This cancels and replaces 83-127 dated February, 1984 which should be destroyed. This issue corrects the PROM part number from 1226657 to 1226647.
Some comments of TCC hunting, particularly when operating with the cruise control engaged, have been received on some of the above mentioned vehicles.
To correct this condition, two (2) new PROMS have been released to raise the TCC engagement speed.
1226647 1226439
1226648 1226441
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.