Trunnion Bearing Eliminator Kit
Anyone who wheels hard, rock crawls, or rock races has experienced blown up trunnion bearings, no matter what size bearings they are using, the bearing is always the point of failure. The Rock Assault Trunnion Bearing Eliminator Kit totally eliminates the bearings and replaces it with a solid king pin style pin that sits in a hardened bushing. The pin and bushing are made out of a material that is considered bearing quality because of its high carbon content, which gives it extreme hardness. To make sure these pins provide you with smooth steering we have added zerk grease fittings and machined the pins with grease passages and grooves so that they can easily be lubricated without any disassembly of the steering knuckle.
The Rock Assault Trunnion Bearing Eliminator Kit can be installed in a matter of hours and does not require you sending us your steering arms to be machined. You simply press out the pins in your (4) or (6) stud steering arms and press in the provided Trunnion Bearing Eliminator pins. The bottom pins have been pre installed in the bottom caps and simply drop in after the lower bushings have been installed. Since you will need to disassemble your knuckle assembly to complete this install a full knuckle service kit is provided so that you can replace all seals, gaskets, and shims.
Kit Includes:
- (4) Steering pins
- (4) Steering pin bushings
- (4) Zerk grease fittings
- (4) Zerk grease fittings
- (1) Knuckle service kit
NOTE: Due to various machining tolerances in the current steering arms on the market, some slight reaming may be required.
Contact our Tech Support Line for further information at 928-575-2174.
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Note: Images are for illustration purposes only. Images may not represent the product listed. Please contact customer service with any questions or concerns: 1-928-505-2501.
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Installation Notes:
1. Read all instructions completely and carefully before you begin.
2. Check to make sure the kit is complete and that no parts are missing(refer to
the Kit Contents List on the first page of these instructions). If anything is missing, please contact Trail-Gear at (559) 252-4950.
3. Park vehicle on a clean, dry, flat, level surface and block the tires so the
vehicle can not roll in either direction.
Tools Needed:
- ⅜” and ½” Drive Ratchets
- Sockets - 10mm, 12mm, 13mm, 14mm, 17mm, 19mm, 54mm
- Wrenches - 5/16”
- Hammer
- Jack and Jack Stands
- Press
- Side Cutters
- Needle Nose Pliers
- Knuckle Pull Scale
- Torque Wrench
- Grease gun with Zerk adapter
Installation Prep:
Chock rear tires, put front axle on jack stands and remove wheels and tires. Remove locking hub cap, outer Birfield snap ring
and locking hub body. Remove spindle nuts and remove hub from vehicle. Remove spindle from vehicle and remove
Birfield. Remove (8) 10mm head bolts from back of knuckle and disengage felt, rubber and metal ring from knuckle.
Remove tie-rod and drag link from steering arm. Remove nuts, washers, cone washers and steering arm from knuckle.
Remove lower bearing cap nuts and washers and remove cap from knuckle. Remove knuckle from vehicle.
1. Remove Races:
Remove races from the knuckle ball and clean the race pocket.
2. Install Bushings:
Install new bushings supplied in the Rock Assault™
Trunnion Bearing Eliminator Kit.
3. Install Bushings cont'd:
Ensure bushings are fully seated in pocket before continuing.
4. Install Bearing Cap:
Install shims and new bearing cap with pin in bottom of knuckle. As a good starting point, we recommend 60 thousandths.
5. Press out old Pin:
Press out original pin from steering arm.
6. Press in new Pin:
Press new pin into steering arm.
7. Grease and Install Knuckle:
Grease both pins and bushings before installation. Install knuckle on vehicle with shims and steering
arm.
8. Check Steering Pre-load:
Check steering preload (15-25 ft/lbs).
Reassembly:
Once preload is in specified range (15-25 ft/lbs), install axle and Birfield back in the vehicle. Install metal ring, rubber
ring, felt ring, and rock rings in the back of the knuckle. Install spindle on knuckle. Install hub and spindle nuts
making sure to bend tabs over on the locking ring. Install locking hub body. Install snap ring and locking hub cap.
Install tie-rod and drag link with cotter pins. Install tire and torque lug nuts. Repeat instructions for opposite side.
Trunnion eliminator 
