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Home >> GMC >> 1983 >> Forward Control 5.7 M, Automatic, 400/M40 >> Repair and Diagnosis (Single Page) >> Transmission >> Manual Trans >> Removal & Installation - M/T >> Removal & Installation >> Transmission >> Removal (All Except "K" & "S" Series)

Removal (All Except "K" & "S" Series)

  1. On models with 117 MM 4-speed, remove attaching screws from shift lever boot retainer. Slide boot assembly up shift lever and remove lever. To remove shift lever, push down on collar and turn counterclockwise.
  2. On all models, raise and support vehicle under frame. Drain fluid from transmission. Disconnect speedometer cable at transmission. Remove shift controls from transmission (if not already removed). Remove parking brake lever, controls, and back-up switch wire as needed.
  3. Disconnect drive shaft at transmission and position support under transmission assembly. Disconnect exhaust pipes from exhaust manifolds as needed. Remove frame crossmember and flywheel inspection plate.
  4. On 117 MM 4-speed, remove top 2 transmission-to-clutch housing bolts and install guide pins. On all models, remove all transmission-to-clutch housing attaching bolts, slide transmission rearward until input shaft is clear of clutch hub and remove assembly from vehicle. Remove guide pins if used.
NOTE: Support clutch release bearing and support assembly when removing transmission main drive gear from flywheel housing. This will prevent release bearing from falling out of flywheel housing.