Greasable Rear Spring Bushing Kits for GM Trucks
We are working with a second generation Kevlar reinforced polyurethane bushing material that is proving to be another step stronger and more durable. At this time the new material is only available in the same grey color as our Kevlar tierod end boots. For more information on bushing color, click here.
See the product info tab for ordering details.
Fourwheeler Magazine's Project "Stinky" gained 50 points on the test ramp and about 1 ½" of rear shock travel just by replacing the shackle bushings. These work! Drilled and crossdrilled grade 8 bolts and sleeves and channeled bushings allow you to lube your poly bushings for better ride, less wear and eliminate bushing "squeak".
A often misunderstood fact is that factory rubber bushings offer less flexibility than aftermarket urethane. Most people have heard or read otherwise but rubber does not work as well in the real world. The reason is that the factory rubber bonds the inner sleeve to the outer sleeve and spring. Since they're bonded together, the inner sleeve can't twist relative to the spring. When you tighten your shackle and spring bolts the inner sleeve is locked solid to the vehicle so the suspension is limited by the rubbers inability to rotate. Urethane bushings on the other hand, can rotate freely around the inner sleeve and will not bind up the suspension.
These kits consist of grooved polyurethane bushings, drilled grade 8 bolts with grease zerks, and drilled DOM steel sleeves. Each kit replaces the bushings/sleeves/bolts at both ends of both springs.
Looking to add our Kevlar bushings to your leaf springs but don't know your spring eye ID? Here is a quick way to find out without pulling apart your truck.
Measure the OD of the spring eye,
in this case 2"
Then measure the thickness of the leaf 1/4" on this truck.
Now subtract 2 Xs the thickness from the spring eye OD
2 x .25 = .5
2" - .5" = 1.5"
So this spring needs 1.5" bushings.
*Make sure to do this on each spring eye because they can be different