GM Seat Jacker Installation Instructions 1996 - 2025 Chevy Express
Installation Instructions
Seat Jacker Installation Instructions
Important Notes
- Repeat these steps for both the front and rear of the seat.
- If installing Seat Jackers on both the front and rear of the seat, the larger side of every Seat Jacker must face forward.
- Seat Jackers are sloped. The larger side always faces the front of the vehicle.
- To help prevent cross-threading, verify each bolt and threaded hole before installation by threading the applicable bolt into the corresponding hole by hand.
- Do not force a bolt if it does not thread smoothly.
Step 1 — Remove the Factory Bolts
- Remove both front factory seat bolts that attach the seat to the seat base.
- Loosen the two rear seat bolts, but do not remove them.
- Save the factory nuts. You will reuse them with the provided hardware.
Step 2 — Lift the Seat
Lift the front of the seat by either:
- Pushing backward on the headrest, or
- Having a helper pull upward on the seat from the back seat.
Lift the seat enough to access the front mounting points.
Step 3 — Choose Your Lift Height
1/2" Lift — One Seat Jacker Shim
- Use the Seat Jacker with the threaded hole and “Seat Jackers” engraving.
- Place one Seat Jacker under each front seat rail, between the seat rail and the seat base.
- Make sure the larger side of the Seat Jacker faces forward.
- The Long Slotted Seat Jacker is for the optional MMP. Do not discard it.
Continue to Step 4.
1" Lift — Two Seat Jacker Shims
- Stack the two Seat Jacker shims together. The notches are designed to nest together.
- Place the stacked Seat Jackers under each front seat rail, between the seat rail and the seat base.
- The Seat Jacker with the threaded hole and “Seat Jackers” engraving must be on top.
- Make sure the larger side of the Seat Jacker faces forward.
Continue to Step 4.
Step 4 — Install the Provided Hardware
Using the provided 60mm Allen-head bolt and washer:
- Insert the bolt through the seat rail.
- Continue through the Seat Jacker(s).
- Thread the bolt into the seat base.
- Reinstall the factory nut onto the bottom of the bolt.
Start the bolt by hand and make sure it threads smoothly before tightening.
IMPORTANT — SEAT RAIL ALIGNMENT
If the seat rail holes do not line up:
- Lift the seat approximately 1/4".
- Start the bolt by hand and thread it a couple of turns.
- If necessary, adjust the seat rails one at a time until everything lines up.
- Confirm that the rear seat bolts are loose enough to allow the seat to move into alignment.
Never force the bolt or cross-thread the hardware.
Once everything is properly aligned, secure the bolts using the factory nuts.
Step 5 — Torque All Seat Bolts
Once the seat is fully aligned and all hardware is properly installed:
- Torque the two front bolts to 30 ft-lbs.
- Torque the two rear factory bolts to 30 ft-lbs.
Final Check
Before operating the vehicle, verify that:
- All four seat mounting bolts are properly torqued.
- The Seat Jackers are seated correctly.
- The larger side of the Seat Jackers faces forward.
- The seat is securely mounted and does not move independently of the vehicle.
- Check bolt torque at regular intervals and don’t forget to post a review. -