Fleetwood Brougham V8-252 4.1L (1985)
Valve Body: All Technical Service Bulletins
A/T - No Upshift After Full Throttle Detent Downshift
Bulletin No. T
86-34
File in Group
7
Number
131
Corp. Ref. No.
806 7203
Date
FEB. '86
SUBJECT:
NO UPSHIFT AFTER FULL THROTTLE DETENT DOWNSHIFT
MODELS AFFECTED: 1984-1985 BROUGHAM, 1984-1985 ELDORADO/SEVILLE EQUIPPED WITH GAS ENGINES
Some 1984-1985 Cadillacs equipped with gasoline engines and either a THM200-4R or THM325-4L automatic transmission may experience a no
upshift condition after a wide-open throttle (WOT) detent downshift. This condition is due to excessive hydraulic assist acting on the throttle valve (TV)
plunger and bushing. This assist is used to reduce throttle pedal effort. The no upshift condition can be intermittent and will normally be eliminated after
shutting the engine off. A revised Throttle Valve plunger and bushing P/N 8639937, which uses a larger plunger stem to reduce hydraulic assist, has been
reteased for service.
When servicing an automatic transmission for this condition, first verify the TV Cable condition, adjustment and routing as outlined in the appropriate
Service Information Manual. If no problem is found, install a service TV plunger and bushing assembly using the service procedure and parts
information listed below.
SERVICE INFORMATION
1.
Remove the transmission oil pan, remove all pan gasket or sealing material.
2.
Remove the TV cable from the TV linkage. Remove the TV linkage from the control valve body assembly. Do not remove the control valve
body assembly.
Figure 1 - Typical 200-4R Control Valve Assembly
Figure 2 - Typical 325-4L Control Valve Assembly
