Component Tests and General Diagnostics
TRANSMISSION ALIGNMENT INSPECTION PROCEDUREIn some instances where excessive gear whine or high gear hop out, particularly at 50 mph (80 km/h) and up, are encountered, and after all other probable causes have been checked, an alignment check of the transmission and clutch housing may be helpful.
A special tool, on which a dial indicator is mounted, is necessary to check the transmission case rear bore alignment. This tool may be made from a new or good used clutch gear which has a good bearing surface on the crankshaft pilot end and at the front main bearing location.
The splines on the clutch gear shaft and the teeth on the clutch gear should be ground off so the shaft may be rotated in a clutch disc hub without interference when assembled in the vehicle. Weld a piece of 1/4 in. (6.3mm) rod in the mainshaft pilot bore long enough to extend out the case rear bore. Assemble a good bearing on the clutch gear shaft and secure it with the clutch gear bearing snap ring. Attach a suitable dial indicator to the rod.
1. Remove the transmission from the vehicle and completely disassemble, except for the reverse idler gear. In any case where the clutch gear pilot or pilot bearing is excessively loose or worn, the pilot bearing should be replaced before checking the transmission case rear bore alignment by the dial indicator method.
2. Carefully install the special tool with the dial indicator in the transmission case with the face of the indicator to the rear of the case and with the tracing finger contacting the I.D. of the case rear bore. Secure in place with a clutch gear bearing retainer.
3. Assemble the transmission case to the clutch housing and tighten the four transmission mounting bolts securely. Be sure to clean off any paint or other foreign material on the mating faces of the clutch housing and transmission as any foreign material on these faces will change alignment; also, check carefully for dings or burrs on these mating surfaces and remove carefully as necessary.
4. Dial indicate the transmission case rear bore and record the indicator readings in the 12, 3, 6 and 9 O'clock positions. It is best to start the reading at the 3, 6, 9 or 12 O'clock position closest to the point where the indicator plunger reaches its maximum outward travel. Set the dial indicator at "0" at this location and then record the 3, 6, 9 and 12 O'clock readings in rotation.
5. Install temporary slotted shims between the transmission case and the clutch housing in the quantities and at the bolt locations as necessary to bring misalignment at the transmission case rear bore to a maximum of 0.005 in indicator reading in either the vertical or horizontal direction. EXAMPLE: If the maximum indicator reading is at the 12 o'clock position, put shims on the two bottom bolts.
6. After the position and quantity of shims has been determined and recorded, the transmission case may be removed.
NOTE: The clutch housing should then be stamped, showing the position where shims are to be installed and the thickness of shims at each location.
7. Inspect the external clutching teeth of the clutch gear and second speed gear. Inspect the second and third speed clutch internal clutching teeth. If the teeth are worn or tapered, even slightly, the gears should be replaced. Reassemble the transmission.
8. Install the transmission assembly to the clutch housing, using the correct number of shims at the proper locations as previously determined. Shims are available by unit part number with each unit consisting of the following shims:
^ 4 - 0.002" shims, Identification - two corners cut off.
^ 2 - 0.005" shims, Identification - one corner cut off.
^ 1 - 0.010" shims, Identification - all corners square.
These special shims have a tab on one end for ease of installation. Do not slot the shims for the permanent installation.