Please be advised that service PROMS have been released for the 1983 6000 and Phoenix cars to revise the TCC re-engage points to require significatly less throttle for re-engagement. This will eliminate the continual disengage/re-engage on grades, particularly when operating under cruise control. New PROMS are as follows:
1226647 replaces 1226439 for 2.84 axle 1226648 replaces 1226441 for 2.39 axle
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.