A/T - No Fourth Gear and/or Burned 2-4 Band Assembly
Number: 83-T-42Section: VIIc
Date: May, 1983
Subject: NO FOURTH GEAR AND/OR BURNED 2-4 BAND ASSEMBLY THM 700-R4 1982-83 ALL MODELS PASSENGER CAR AND TRUCK
THM 700-R4 TRANSMISSION:
TO: ALL CHEVROLET DEALERS
If a condition of no fourth gear and/or a burned 2-4 band assembly is encountered on any THM 700-R4 transmission, the cause may be a blocked 2-4 servo exhaust hole. See Figure 1.
The use of RTV silicone sealant and/or some aftermarket oil pan gaskets may block this 2-4 servo exhaust hole causing the above conditions.
When installing the oil pan on any THM 700-R4 transmission, be certain to use original equipment oil pan gaskets so the 2-4 servo exhaust hole is not blocked. Also, do not use RTV silicone sealant on any THM 700-R4 oil pan.