Greasable Rear Spring Bushing Kits for GM Trucks

Greasable Rear Spring Bushing Kits for GM Trucks

Greasable 88-98 IFS Rear Spring and Shackle Bushing Kit - Kevlar

As low as $99.00
Availability: In stock
SKU
GU38006

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.

Shackle bushing size: Most '80 and older Chevy trucks use a 1-1/2" shackle bushing. Most '81-'87 1/2 ton Chevy trucks and '81-'91 1/2 ton Suburbans and Blazers used a 1-3/8" shackle bushing. Most '81-'87 3/4 ton Chevy trucks as well as '81-'91 3/4 ton Suburbans and K30's use 1-1/2" shackle bushings. Spring eye size: 52" rear springs came in '67-'87 1/2 ton GM trucks, '69-'91 Blazers, most 1/2 ton '67-'91 Suburbans and rarely in '73-87 3/4 ton pickups. Most use 1.5" bushings at each spring eye, but the '88-91 Blazers and Suburbans could have 1.5" or metric (~1.7") spring eyes. 56" rear springs came in the rear of all '76-'91 K30's, most '67-'87 K20's, most 3/4 ton Suburbans and rarely in 1/2 ton Suburbans. Most use a 1-3/4" bushing at the front and a 1-1/2" bushing at the back, but we have seen sets that had 1-3/4" eyes at both ends and metric (~1.7") eyes at both ends. If the eyes are different sizes, they should be 1-3/4" and 1-1/2", if they're the same size you'll need to measure. 64" springs from an '88 and newer GM trucks have become a popular swap. The '88-'98 springs use a 43mm metric spring bushing at each end. At this point we do not have bushings for '99 and newer springs. 8" Superlift rear springs use a unique bushing.