How to Replace Wiper Transmission Arms 88-98 GMC Sierra K1500
Difficulty: Intermediate · About 90 min · Gmc Sierra K1500
Replace the windshield-wiper transmission on a 1988–1998 GMC Sierra K1500, marking blade positions and preserving the linkage alignment before testing the final sweep and park position.
Tools you will need
- Socket Extensions
- Flat Blade Screwdriver
- Phillips Head Screwdriver
- Painter's Tape
- 10mm Socket
- Ratchet
- 11mm Socket
Parts and supplies
- Windshield wiper transmission
Steps
- Mark and remove the wiper arms
Mark each blade's parked position on the windshield with painter's tape. Release the arm tabs with a flat screwdriver and lift both arms off their pivots.
- Remove the cowl and washer hose
Peel back the weatherstrip and remove the cowl screws and corner panels. Lift the cowl, disconnect the washer hose, and remove the panel from the truck.
- Remove the old wiper transmission
Loosen the linkage nuts and separate the arms from the motor stud. Remove the transmission mounting bolts and slide the assembly out of the cowl opening.
- Install the replacement transmission
Slide the new transmission into position and align its mounting holes. Install the bolts, reconnect the linkage arms to the motor stud, and tighten their nuts securely without binding the joints.
- Restore the cowl and weatherstrip
Reconnect the washer hose and set the cowl back into place. Reinstall the front and side screws, corner panels, and weatherstrip, checking that the panel seals against the windshield.
- Align the arms and test the wipers
Place the arms on their pivots at the tape marks and lower the blades gently onto the glass. Remove the tape, run the wipers through a full cycle, and confirm they park without contacting trim.
Check your vehicle’s repair manual for exact specifications and fit.