Log In Username. Login Forgot Your Password? Forgot Your Username? New Customer? Create an Account. My Account Orders list Wishlist Checkout. How to identify chevrolet gmc manual transmissions Use the following information to compare physical description of your Chevrolet or GMC manual transmission in order to identify what model transmission is in your vehicle.
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Information is provided for General Motors 3 speed , 4 speed , 5 speed and 6 speeds manual transmissions. Units from have enclosed driveline, otherwise known as a "torque tube". Those from may have electric overdrive. Some of units have larger gears with the same tooth count as the units. Fully synchronized with 30 tooth synchro rings. It has a four step cluster and all the gears are helical cut.
Has case casting number TX. Found in heavy duty applications. Fully synchronized with 36 tooth synchro rings. This is the only GM 3 speed with the same bearing front and rear. This transmission is found in performance applications.
Has R cluster gear. Found in heavy-duty applications. Casting number TXX or are on passenger side of case. They all have 9-bolt side covers and 36 tooth synchro rings. Reverse shift lever is located in the extension housing, along with main shaft reverse which is a straight cut gear. Some of the early units, found mostly in Corvettes, have a front nut like the Muncie M The side cover has 7 bolts and 2 shifter cams.
The synchro rings have 36 teeth and the unit has a 4-step cluster gear. Reverse gears are helical cut and are located in the extension housing. The side cover has 7 bolts and 3 shifter cams. The synchro rings have 30 teeth and the unit has a 5-step cluster gear. Reverse gears are straight cut and are located in the main transmission case. Shifter assembly is attached to the top of the extension housing where the two arms meet. The main case is open at both ends, the bell housing. There is an internal single-rail shift linkage with the shifter mounted on top of the extension housing.
Front and rear main bearings are ball type and the cluster gear has a shaft running through it, that is supported by loose needles. Case casting is number Front and rear main bearings are tapered. The cluster gear is solid and is supported on each end by cylindrical roller bearings located in the case. Case castings numbers are or The Isuzu logo is cast into the left side of the case.
Is not found in the Chevy LUV. It has a rectangular cast iron front bearing retainer and a 27 tooth rear output shaft. The front and rear countershaft bearings are both 25x62x Side-loaded with either aluminum or cast iron case and used in both gas and diesel applications. All of these units are 3 speeds with Overdrive.
Cast iron case with cast iron top cover. All gears on the countershaft are removable except for 1st. Early units have threads on the input shaft and do not have a front seal. Has GM casting numbers and one P. Cast iron case with cast iron top cover from and an aluminum top cover Non-synchronized 1st with brass synchro rings for 2nd-4th.
All main shaft gears ride on bushings pressed on the shaft. The only gears that are removable from the countershaft are 3rd and 4th. Since the differences between these three are internal, removing the transmission is necessary. Look for the manufacturer's tag, usually attached to a bolt on the transmission extension housing.
This tag identifies the manufacturer and the model transmission. Borg-Warner transmission model numbers begin with " Inspect the transmission for visual characteristics. According to Motivegear's Domestic Truck Transmission Identification Guide, Borg Warner T5 transmissions are all-aluminum, five-speed, top-loading transmissions with the bell housing not integral to the unit. The NV is a top-loading, cast-iron, heavy-duty transmission with an aluminum shift cover.
Weighing around pounds, the NV may have a warning label located on the case designating the use of Castrol Syntorque fluid only. Top-loading transmissions have an access plate bolted to the top of the unit. Since these differences are internal, including gear ratio and bearing specifics, the transmission has be torn down for proper identification.
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