Manual Transmission/Transaxle: Description and Operation

Manual Transmission





MTX Transmission

The MTX-75 is a five speed synchronized unit. The MTX-75 has the following features:
^ Two-part aluminum housing
^ The input shaft has two tapered roller bearings. Input shaft end play is controlled by a selective shim located under the bearing cup.
^ The output shaft has two tapered roller bearings. Output shaft end play is controlled by a selective shim located under the bearing cup.
^ The differential has two tapered roller bearings. Differential end play is controlled by a selective shim located under the bearing cup.
^ All gears are bevel cut.
^ All gears, including reverse, turn on needle bearings.
^ Synchronized in all gears.
^ First and second gear are dual synchronized.
^ Single piece brass shift forks.

The input shaft, output shaft, and the differential assembly are assembled under preload. If the transmission is disassembled, a preload measurement must be taken.

Input and Output Shaft





General View of the Input and Output Shaft

Power Flow





First Gear

^ The input shaft drives the output shaft.
^ The first gear on the input shaft drives first gear on the output shaft.
^ The 1st and 2nd gear synchronizer is splined to the output shaft.
^ When the 1-2 synchronizer sleeve is shifted forward, first gear is locked to the output shaft.
^ The output shaft drives the differential ring gear.
^ The power flows through the side and pinion gears to the halfshafts.





Second Gear

^ The input shaft drives the output shaft.
^ The second gear on the input shaft drives second gear on the output shaft.
^ The 1st-2nd gear synchronizer is splined to the output shaft.
^ When the 1-2 synchronizer sleeve is shifted rearward, second gear is locked to the output shaft.
^ The output shaft drives the differential ring gear.
^ The power flows through the side and pinion gears to the halfshafts.





Third Gear

^ The input shaft drives the output shaft.
^ The third gear on the input shaft drives third gear on the output shaft.
^ The 3rd-4th gear synchronizer is splined to the input shaft.
^ When the 3-4 synchronizer sleeve is shifted forward, third gear is locked to the input shaft.
^ The output shaft drives the differential ring gear.
^ The power flows through the side and pinion gears to the halfshafts.





Fourth Gear

^ The input shaft drives the output shaft.
^ The fourth gear on the input shaft drives fourth gear on the output shaft.
^ The 3rd-4th gear synchronizer is splined to the input shaft.
^ When the 3-4-synchronizer sleeve is shifted rearward, fourth gear is locked to the input shaft.
^ The output shaft drives the differential ring gear.
^ The power flows through the side and pinion gears to the halfshafts.





Fifth Gear

^ The input shaft drives the output shaft.
^ The fifth gear on the input shaft drives fifth gear on the output shaft.
^ The 5th-reverse gear synchronizer is splined to the output shaft.
^ When the 5th-reverse gear synchronizer sleeve is shifted forward, fifth gear is locked to the output shaft.
^ The output shaft drives the differential ring gear.
^ The power flows through the side and pinion gears to the halfshafts.





Reverse Gear

^ The input shaft drives the reverse idler gear.
^ The reverse gear on the input shaft drives reverse gear on the output shaft.
^ The reverse gear synchronizer is splined to the output shaft.
^ When the reverse gear synchronizer sleeve is shifted rearward, reverse gear is locked to the output shaft. The reverse idler gear drives reverse gear on the input shaft, in a reverse direction.
^ The output shaft drives the differential ring gear.
^ The power flows through the side and pinion gears to the halfshafts.