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Old 02-15-2005, 08:15 PM
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V8 S10

I currently am building a 383 stroker for my s10. I plan to make around 400 hp, I am worried about my rearend holding up. It currently has a stock 7 5/8 i do believe. I held up to the stock 350 but now after engine mods, I dont think is will. Do u think a locker and new gears. Will it hold up??? Or should i try to find one of those rare s10 8 1/2?? Or even have an 8 1/2 or 9 modded to fit in an S10?? Any help or suggestions plz!!
thanks

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Old 02-15-2005, 08:32 PM
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rear end

Most rear ends will hold up as long as you don't run slicks. Personally I wait for things to break before fixing them.
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Old 02-16-2005, 05:41 AM
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The 8.5 in the 1996 and up 4WD S-series vehicles with the 4.3 is not all that rare.
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Old 02-16-2005, 04:26 PM
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I went with the 8.5" axle.
http://forums.s-series.org/viewtopic...ghlight=10bolt

After pricing it all out it was the cheepist solution for a strong axle with disc brakes (even counting the free full size 8.5" I got).
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Old 02-16-2005, 04:56 PM
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You will find that the stock 7 5/8" axle will start giving you troubles once you start putting 350HP and 400LbFt on the ground. I'm assuming your 400HP estimate is at the flywheel. If so, you are going to be close after you deduct the losses from the drive train.

You can increase the strength of the axle, but only marginally. Housing flex is the main issue. You can get axles, gears, and posi units that will hold up well,but when the housing itself flexes, the alignment of the gears is effected. Run a gear out of alignment for long and it will eat itself.......


Spending a bunch of money on the 7 5/8" axle to make it stronger, to me, is foolish. You would be better of spending the money on a 9" Ford, or 8.5" Chevy to start with.

To find an 8.5" in a junk yard out of a newer model, with disc brakes would give you a good axle for the least amount of money spent.

The 2WD 8.5" axle is hard to find.

Chevy used three different width 8.5 axles in the S-10.

The ZR2 had the widest. It was about 8" wider than a 2WD axle.

The standard 4X4 trucks axle was 4" wider than the 2WD. The only 4X4 truck to get the 8.5 was the 95&up L35 equipped 5-speed models.

The 2WD trucks from 95&up equipped with the L35 and 5-speed is the axle you are looking for. The 8th digit of the vin would be a "W", and the glove box door would have RPO G87 listed. For disc brakes, look for a 98&up.(Blazer for sure. Don't know for sure what year the trucks started with rear disc.) Dan
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Old 02-16-2005, 06:45 PM
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Thanks for the information guys, this may be very useful to many considering a swap like this one.

I didn't have the specifics but you guys came through.
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Old 02-18-2005, 12:13 PM
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I just picked up a ZR2 with 373's disks and a locker with 21000 mi for $300. Installing in a 85 S-10 4X4 w/355 and 700-R. The factory rear has not given me any trouble yet, but I had small tires on it before. I don't think the factory rear would hold up very long with the new Super Swampers.
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Old 02-18-2005, 04:15 PM
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I currently live in windsor, ont.. Ive tryed to look all around here but no luck. Ive tryed as far as london but they dont have ne either. Ne1 now somewhere in michigan or not to far from windsor??? Also do u know what yrs and makes had the 8.5??? what about the blazers too???
thanks
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Old 02-18-2005, 08:09 PM
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Also do u know what yrs and makes had the 8.5??? what about the blazers too???

I am reluctant to answer these questions...........Again.

Perhaps, you should re-read the responces in this post.........
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Old 02-19-2005, 03:54 PM
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Ohio Dan is right about the different measurements on the rear axel housings, but all the spring mounts are the same. This means, of course, that they bolt right up. I currently have a rear unit from a 4x4 (a Syclone) in a 2 wd Sonoma. The wheels stick out of the sides slightly (about 2 ") but not so much they can't be covered with some flares. I might add it makes them look pretty cool with the larger rollers on them.

Dave
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