Century V6-181 3.0L (1983)
Valve Body: All Technical Service Bulletins
A/T - Firm 1-2 and 3-2 Shift Flare
Model Year 1983
Bulletin No. 83-157
File In Group 70
Number
27
Date
July '83
SUBJECT:
FIRM 1-2 AND 3-2 SHIFT FLARE
MODELS AFFECTED: 1983 THM 125C TRANSMISSION MODEL CB
The 1983 THM 125C CB model transmission may experience a firm 1-2 shift or 3-2 shift flare at times.
To correct this shift condition, a new control valve assembly went into production in early November, 1982. This new control valve assembly will soften
the 1-2 shift feel and eliminate the 3-2 shift flare.
When servicing any CB model THM 125C transmission for this shift condition built prior to transmission serial number CB-28411, use service package
part number 8643998. Refer to the following service procedure for installation.
SERVICE PROCEDURE
1.
Remove the control valve assembly from the transmission.
FIGURE 1
2.
(Figure #1) Remove the retaining pin from the 1-2 accumulator bore in the control valve assembly.
NOTICE:
Note the location of the hole in the 1-2 accumulator bushing where the retaining pin is located.
3.
Remove the 1-2 accumulator plug, valve, bushing, and spring and replace the valve, spring and bushing with parts contained in service package
#8643998. (1-2 accumulator spring will be orange in color and will be the smallest spring in diameter of the two springs contained in the package.)
4.
Install the retaining pin into the bore thru the top hole in the bushing. The pin must be flush or below the bottom face of the valve control
assembly.
5.
Remove the spring retaining sleeve from the 3-2 control valve bore in the valve body (Figure 1).
6.
Replace the 3-2 control valve spring with the spring contained in the service package. (The 3-2 control valve spring will be yellow in color and
larger in diameter than the 1-2 accumulator spring.)
