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Old 03-13-2018, 11:04 AM   #1
SnS C10
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which front and rear diffs came on my suburban and will these fit?

Hey guys I was wondering what diffs came from the factory on my 86 2500 4x4 suburban? I found a set of diff covers local and was wondering if they would fit.
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Old 03-13-2018, 11:42 AM   #2
Jsfucttruck
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Re: which front and rear diffs came on my suburban and will these fit?

In 86 your 3/4 ton 4x4 would have a 8 lug, 10 bolt front axle and a semi-float 14 bolt from the factory.

Neither one of those is going to fit if you have factory axles.

Potentially, one of those(upper one) might fit if someone swapped a 14bff rear axle in.
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Old 03-18-2018, 01:26 PM   #3
cal30_sniper
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Re: which front and rear diffs came on my suburban and will these fit?

A lot of 3/4 ton burbs came with 14bolt full float axles. Just have to crawl underneath and see.
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Old 03-18-2018, 10:23 PM   #4
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Re: which front and rear diffs came on my suburban and will these fit?

I have a 78 k20 burb that came with a 14bff.

It was my understanding that 4x4 burbs after 81 did not come with 14bff or a BBC. K/V 20 series only came with semi float 14 axle with a sbc or diesel.

If it was a 2wd. You could get a 454 and a 14bff in one package.
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Old 03-19-2018, 02:07 AM   #5
Irish1941
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Re: which front and rear diffs came on my suburban and will these fit?

Quote:
Originally Posted by Jsfucttruck View Post
I have a 78 k20 burb that came with a 14bff.

It was my understanding that 4x4 burbs after 81 did not come with 14bff or a BBC. K/V 20 series only came with semi float 14 axle with a sbc or diesel.

If it was a 2wd. You could get a 454 and a 14bff in one package.
Truth right there.
Pull off the hubcap and if there is a big hub in middle of the axle, 14bolt full floater. No need to crawl under it.
If that is what you indeed have then somebody swapped it in there.
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Old 03-19-2018, 04:46 AM   #6
mongocanfly
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Re: which front and rear diffs came on my suburban and will these fit?

mine has 14b semi rear ..not a ff.....and a corp 10b front...mines 91
1st pic is semi
2nd pic is full
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