Firebird V6-173 2.8L VIN L 2-bbl HP (1983)
Governor Pressure Switch: Customer Interest
A/T - Erratic or No Upshifts
Number 83-T-59
Section 7 Date 10/83
Subject:
ERRATIC OR NO UPSHIFTS - THM 700-R4 TRANSMISSION
In diagnosing any THM 700-R4 transmissions for erratic or no upshifts, the cause may be from a worn governor gear. The cause of the worn governor
gear may be from one or more of the following conditions:
1.
The output shaft to input carrier assembly snap ring came off.
2.
Metal scale on the output shaft gear.
3.
The governor dowel pin dimension may be incorrect.
4.
An incorrect governor gear may have been installed.
When servicing any THM 700-R4 transmission for an erratic or no upshift condition, refer to the following diagnosis chart.
Follow guidelines given in your Service Manual for servicing the transmission governor gear.
Figure 1
CONDITION
CAUSE
CORRECTION
1.
Governor gear is worn in an "Apple 1. Flash, scale or nicks on the output 1. Replace governor gear (part number Core" shape (see Figure
1).. shaft gear. 8642928). Wire brush output shaft
gear to remove scale of flash. Replace output shaft if nicked.
2.
Incorrect governor gear (THM 300C 2. Replace governor gear (part numtype). ber 8642928). DO NOT use THM
300C type as replacement.
Figure 2
Figure 3