Fleetwood V8-368 6.0L VIN 9 FI (1982)
Clutch: Customer Interest
A/T - No Fourth Gear Operation, DTC 29/39 Set
Bulletin No. T
83-69
File In Group
7
Number
65
Date
April '83
NO FOURTH GEAR - THM 200-4R AND THM 325-4L
Figure 1 - OVERRUN CLUTCH
Some 1982 and 1983 Cadillacs equipped with THM 200-4R and THM 325-4L transmissions may experience a no fourth gear condition. (On DFI
equipped vehicles, codes 29 and/or 39 could also be present.) This condition can be caused by a broken hub weld on the overrun clutch housing (refer to
Figure 1).
When diagnosing vehicles exhibiting this condition, test drive the vehicle applying a light throttle in drive range to about 30-35 MPH (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 the Service Information 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
