Band Apply Pin Selection Check
WARNING: This page does not describe the selected car, but rather 124 other vehicles, including the 1991 Chevrolet Pickup, 1991 Chevrolet Cab & Chassis, 1988 GMC Vandura Special, 1988 GMC Vandura, and 1988 GMC Value Van. However, it is still accessible from the selected car via links, so may be relevant.
- Position Band Apply Pin Selection Gauge (J-21370-6) on transmission case over rear servo bore. See Fig 1. Hex nut on side of gauge faces toward parking brake linkage. End of Gauge Pin (J-21370-5) with smaller diameter fits in servo pin bore.
- Secure gauge with 2 attaching screws. Tighten screws to 18 ft. lbs. (24 N.m). Ensure stepped gauge pin is free to move in both tool and servo pin bore. Stepped side of pin must face front of transmission case.
- Apply 25 ft. lbs. (34 N.m) of force to hex nut on side of gauge. This will cause lever on top of gauge to depress stepped gauge pin into servo pin bore, simulating actual operating conditions. Note relation of steps on gauge pin and machined surface on top of gauge.
- If gauge pin is even with top of gauge surface or above upper step of pin, use long pin.
- If gauge pin is between upper and lower steps, use medium pin.
- If gauge surface is even with or below step on gauge pin, use short pin.
- If new band apply pin is required, make note of pin size for reassembly reference. Remove selection gauge from transmission case.