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Greasable Rear Suspension Bushings

Fourwheeler Magazine's Project "Stinky" gained 50 points on the test ramp and about 1 ˝" 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.



Description:

These kits consist of grooved polyurethane bushings, drilled grade 8 bolts with grease zerks, and drilled DOM steel sleeves.  Each kit replaces spring and shackle bushings on factory and aftermarket rear springs.

Read the tech notes below to find which kit to use for your truck.

Part Number

Shackle Eye Size

Spring Eye Size

Application
Description
Price

GU38002-A
1-1/2"
1-1/2" at both ends

'69-'80 K5 Blazer/Jimmy

'69-'80 K10 pickup

'69-'80 1/2T Suburbans
(with 52" rear springs)

The safest bet for fitment is to measure your parts

Greasable rear spring and shackle bushing kit.

Include 12 bushings, 6 greasable bolts and sleeves with pinchlock nuts.

Covers the rear suspension on both sides.

$90/set
GU38002-B
1-1/2"
1-3/4" at the front and 1-1/2" at the back

'69-'80 K20 Pickups
(with 56" rear springs)

'69-'80 3/4T Suburbans
(with 56" rear springs)

'76-91 K30/V30 Pickup

The safest bet for fitment is to measure your parts

Greasable rear spring and shackle bushing kit.

Include 12 bushings, 6 greasable bolts and sleeves with pinchlock nuts.

Covers the rear suspension on both sides.

$90/set
GU38002-IFS
1-1/2"
43mm at both ends (~1.7")

'88-'91 3/4T Suburban (sometimes)

'88-91 V30 (sometimes)

The safest bet for fitment is to measure your parts

Greasable rear spring and shackle bushing kit.

Include 12 bushings, 6 greasable bolts and sleeves with pinchlock nuts.

Covers the rear suspension on both sides.

$90/set
GU38004
1-1/2"
Special bushings for #01-322 Superlift 8" rear springs

For GM trucks with 1-1/2" shackle eye and 8" Superlift rear springs

Greasable rear spring and shackle bushing kit.

Include 12 bushings, 6 greasable bolts and sleeves with pinchlock nuts.

Covers the rear suspension on both sides.

$105/set

Part Number

Shackle Eye Size

Spring Eye Size

Application
Description
Price

GU38003-A 1-3/8" 1-1/2" at both ends

'81-'88 K5 Blazer/Jimmy

'81-'87 K10 pickup

'81-'88 1/2T Suburbans
(with 52" rear springs)

The safest bet for fitment is to measure your parts

Greasable rear spring and shackle bushing kit.

Include 12 bushings, 6 greasable bolts and sleeves with pinchlock nuts.

Covers the rear suspension on both sides.

$90/set Buy Now

GU38003-B

1-3/8" 1-3/4" at the front and 1-1/2" at the back

'81-'88 1/2T Suburbans
(with 56" rear springs)

The safest bet for fitment is to measure your parts

Greasable rear spring and shackle bushing kit.

Include 12 bushings, 6 greasable bolts and sleeves with pinchlock nuts.

Covers the rear suspension on both sides

$90/set

 Buy Now

GU38003-IFS

1-3/8" 43mm at both ends (~1.7")

'89-'91 1/2T and
3/4T Suburbans
(sometimes)

'89-'91 K5 Blazer/Jimmy
(sometimes)

The safest bet for fitment is to measure your parts

Greasable rear spring and shackle bushing kit.

Include 12 bushings, 6 greasable bolts and sleeves with pinchlock nuts.

Covers the rear suspension on both sides.

$90/set

 Buy Now

Part Number

Shackle Eye Size

Spring Eye Size

Application
Description
Price

GU38005 1-3/8"
Special bushings for #01-322 Superlift 8" rear springs

For GM trucks with 1-3/8" shackle eye and 8" Superlift rear springs

Greasable rear spring and shackle bushing kit.

Include 12 bushings, 6 greasable bolts and sleeves with pinchlock nuts.

Covers the rear suspension on both sides.

$105/set Buy Now
GU38006 40mm 43mm at both ends (~1.7")

'88-'98 GM Pickups
(IFS body style)

'92-'99 Suburbans

'92-'99 Tahoe/Blazer
(IFS body style)

The safest bet for fitment is to measure your parts

Greasable rear spring and shackle bushing kit.

Include 12 bushings, 6 greasable bolts and sleeves with pinchlock nuts.

Covers the rear suspension on both sides.

$90/set Buy Now


 

Part Number

Spring Eye Size

Application
Description
Price

GU38001-A
1-1/2" at both ends

'69-'88 K5 Blazer and
1/2T Suburbans
(with 52" rear springs)

'69-'87 K10 Pickup

'69-'87 K20 Pickup
(with 52" rear springs)

The safest bet for fitment is to measure your parts

Greasable rear spring bushing kit.

Include 8 bushings, 4 greasable bolts and sleeves with pinchlock nuts.

Covers the rear springs (no shackle bushings) on both sides.

$60
GU38001-B
1-3/4" and
1-1/2"

'69-'87 K20 Pickups
(with 56" rear springs)

'69-'88 3/4T Suburbans
(with 56" rear springs)

'76-91 K30/V30 Pickup

The safest bet for fitment is to measure your parts

Greasable rear spring bushing kit.

Include 8 bushings, 4 greasable bolts and sleeves with pinchlock nuts.

Covers the rear springs (no shackle bushings) on both sides.

$60
GU38001-C
1-3/4" at both ends

Fits uncommon 56" rear springs with
1-3/4" eyes at both ends

The safest bet for fitment is to measure your parts

Greasable rear spring bushing kit.

Include 8 bushings, 4 greasable bolts and sleeves with pinchlock nuts.

Covers the rear springs (no shackle bushings) on both sides.

$60
 

Part Number

Spring Eye Size

Application
Description
Price

GU38001-IFS
43mm at both ends (~1.7")

'88-'98 GM Pickups
(IFS body style)

'92-'99 Suburbans

'92-'99 Tahoe/Blazer
(IFS body style)

The safest bet for fitment is to measure your parts

Greasable rear spring bushing kit.

Include 8 bushings, 4 greasable bolts and sleeves with pinchlock nuts.

Covers the rear springs (no shackle bushings) on both sides.

$60
GU38001-SL
Special bushings for
#01-322 Superlift 8" rear springs

For GM trucks with 8" Superlift rear springs

Greasable rear spring bushing kit.

Include 8 bushings, 4 greasable bolts and sleeves with pinchlock nuts.

Covers the rear springs (no shackle bushings) on both sides.

$75


 

Part Number

Shackle Eye Size

Application
Description
Price

GU38007
1-3/8"

'81-'91 K5 Blazer/Jimmy

'81-'87 K10 pickup

'81-'91 1/2T Suburbans
(with 52" rear springs)

Greasable rear shackle bushing kit.

Include 4 bushings, 2 greasable bolts and sleeves with pinchlock nuts.

Covers the rear springs (no spring bushings) on both sides.

$30
GU38008
1-1/2"

'69-'87 K20 Pickups

'69-'91 3/4T Suburbans

'76-91 K30/V30 Pickup

Greasable rear shackle bushing kit.

Include 4 bushings, 2 greasable bolts and sleeves with pinchlock nuts.

Covers the rear springs (no spring bushings) on both sides.

$30
GU38009
40mm

'88-'98 GM Pickups
(IFS body style)

'92-'99 Suburbans

'92-'99 Tahoe/Blazer
(IFS body style)

Greasable rear shackle bushing kit.

Include 4 bushings, 2 greasable bolts and sleeves with pinchlock nuts.

Covers the rear springs (no spring bushings) on both sides.

$30


Shackle bushings 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.

The factory rubber bushing consists of an inner steel sleeve, the rubber and a thin outer steel sleeve. The urethane bushings fit directly against the leaf spring so all 3 components of the factory bushing must be removed. There are several methods to removing factory rubber bushings.  The safest is to use a small diameter drill bit to drill out the rubber around the inner sleeve until it is loose enough to be driven out.  After it is out, the rest of the rubber can be "chunked" out with a chisel or screwdriver and the outer sleeve split and driven out. Install the new poly bushings with plenty of grease or anti-seize on the outside and inside.  They should be a snug fit but shouldn’t need to be pressed in.

Choose the category you would like more information on.

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