HARSH UPSHIFTS CABLE REROUTE AND ADJUSTMENT

HARSH THM 200-4R TRANSMISSION UPSHIFTS - 1982 AND 1983 C-CARS

Some 1982 and 1983 C-cars, built prior to B.C. 113032, equipped with HT4100 engines and THM 200-4R transmissions may experience delayed and/or harsher than normal transmission upshifts (especially the 1-2). This condition may be caused by a misrouted transmission TV cable that results in an incorrect adjustment between the cable actuating lever on the throttle linkage and the TV link in the transmission.

When diagnosing vehicles exhibiting this condition, inspect the TV cable housing at the locator clip for any indication of the housing having been moved 10-15mm (3/4 to 1") from the original swaged mark caused by the clip (refer to Figure 1, View A). If the cable has been moved from its original position, it will be necessary to reroute the cable to its correct position prior to adjustment of the TV cable. Replacement of the cable assembly (P/N 1623543) is necessary only if the cable binds or sticks because of being kinked in the locator clip area.

The cable should be routed around the oil pressure switch wiring harness, HEI distributor, AIR pipes, and the manifold vacuum pipes as shown in Figure 1.

For warranty purposes, to reroute the TV cable, use labor Operation Number T6064 at .4 hour. If the cable is replaced, use K6200 at .5 hour.

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.