from the transmission so the vehicle can come to a stop while in gear with the engine running, and so the driver can make gear changes.
Instead of a clutch, automatic transmissions have a fluid coupling device called a torque converter that transmits engine power to the transmission. It serves the same purpose as the clutch, in that it allows the engine to continue running when the vehicle is brought a stop while in gear, except the torque converter does this without requiring any action on the part of the driver. Automatic transmissions use planetary gearsets consisting of a sun gear, planet gears encased in a planetary pinion carrier, and a ring gear or internal gear. The sun gear is so-named because it’s in the center of the gearset, where it meshes with the planetary gears that revolve around it. Three or four planet gears are in a carrier and the ring gear surrounds the carrier. The planet gears are in constant mesh with the sun and ring gears. Most automatic transmissions have at least 2 planetary gearsets, combined in a compound gearset, to create the necessary gear ratios. To achieve the desired gear ratio, one planetary member is driven by the engine while another is held stationary, with the remaining member becoming the output. Clutches and bands, applied by hydraulic pressure, are the components used to control the planetary members.
Clutch packs consist of multiple, alternating steel and friction material-lined plates housed in a drum or the transmission case. The friction plates are internally splined to fit into grooves on a hub, while the steel plates have external splines that engage grooves in the drum or case. A piston compresses the plates, locking the hub and drum together when hydraulic fluid pressure is applied. Return springs disengage the piston when pressure is removed. Bands are friction material-lined flexible metal rings that surround and are used to stop rotating clutch drums. One end of the band is attached to the transmission case, while the other is engaged by a hydraulic piston in a servo. The servo contains a spring to disengage the band when hydraulic pressure is removed. Hydraulic pressure in the transmission is developed by a pump driven by the torque converter and then routed to the valve body. Valves or electric solenoids in the valve body direct hydraulic pressure to the appropriate bands or clutch packs to shift gears.
Worn or defective gears can cause noise and poor shifting performance. On a manual gearbox, shift through all the gears to determine which gear is faulty. Noise from worn gears and bearings will get louder as speed is increased and bearing noise will sound like a growl. Jumping out of gear can be caused by shift linkage that is worn or out of adjustment, worn synchronizers, worn shift forks, or a transmission or bell housing that is misaligned. Hard shifting can be caused by a worn or misadjusted clutch, worn or misadjusted shift linkage, and binding synchronizers. On an automatic transmission, noise in 1st or 2nd gear that disappears when the transmission shifts to higher gears may indicate a defective planetary gearset. When the transmission is disassembled, all gears should be checked for worn, chipped and broken teeth. On a manual transmission, inspect the synchronizer teeth on the gear for evidence of rounding and the cone area for nicks, gouges and roughness that would inhibit smooth engagement. Check the gear and shaft journal areas for scoring or other damage. On automatic transmissions, check bushings and thrust areas for damage and check the planet gears for looseness or binding in the carrier.
No matter what you’re working on, we have the transmission shafts & gears needed to restore proper transmission operation and vehicle performance or upgrade it. Replacements are manufactured according to original equipment specifications, so when repairs are completed you can count on the performance your vehicle was designed to deliver. In addition to input shafts, turbine shafts, output shafts, main shafts, countershafts, reverse gear shafts, cluster gears, planetary gears, and reverse idler gears, we offer thrust washers, spacers, snap rings, synchro sleeves, synchro hubs, synchro rings, synchro keys, synchro springs, shift forks, drive chains, sprockets, carriers, carrier hubs, differential pinion gears, differential ring gears, differential sun gears, center supports, clutch hubs, clutch housings, and much more.
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- Clutch Kits
- Automatic Transmission Oil Coolers
- Transmission Mounts
- Solenoids, Sensors, Switches, Control Units
- Transmission Filters
- Automatic Transmission Torque Converters
- Transmission Shifters
- Clutch Flywheels
- Pans, Drain Plugs, Filler Caps
- Clutch Hydraulics
- Seals & Gaskets
- Rebuild Kits
- Clutch Linkages
- Clutch Release Bearings
- Automatic Transmission Valve Bodies
- Bearings
- Automatic Transmission Flexplates
- Automatic Transmission Oil Pumps
- AT Bands & Clutches
- Automatic Transmission Governors, Modulators
- MT Assemblies
- Automatic Transmission Assemblies
- Clutch Pressure Plates
- Clutch Discs
- Transmission Wiring Harnesses
- Transmission Fluids, Oils & Additives