NO 4TH GEAR/BURNED BAND 700-R4 PAN GASKET/RTV BLOCK OIL HOLE

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.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.