NO 2ND,4TH, OR REVERSE GEAR SUN GEAR SHELL/HUB BROKEN

MODELS: LIGHT DUTY TRUCKS WITH THM 700-R4 TRANSMISSION

When servicing any THM 700-R4 transmission for a condition of no 2nd, 4th, or reverse gears, inspect the reaction sun gear shell for a possible broken hub or stripped spline. See Figure No. 1.

If the reaction sun gear shell hub or spline area is broken or stripped, replace the sun gear shell with part number 8642203. Also, during reassembly be certain the reaction sun gear snap ring is properly located and the transmission end play is correct.

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.