Bonneville V8-305 5.0L (1983)
Torque Converter Clutch: Customer Interest
A/T - Overheating When Driven in Fourth Gear
Number
83-I-153
Section 7 Date 09/83
Subject:
TRANSMISSION OVERHEATING - THM 700-R4
Some THM 700-R4 transmissions may exhibit an overheating condition when the vehicle is driven in fourth gear (overdrive) and the torque converter
clutch is not operational. Under these conditions, and especially under heavy load conditions, heat is generated in the torque converter that the
transmission cooler cannot cool adequately.
When diagnosing any THM 700-R4 transmission for an overheating condition the following conditions are some possible causes:
1.
The speedometer not working properly on ECM controlled units.
2.
A disconnected speedometer cable on ECM controlled units.
3.
The transmission electrical connector was disconnected.
4.
The torque converter clutch inoperative.
5.
An inoperative ECM unit.
6.
Refer to the appropriate torque converter diagnosis section in your Service Manual for additional information.
To prevent possible transmission overheating conditions, it is recommended that the THM 700-R4 transmission never be driven in fourth gear when the
torque converter clutch is not operational. If the torque converter clutch is not operational or even suspected to be not operational, the vehicle should be
driven in manual third range and the vehicle serviced.