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Old 10-17-2013, 08:06 PM
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GM 7.5" worthiness?

Hi all,

I have a Gen 1 S10 with a SBC/700R4. The rear is a 4.11 geared 26 spline 7.5" with an inoperative Gov-Lock. The truck is for cruising/tire spinning/scaring the occasional Mustang. It won't see track time and will never wear slicks/drag radials.

I am debating whether or not to put any money into the 7.5". Were I going to, I thought that upgrading with a new positraction carrier (of a yet to be determined brand) and 28 spline axles might be in order. Or perhaps going with a new aftermarket open carrier and a 28 spline Powertrax No-Slip.

So, my question is would I be throwing good money after bad by upgrading the 7.5"? I could always go the Explorer 8.8" Trac-Lok route, which seems to be popular with S10 guys, but I really do not want to buy new wheels to fix the inherent track width issues.

How about opinions on covers with integrated cap girdles for the 7.5"? I have read that the OEM carriers in the 7.5" are weak, but I do not know anything about the cap strength. Probably on the low end as well I would guess.
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Old 10-18-2013, 05:11 AM
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How much power you making ??? You hear a lot of mixed opinions on the 7.5 but anyone will tell you with big power you want a bigger/beefier rear.
Personally I would go to a 8.8 with 28 spine axles.
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Old 10-18-2013, 05:56 AM
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The 7.5 will probably be all right with hard street tires, as long as you don't have any wheel hop. The Eaton Posi 28 spline upgrade would be good. The caps on the 7.5 are the same as the 8.2 and 8.5 10 bolt, but the T/A Performance cover would be a good idea anyway.
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Old 10-18-2013, 06:27 AM
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Quote:
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The caps on the 7.5 are the same as the 8.2 and 8.5 10 bolt
Thanks BGH - I was not aware of that.
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Old 10-21-2013, 08:00 AM
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I would not put more into that 7.5 rear. If it breaks you have thrown your money away. I would find a stronger one.
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Old 10-21-2013, 09:31 AM
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It's not hard to build a rear end for the S trucks. I've built Chevy car and truck 12 bolt rear ends, 8.5 GM corporate rear ends and 9 inch Ford rear ends for them. You just have to narrow them and put the spring perches on. If you have a housing fixture and if you can weld good then it's not a big deal. You just have to buy a set of axles.
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Old 10-21-2013, 09:43 AM
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BGH - what brand of axles do you like? I noticed that Moser sells replacements for most of the rears I am looking at, and will make them in whatever length I need for non-outrageous prices. That would make the 8.8" swap more enticing for sure.
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Old 10-21-2013, 09:51 AM
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I was a Moser dealer for 15 years. I never had any problems out of them. The 8.8 Explorer needs to be cut down on one end to get the pinion in the right location.
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Old 10-21-2013, 10:04 AM
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I would actually need so go shorter on both sides to keep my current track width.

From what I gather, some S guys buy Exploder 8.8" rears and a spare short side axle, shorten the long end to center the pumpkin, bolt it on with a conversion u-joint and deal with the track and lug pattern differences with new wheels. Were I to use an 8.8" I would just shorten each side to match my 7.5". Not a big deal I suppose - just more work.

The housing jig you mentioned - I assume that is to assure that the axle tubes are straight when you weld them back onto the housing?
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Old 10-21-2013, 01:29 PM
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4 Wheel Drive S-10s

I have a friend that built an S-10 and he used a rear end from a 4-Wheel Drive vehicle. It is an 8.5 set up. One way to tell is the axle tubes get wider at the housing. The wheel base dimensions are the same, so you can stay with your current tire set up. I would go exploring is some junk yards for a 4wheel drive S-10 and see what you can come up with.
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Old 10-21-2013, 04:55 PM
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S 10 4 wheel drive rear ends are 4 inchers wider than the 2 wheel drive rear ends. The ZR2 rear ends are even wider. There are a few 2 wheel drive 4.3 5 speed S trucks that got the 8.5 rear end. They are a little hard to find.

Yes, the housing fixture goes through the housing and lines up the housing ends with the differential bearing bore.
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Old 10-21-2013, 09:39 PM
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Quote:
Originally Posted by Faceless Bob View Post
Hi all,

I have a Gen 1 S10 with a SBC/700R4. The rear is a 4.11 geared 26 spline 7.5" with an inoperative Gov-Lock. The truck is for cruising/tire spinning/scaring the occasional Mustang. It won't see track time and will never wear slicks/drag radials.

I am debating whether or not to put any money into the 7.5". Were I going to, I thought that upgrading with a new positraction carrier (of a yet to be determined brand) and 28 spline axles might be in order. Or perhaps going with a new aftermarket open carrier and a 28 spline Powertrax No-Slip.

So, my question is would I be throwing good money after bad by upgrading the 7.5"? I could always go the Explorer 8.8" Trac-Lok route, which seems to be popular with S10 guys, but I really do not want to buy new wheels to fix the inherent track width issues.

How about opinions on covers with integrated cap girdles for the 7.5"? I have read that the OEM carriers in the 7.5" are weak, but I do not know anything about the cap strength. Probably on the low end as well I would guess.
I run/ran a mini spooled (no need to debate this as I'm aware of the general consensus) 7.5 with just an aftermarket cover most of the summer, it went bottom 12's with a strong 383 but not once did it ever hook. I actually had the explorer 8.8 sitting on the shop floor for when I fragged the 7.5 I could swap it. I sold the truck and never broke the rear, the current owner beats it like it owes him money and its still on the same mini spooled stock rear. Light truck, shty street tires and no axle hop as big gear head says and you would be surprised at how well they hold up.
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Old 10-22-2013, 06:50 AM
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It's starting to sound like massive 7.5" failures are kinda like numbers matching 1960s big block Corvettes - more hearsay than actual reality.
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Old 10-22-2013, 03:27 PM
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Just replace the GM diff with a Eaton or a Auburn posi diff and it will be fine as is.


If the 4.10 gears are the original GM OEM S10 rear gears they are high quality HD.
The best 7.5" gears you can buy. This rear end is plenty strong.
if its worn out high mileage or was never set up correctly, then just rebuild it.

Not that hard.
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Old 10-22-2013, 03:48 PM
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Eaton Posi, Eaton Truetrac, Yukon Dura Grip, Torsen are all fine. Auburn and Eaton Governor Lock are crap.
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