W/O Overdrive Unit

1. Remove bolt and retainer securing speedometer pinion adapter in extension housing, then the adapter and pinion from housing.
2. Remove extension housing attaching bolts.
3. Slide 3rd-4th synchronizer sleeve slightly forward, slide reverse idler gear to center of shaft, then using a mallet, tap extension housing rearward. Slide extension housing and mainshaft assembly from case.
4. Remove snap ring retaining 3rd-4th synchronizer clutch gear and sleeve assembly, then slide assembly from mainshaft.
5. Slide 3rd speed gear and stop ring from mainshaft.

Fig. 3 Center bearing snap ring compression:

6. Compress snap ring retaining mainshaft ball bearing in extension housing and pull mainshaft assembly and bearing from extension housing.
7. Remove mainshaft bearing retaining snap ring. Remove bearing by installing steel plates on the 1st speed gear, then press or drive mainshaft through bearing. Use caution not to damage gear teeth.
8. Remove bearing, bearing retainer ring, speed gear and 1st speed stop ring from shaft.

Fig. 4 Clutch gear snap ring removal:

9. Remove 1st-2nd clutch gear and sleeve assembly snap ring, then slide assembly and the 2nd speed gear from shaft.

Fig. 5 Centergear endplay measurement:

10. Measure countershaft gear end-play by inserting a feeler gauge between thrust washer and gear. End-play should be 0.015-0.029. If not, install new thrust washers when reassembling transmission.