Rear end ID help please

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Rear end ID help please

Postby GermanMonza » Sun Dec 20, 2020 10:53 am

Hi folks, there's a guy selling a rear end but has no clue what car it came out of (but might be what I want)
He claims it's a posi because he can only turn the wheels in the same direction. Determined the gear ratio by counting rotations and says it's approx. 3.75:1
Wheel flange to wheel flange measures 59"
It has disk brakes with finned calipers and vented rotors.
He sent me some pictures of stamped codes but I could not find those anywhere.

Axle tube code:
MJ8 C 070122208
Diff cover: 67045 05
Cast No probably 40085659, but that's not for sure
There's a part number on a brake rotor, 15725778

I've googled around for several hours now, but couldn't come up with anything. So if you guys can help me out I'd be forever grateful.
I've asked him to take the diff cover off for pictures but he hasn't replied since.

Thanks for reading!
Raoul
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Re: Rear end ID help please

Postby Smiley » Sun Dec 20, 2020 10:04 pm

59” is a bit too wide for a Monza.
pics of the whole rear cover and housing tubes may help,
is it for a leaf spring or coil spring setup ?
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Re: Rear end ID help please

Postby GermanMonza » Mon Dec 21, 2020 3:50 am

Thanks Smiley,

I thought I might be able to use the guts, if it's a 3.73 with a locker and maybe fabricate something for the disk brakes. It looks like a 7.5" to me. But I read somewhere if it's from a 4WD S10 that wouldn't work (not sure what's the difference to the RWD).
Leaf setup.
Some more pictures:
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Re: Rear end ID help please

Postby Smiley » Mon Dec 21, 2020 4:11 am

4wd rear axles are wider
2wd are Monza width
90 and up S10 axles and carriers are 28 spline
82-88 S10 are 26 spline like Monza
S10 pinion gears use a different bearing than Monza 7.5
pinion can be used if machined down or with a conversion bearing
you can use a 28 spline carrier in a Monza housing but you will need
90 or newer 2WD S10 axles
probably not a lot of useable parts there for you
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Re: Rear end ID help please

Postby GermanMonza » Mon Dec 21, 2020 7:43 am

Thank you smiley, I thought I could use the carrier and locker in my housing with the conversion bearing.
Buy some 26 or 28 spline shafts, depending on what it is, and use the disk brake brackets and stuff to fabricate my own rear disk system.

I could buy a posi carrier from Auburn or whatever, but then I'd still have the 2.29 gearing and need 5 lug axle shafts anyway.

So I'm basically trying to find out what that rear end came out of and if I could use the carrier and pinion with the conversion bearing in my '77 Monza housing.

If everything fits, this would be the cheapest solution for me. Mind you I'm in Germany and S10 junkyard parts are almost impossible to come by. But I don't know if the only difference between 4WD and RWD Blazers/S10s is the width of if there is anything else to consider, or if the rear end I could buy here is from a Blazer/S10 at all.
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Re: Rear end ID help please

Postby Smiley » Mon Dec 21, 2020 1:52 pm

To confirm it is a posi pull the rear cover, count the teeth and get the numbers off the ring gear.
then look up the ring gear numbers to confirm it is a GM 7.5-7.6
the straight axle tubes rule out an 8.5
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Re: Rear end ID help please

Postby GermanMonza » Mon Dec 21, 2020 3:11 pm

I specifically asked for pictures of those, thank you for your help Smiley, I really appreciate it
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Re: Rear end ID help please

Postby GermanMonza » Mon Dec 21, 2020 6:21 pm

Alright, some more pictures. Can anybody tell me what type of locker this is? Haven't seen one like it before..

Edit: the code on the ring gear is H-02/24/05-B, I'll see what I can find but if you guys have any resources for it, it would help a lot.
Thank you so much!
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Re: Rear end ID help please

Postby Smiley » Mon Dec 21, 2020 11:09 pm

That code is on the carrier flange, looks like a production date.
should be some numbers on the ring gear too.
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Re: Rear end ID help please

Postby monzaz » Mon Dec 21, 2020 11:40 pm

GM Auto locker
AKA as a GOV BOMB
Grenade Lock

lol
It is a stock GM g80 S-10 locker
It is for low speed performance and everyday driving.
It will not lock above 30 MPH

It clunks when it locks and you have to spin one wheel in the mud or snow to get it to lock then you have both wheel gripping...After it is not needed down the road it will unlock again till it encounters one wheel slippage again. BUT only under 30 mph range.

Jim
J D Race & Restoration
Richfield, Oh
JDRACE.COM
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Re: Rear end ID help please

Postby GermanMonza » Tue Dec 22, 2020 3:20 am

Thank you Jim and Smiley, guess I’m not buying it and keep looking for something decent or upgrade what I have.
Great support here on this board, much appreciated :th:
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Re: Rear end ID help please

Postby Monza Harry » Thu Dec 24, 2020 12:41 pm

Those are aluminum calipers and is the bolt pattern right [as in maybe use the rotors and calipers?] for your 5 bolt wheels of choice? The core on Camaro/Firebird calipers is hefty (I just copied the link and these are less than I remember from an earlier check) even in the US. Let the pricing be your guide, as Jim and Smiley point out most of that will not likely be usable. Harry
https://www.autozone.com/brakes-and-tra ... 517090_0_0 Blazer
https://www.autozone.com/brakes-and-tra ... icle=false F Body
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Re: Rear end ID help please

Postby cosvega76 » Fri Dec 25, 2020 12:23 pm

I used Explorer rear disc brakes, I thinks this link will get you to the beginning of my section:

viewtopic.php?f=10&t=28645&p=245225&hilit=explorer#p245225

Swapping sides - using the left assembly on the right side, and vice-versa - the calipers clear the brace in the inner fender well.

I got mine used off of eBay, but there are companies, like Currie, that offer them new as an assembly:

https://www.currieenterprises.com/11-ex ... -brake-kit

Just need to redrill the backing plate for the axle and the rotors for the wheel bolt pattern.


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Re: Rear end ID help please

Postby GermanMonza » Sat Apr 03, 2021 2:21 am

Harry and Chuck, I justed noticed I never replied to you, my apologies. I've just bought a Camaro rear (not sure what year, but torque arm) and I'm using that for now. It has disc brakes, so once I get the rear fenders wide enough there should be enough room for them.
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Re: Rear end ID help please

Postby Monza Harry » Sat Apr 10, 2021 9:07 am

German Monza also take note that the 3rd Gen F-Body doesn't use a 5 on 4.75" Bolt circle it is close but will need to be addressed with e re-drill of the axles or different wheels.
Standard Old School Chevy is 4.75 = 120.65mm 3rd Gen is 118mm https://www.oreillyauto.com/detail/c/br ... maro?pos=0 that will be 0.03365" offset/side, 2.65mm diametrically. Harry
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