Regal V8-307 5.0L (1986)
FIGURE 2 - CHECKING DRIVEN GEAR SHAFT FOR VOID OR HOLE
SERVICE ACTION
When servicing a 1986 or 1987 THM 200C transmission for a fluid leak around the speedometer driven gear fitting or cable, check the speedometer
driven gear shaft for a hole through the center of the shaft as follows: (Figure 2)
1.
Install a hand vacuum pump over the end of the gear (opposite gear teeth).
2.
Pump up 10 in.-hg. of vacuum.
3.
Gauge should stay at 10 in.-hg. for at least 30 seconds
-
If gear holds vacuum, inspect the seals in the adapter
-
If the gear does not hold vacuum, replace the gear*
*
NOTE: Check the new gear from parts stock as outlined before installing in transmission.
SERVICE PARTS INFORMATION
Refer to GM Service Parts Operations (GMSPO) Catalog for current speedometer gear based on transmission model and year.
