For more information concerning manual transmission identification, please refer toChapter 1of this manual.
Manual transmissions are officially identified by using the following descriptions:
The 4-speed (77.5mm) transmission is a fully synchronized unit with blocker ring synchronizers and a sliding mesh reverse gear. It is contained in an aluminum alloy case with an integral clutch housing, a center support and an extension housing, which houses some of the gears, bearings and shafts. The shift lever is mounted on top of the extension housing. This transmission is used with the early 2.8L 6-cylinder and the 1.9L 4-cylinder engines. The easiest way to identify the 77.5mm transmission is that the gear box and bellhousing are one casting.
The 4-speed (77mm) and 5-speed (77mm) model transmissions are fully synchronized units with blocker ring synchronizers and a sliding mesh reverse gear. They have the more familiar aluminum gear box type of transmission case that houses the various gears, bearings and shafts. The floor-mounted gearshift lever assembly is located on top of the extension housing. The ML2 (through 1991) model is used with 2.5L 4-cylinder engines; the ML3 (through 1991) model is used with the V6 engine. The easiest way to identify 77mm transmissions from the 77.5mm is that the gear box can be removed from the bellhousing.
For 1992-93 models, 2 transmissions were available. The MW1 (Borg-Warner T5 transmission) is used on 4-cylinder engines, while the MW2 (New Venture Gear 3500) manual transmission was available for 6-cylinder engine. Both of these transmissions are similar to the 5-speed 77mm model used earlier, except only the MW1 utilizes a detachable bellhousing. For the MW2, the bellhousing-to-engine bolts must be removed in order to remove the transmission assembly from the engine.