Full Size Cad RWD V8-350 5.7L DSL (1984)
Clutch: Customer Interest
A/T - No Gears or Slipping In All Ranges
Bulletin No. T
84-75
File In Group
7
Number
104
Date
May '84
SUBJECT:
NO GEARS OR SLIPPING IN ALL RANGES - THM 400
MODELS AFFECTED: 1984 LIMOUSINES AND COMMERCIAL CHASSIS
Some 1984 Limousines and Commercial Chassis equipped with THM 400 transmissions which were built between February 1, 1984, and March 31,
1984, may experience a loss of operation in all forward and reverse ranges or slipping in all ranges. Refer to the chart below for model and serial number
applications affected.
Trans.
Vehicle
Model
Serial Number Range
Limousine
AN
1790 to 2139
Commercial Chassis
AD
1230 to 1434
FIGURE 1 - REVERSE BOOST BUSHING
This condition may result from a mislocated forward clutch snap ring and/or some clutch seals positioned out of their seats due to a sticking reverse
boost valve in the reverse boost bushing. It is very important to visually inspect the reverse boost bushing which is located in the oil pump assembly for
possible mismachining of the inner diameter. Refer to Figure 1, Items "A" and "B", for examples.
If the reverse boost bushing is like letter "A", the bushing and valve must be replaced. Install service package P/N 8625902 which contains the
following:
1
-
Regulator Boost Valve Bushing
1
-
Regulator Boost Valve
