Rear end interchange?

User_name · Jun 13, 2022

Hey guys, my friend who is a fellow gmt400 owner busted his rear end. We are looking for a good used replacement. Could you tell me what other years and vehicles could interchange

Specs for his truck are as follows:
1998 chevrolet silverado
5.7 vortec/4l60e
3.73 gear ratio 10 bolt

stutaeng · Jun 13, 2022

Any GMT400 5 or 6 lug 10 bolt truck axle with a matching gear ratio would swap.

Or you can also swap/upgrade to a 14 bolt 9.5" from the 6 lug 2500 Light Duty trucks with a conversion U joint. Just keep it consistent if 2wd or 4x4 for either case.

User_name · Jun 13, 2022

I forgot to add IT IS 4X4

Caman96 · Jun 13, 2022

stutaeng said:
Any GMT400 5 or 6 lug 10 bolt truck axle with a matching gear ratio would swap.

Or you can also swap/upgrade to a 14 bolt 9.5" from the 6 lug 2500 Light Duty trucks with a conversion U joint. Just keep it consistent if 2wd or 4x4 for either case.

Did those 9 1/2 14 bolt SF’s only come with 3.73 or 4.10?

stutaeng · Jun 13, 2022

Caman96 said:
Did those 9 1/2 14 bolt SF’s only come with 3.73 or 4.10?

I thought so, but it was mentioned here sometime they were available in 3.42 too...

Caman96 · Jun 13, 2022

I’d like to come across one of those!

GMCTruck · Jun 13, 2022

The 6 lug 14 bolt SF rear ends are not only found in the light duty 2500. Many K1500 trucks will have them as well. (RPO F44). At least up here in Canada, 1/2 tons with the 14 bolt are very common.

Schurkey · Jun 13, 2022

The 8.5" "Ten bolt" should never have been installed in a full-size pickup. They're fine for small-block compact and intermediate cars.

It took me years to find a six-lug 9.5" axle for my '88 K1500 with 3.42 gears and G80. Even a 3.42 open differential axle assembly was uncommon. 3.73 was common, even more than 4.10.

Caman96 · Jun 13, 2022

Schurkey said:
The 8.5" "Ten bolt" should never have been installed in a full-size pickup. They're fine for small-block compact and intermediate cars.

It took me years to find a six-lug 9.5" axle for my '88 K1500 with 3.42 gears and G80. Even a 3.42 open differential axle assembly was uncommon. 3.73 was common, even more than 4.10.

There’s one on eBay right now.

88-99 Chevy GMC Truck 2500 Rear Axle Assembly 3.42 14 Bolt 6 Lug LSD | eBay

Find many great new & used options and get the best deals for 88-99 Chevy GMC Truck 2500 Rear Axle Assembly 3.42 14 Bolt 6 Lug LSD at the best online prices at eBay! Free shipping for many products!

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Caman96 · Jun 13, 2022

I’d be leery of spending $500/axle and $400/freight. You get it, it’s junk and now your responsible to send it back for another $400 plus $150 restocking fee. Seller may have a good thing going there -sell junk, get it back and make $150, then keep repeating process! :33:

Rear end interchange?

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88-99 Chevy GMC Truck 2500 Rear Axle Assembly 3.42 14 Bolt 6 Lug LSD | eBay

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