Jeep Seat Slammers (2018+ Wrangler JL/JLU / 2018+ Gladiator JT) — Install Guide

Important Notes

• Read all instructions carefully before beginning installation.
• Disconnect the battery before removing the seat.
• Do not proceed with cutting or drilling unless you are 100% confident the Cutting/Drilling Fixture is installed correctly.
• When installing bolts, always start them by hand to help prevent cross-threading.
• Some models may have wires or wire raceways beneath the seat rails. Do not allow the seat rails to rest directly on wiring.

Step 1 — Remove the Seat

1. Park the vehicle on a level surface and set the parking brake.
2. Disconnect the battery terminals.
3. Remove any plastic trim pieces needed to access the front and rear seat base bolts.
4. Remove all four factory seat base bolts.
5. Lift the front of the seat to access the wiring underneath.
6. Unclip and disconnect any wiring between the vehicle and the seat.
7. Carefully remove the seat from the Jeep and place it upside down on a clean, flat surface.

Step 2 — Install the Cutting/Drilling Fixture

1. With the seat upside down, nest the Cutting/Drilling Fixture into the seat rail.
2. Position the fixture with the slotted hole facing the front of the seat and the angled portion facing up toward the back of the seat.
3. Bolt the fixture to the seat rail using one of the provided coarse-thread bolts and nut.
4. Use washers as needed to shim underneath the fixture so it lays flat.
5. Do not pinch the plastic seat rail guides when tightening the fixture.
6. Before tightening the M10 bolt and nut, push the Cutting/Drilling Fixture back toward the feet being cut off.

2-DOOR WRANGLER ONLY:
When installing the Cutting/Drilling Fixture on the outside leg, the holes being drilled will just miss the seat rail stop rivet. Ensure the holes are drilled on either side of the rail stop rivet. See installation photos.

POWER SEAT ONLY — 2024 AND NEWER:
Drill out the rivet holding the threaded rod in place. Once you begin drilling, the rivet may start spinning. Drill out as much as possible, then use a hammer and chisel or Dremel to remove the remaining material. Once the rivet is removed, attach the Cutting/Drilling Fixture. The fixture will align the next hole for drilling.

Step 3 — Verify the Fixture Before Cutting

1. Double-check that the Cutting/Drilling Fixture is installed correctly and the bolt is fully tightened.
2. IF YOU ARE NOT 100% CONFIDENT THAT THE FIXTURE IS INSTALLED CORRECTLY, DO NOT PROCEED.
3. Triple-check the fixture position before cutting the seat rail.

Step 4 — Cut and Drill the Seat Rails

1. Using a Sawzall with a metal-cutting blade or an angle grinder with a cutoff wheel, cut the seat leg along the angled portion of the Cutting/Drilling Fixture.
2. After the rear seat rail leg has been cut off, use a drill with a 3/8" drill bit to drill the two holes in the seat rail using the fixture as a guide.
3. Repeat Steps 2 through 4 on the opposite seat rail.
4. Use a file to remove any rough edges around the cut and drilled areas.
5. Apply spray paint to the exposed metal to protect the cut and drilled areas.

Step 5 — Install the Seat Slammer Blocks

1. The Seat Slammers can be installed while the seat is outside the Jeep or after the seat is reinstalled. DDI recommends installing them after placing the seat back into the Jeep because the seat is easier to fit through the door opening without the Slammers installed.
2. Install the Seat Slammer blocks to the bottom of the seat rails using the black M8 button-head bolts.
3. Use two M8 bolts per leg, with washers on top and flange nuts on the bottom.
4. The step/notch in each Seat Slammer should face down.
5. Loosely tighten the four M8 bolts to allow adjustment.
6. The M8 flange nuts are redundant, but DDI recommends installing them after the M8 button-head bolts have been torqued.

Step 6 — Option 2 Front Seat Jackers

OPTION 2 KIT ONLY

1. Install the .75" Front Seat Jackers with threaded holes at the front seat mounting points.
2. Use the provided M10 1.5 x 30mm black cap-head bolts to secure the Seat Jackers to the floor.
3. Align the Seat Jackers and torque the bolts to 35ft-lbs.

Step 7 — Option 1 Seat Drop Configuration

OPTION 1 KIT
This kit is adjustable and will drop the rear of your seat by 1", 1.25", or 1.5".

1" Drop

Place all provided shims under the Seat Slammer blocks, using 1" of shims under each Seat Slammer block.

1.25" Drop

1. Place one .25" shim under each front mounting point, between the seat rail and floor.
2. Use the factory bolts to loosely secure the front seat mounts.
3. Place one .25" shim and one .5" shim under each Seat Slammer block.
4. Use the provided black M10 45mm flange bolts to secure the Seat Slammers and shims to the floor.

1.5" Drop

1. Place one .25" shim under each front mounting point, between the seat rail and floor.
2. Use the factory bolts to loosely secure the front seat mounts.
3. Place the .5" shim under each Seat Slammer block.
4. Use the provided black M10 45mm flange bolts to secure the Seat Slammers and shims to the floor.

CAUTION: Some models have wires and wire raceways that may be pinched. If any portion of the seat rails rests on wiring, add a .25" shim to the front.

Step 8 — Option 2 Seat Drop Configuration

OPTION 2 KIT
This kit is adjustable and will drop the rear of the front seat by 1.25", 1.5", 1.75", or 2".

2" Drop

A 2" drop is achieved by installing the .75" Front Seat Jackers described in Step 6 along with the Seat Slammers.

Install the Front Seat Jackers

1. Slide the Front Seat Jackers with the threaded holes underneath the seat rails with the wings facing back.
2. Apply Blue Loctite to the provided M10 1.5 x 30mm black cap-head bolts.
3. Insert the bolts through the countersunk holes in the Front Seat Jackers and thread them into the floor.
4. These bolts install at a slight angle. Do not cross-thread them. If they do not align, realign the seat rails. You may need to gently wiggle the entire seat frame to align the bolts.
5. Align the Seat Jackers so the threaded holes are visible through the top of the seat rails.
6. Torque the front Seat Jacker bolts to 35ft-lbs.

Install the Seat Rail Bolts

1. Apply Blue Loctite to the provided M10 1.5 x 20mm black cap-head bolts.
2. Insert the bolts through each seat rail and thread them into the Seat Jacker threads.
3. Use the supplied washer with the seat mount.
4. These bolts install at a slight angle. Do not cross-thread the shorter bolts.
5. If the bolts do not align, loosen the front Seat Jacker bolts and realign the Seat Jackers.

Step 9 — Adjust Seat Position and Comfort

1. If the front seat rail holes do not line up, adjust the seat rails individually.
2. Sit in the seat and confirm the desired comfort and drop.
3. If the drop is too much, install the desired number of shims under the rear Seat Slammer blocks.
4. If more than .25" of rear shims are used, use the provided black M10 45mm flange bolts.

Step 10 — Reconnect Wiring and Final Torque

1. Reinstall all wiring that was disconnected underneath the seat.
2. Verify that no wiring is being pinched by the seat rails or hardware.
3. Torque all M10 bolts to 35ft-lbs.
4. Torque all M8 bolts to 25ft-lbs.

Final Check

• Verify all seat bolts are properly installed and torqued.
• Confirm the Seat Slammer blocks are securely installed.
• Confirm the seat rails are not resting on or pinching any wiring.
• Confirm the seat rails and Seat Slammers are properly aligned.
• Confirm the seat moves and adjusts properly before driving.
• Confirm all disconnected wiring has been properly reconnected.

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