Rear end id? please help.

[David Orum]

Hello

I have a 1999 Chevrolet Tahoe 2 dr, 2wd, vortec 350. i have made some improvements to the engine and now i want to add a locker to the rear end, BUT i am lost! i really cant identify the rear end in this thing.
does anybody know which rear end this is? the cover says Spicer on it.

Pic attached.

Thanks.

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[DerekTheGreat]

T'ain't a factree rear end, I can tell you that! Probably a rear out of a square body truck.

 

[b454rat]

WTF is that? Not a 10 or 12 bolt, not a 14 semi or full floater. Sorta looks like a Dana 44 but different bottom.

 

[GoToGuy]

Go to your glove box. All the option codes( RPO ) are there. Then google "GM rpo codes"
You can get a pdf download of all the 3 digit codes. The latest one i got is by ACDelco. Try that first. It helps if it is. Make, year, C or K, 1/2, 3/4 etc.

 

[geeeee89]

dana 70 possibly. They came in the early GMT400 1 ton trucks. Someone may have swapped it in for an axle upgrade

see if you can clean up the axle tubes and find anymore numbers. the part number on the diff cover is for the diff cover only. If it is a dana 70 from a GMT400 it should be the Dana 70-3HD

 

[stutaeng]

Interesante!

That doesn't like anything on here:
https://www.sierragear.com/differential-repair-help-topics/differential-identification/

Does kinda-sorta look like a Dana 44, 50, 70? but the bolts are different pattern. Is it an open differential? Is it a full floater? 6 lug or 8 lug?

Must of been something GM made for the International market? Or someone swapped a USSR axle in there? I'm just guessing here, LOL.

 

[David Orum]

Thx for all the fast replyes.

I cant id it by the rpo codes. because the sticker is missing in the glovebox.

Nothing to be found on the axle tubes. the tubes and housing are to rusty.

Its an open diff, what i can tell its a regular c-clip axle and its

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5 lug.

Im posting 2 more pics of some numbers found on the housing and on the ring gear if it helps someone id it for me?

 

[David Orum]

the really strange thing is that i have 2 trucks with this unknown rear axle in it.
the 1999 tahoe 2 door, and a 1997 c1500 shortbed

 

[stutaeng]

Well, the RPO code didn't say which axle you got anyways that I can remember. Pretty sure the only thing it had on the RPO was axle ratio.

I see a "DANA" on there, LOL. Maybe you can call them and they can tell you? Looking at that link again, maybe a Dana 30? The bolt pattern seems to match yours:

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[b454rat]

Definitely not a Dana 70. Dana 60 n 70 have the same or very close to the same cover. Since ur on the other side of the pond, could be a country specific thing or something. But since it says Dana, possibly a 40.