Rear spring bushings

[Paint guy]

I have my truck torn down in a winter redo. While at it I have decided it would be a great time to replace the rear spring bushings. So I go to the local parts store and was given a pair for the forward bushings that are 1.75" and a pair for the rear that are 1.5".

Here is my problem, my truck has 1.5" both forward and rear on the springs. So I go online to the AC Delco web site and even it says it should be the 1.75" and 1.5" respectively.

So other than putting the 1.5" on all four places which isn't a big deal, it makes me wonder, why does two local parts stores, and the AC Delco web site all call out differing sizes? My springs are in good shape, not damaged or anything.

Has anyone ever seen this? Should/would there be any concern of using the 1.5" on all four places?

 

[Arkansas_V8]

Dont think it matters as long you use the appropriate size.

Straight from ORD-

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.

 

[Paint guy]

Dont think it matters as long you use the appropriate size.

Straight from ORD-

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.

Thanks for that. Kind of what I suspected, was hoping for an acknowledgement of my thinking.

 

[Arkansas_V8]

Thanks for that. Kind of what I suspected, was hoping for an acknowledgement of my thinking.

Some aftermarket springs use different size bushings. Some stick to stock size. Weird world of bushings. Lol

 

[bucket]

In short, spring bushings are like a box of chocolates. You never know what your gonna get!