A/T - Firm 1-2 and 3-2 Flare Shifts
Number 83-T-44 Section 7 Date 07/83Subject: FIRM 1-2 AND 3-2 FLARE SHIFTS ON THM 125C - 1983 THM 125C (MODELS CA, CB, AND CF)
1983 THM 125C CA, CB, and CF model transmissions may experience a firm 1-2 shift or 3-2 shift flare at times.
To correct these shift conditions 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.
A service package has been made available for servicing any CA, CB, or CF model THM 125C transmission for these shift conditions, built prior to transmission serial numbers CA-1360, CB-28411 and CF-2968.. Refer to the following service procedure:
SERVICE PROCEDURE
1. Remove the control valve assembly from the transmission.
2. Remove the retaining pin from the 1-2 accumulator bore in the control valve assembly (see illustration)..
NOTICE: Note the location of the hole in the 1-2 accumulator bushing that the retaining pin locates through.
3. Remove the 1-2 accumulator plug, valve, bushing, and spring. Replace the valve, spring and bushing with parts contained in service package (part number 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 through 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 (refer to illustration).
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.)
7. Replace the spring retaining sleeve into the valve body. The retaining sleeve must be flush or below the bottom face of the control valve assembly.
8. Install the control valve assembly onto the transmission following procedures outlined in the Service Manual.