Bonneville V6-231 3.8L (1984)
Figure 3 - Typical THM 200C Spacer Plate
Service Action:
(Figures 2 and 3)
To service a 1984 through mid 1986 (prior to Julian Date 016) THM 200C transmission equipped vehicle:
1.
Check engine idle speed and set to specifications.
2.
Check the rear differential back lash and repair if necessary.
3.
On a 1984 or 1985 "BH" model transmission only, remove the primary spring from the governor assembly (Figure 2).
Figure 3 - Typical THM 200C Spacer Plate
4.
On a 1984 or 1985 THM 200C transmission built prior to September 25, 1985 (Julian Date 268), remove the spacer plate and drill the 2nd and 3rd
clutch exhaust orifice out to 3.57 mm (9/64") (Figure 3). Using a 6.3 mm drill bit, hand chamfer both sides of the hole, slightly, to remove burrs
and rough edges.
5.
On a THM 200C transmission built prior to January 10, 1986, Julian Date 016, replace the rear internal gear and output shaft with the new pressed
on assembly. Refer to Service Notes in this bulletin.
6.
Upon reassembly of the transmission, reduce the transmission output shaft rear end play to .10 mm - .38 mm (.004 -.015 inches) by using a thicker
selective washer, if required. Do not let rear end play get lower than .004 inches. Transmission damage may result.
