Regal V6-231 3.8L Turbo VIN 8 4-bbl (1983)
Clutch: All Technical Service Bulletins
A/T - No Fourth Gear
Model Year:
1983
Bulletin No.: '83-91
File In Group:
70
Number:
9
Date:
April '83
SUBJECT:
NO FOURTH GEAR ON 1982 and '83 THM 200-4R TRANSMISSIONS
MODELS AFFECTED:
Some 1982 and 1983 THM 200-4R transmissions may experience a no fourth gear condition. The following diagnosis procedure will aid in determining
the cause for this condition.
Diagnosis Procedure Test drive the vehicle applying a light throttle in, drive range to about 30-35 m.p.h. (Third gear). Move the selector lever into
manual second and release the throttle. The transmission should downshift and coastdown overrun braking should occur.
1.
If coastdown overrun braking does occur, refer to the diagnosis procedure for no fourth gear in your service manual.
2.
If coastdown overrun braking does not occur, remove the transmission from the vehicle. Inspect the overrun clutch housing for a break in the hub
weld. If the hub weld is broken, the cause is due to misaligned pinions in the overdrive carrier.
FIGURE 1 - OVERRUN CLUTCH
FIGURE 2 - OVERDRIVE CARRIER
In all instances where the hub weld is broken on the overrun clutch housing, both the overrun clutch housing (Part number 8634107, Figure #1) and the
overdrive carrier (Part number 8634117, Figure #2) must be replaced.
