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Will a 10 bolt 8.5 from an S10 fit?

This is a discussion on Will a 10 bolt 8.5 from an S10 fit? within the Drivetrain forums, part of the LSx Technical Help Section category; I was searching the forums for info on the rear ends used by GM on the s10 and f-bodies. As ...

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    Senior Member kool-aide's Avatar
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    Will a 10 bolt 8.5 from an S10 fit?

    I was searching the forums for info on the rear ends used by GM on the s10 and f-bodies. As always my search skills suck and i didn't find anything let helped.

    I cam across a s10 8.5 10 bolt for sale. I don't know what year s10 it cam out of, yet. I am going to try and contact the person to see if i can get more details. I was wondering if the s10 rear ends are a bolt in for the 4th Gen f-body?

    The 8.5 10 bolt caught my attention because it said is was from an s10 and it was pretty darn cheap, and within driving distance for me.

    I know what everyone will say, why don't you just buy a 9" blah blah. Well, for a fraction of the cost....maybe..... I was just curious. Not sure if I would do anything, but curious.

    I have a suspicion the s10 rear end might be a little narrower?

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    Member squirlnutz's Avatar
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    I think the length is close enough, but you will need to have brackets welded on to place that rear end under your car. That can be expensive. It would be more cost effective to buy a new 12 bolt or the 9incher.
    If you can build a jig of the proper deminsions, so that your new rear end goes right back in like the old one came out, to weld your mounting hard wear on , then you could save money. Most people cant hang a picture strait much less build the proper jig to convert a rear end. Thats also why the after market stuff cost so much .
    Good idea though

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    Senior Member bills98ta's Avatar
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    I thought the S10 had the same 7.5 gears...

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    Senior Member kool-aide's Avatar
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    Quote Originally Posted by squirlnutz View Post
    I think the length is close enough, but you will need to have brackets welded on to place that rear end under your car. That can be expensive. It would be more cost effective to buy a new 12 bolt or the 9incher.
    If you can build a jig of the proper deminsions, so that your new rear end goes right back in like the old one came out, to weld your mounting hard wear on , then you could save money. Most people cant hang a picture strait much less build the proper jig to convert a rear end. Thats also why the after market stuff cost so much .
    Good idea though
    i wasn't sure if the s10 was narrow compared to the 4th gen. I figured going from a leaf to a spring you would need to weld on the perch.

    cost effective, hmmm.... $650 + fab for a 10 bolt 8.5 w/ 3.42s in it or new Moser at oh like $3k. Do you think the fabbing would really run that high? I would take it to a shop for the welding and fabbing. I can't and don't have tools for that.

    I was just curious. My inner voice said this was not common, but thought it would be a good conversation.

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    Senior Member kool-aide's Avatar
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    Quote Originally Posted by bills98ta View Post
    I thought the S10 had the same 7.5 gears...
    apparently there was a special s10 made, a ZR2 or something like that. It came with the GM 8.5 10 bolt. Otherwise you are correct, the normal s10 trucks and jimmies ran the 7.5 10 bolt.

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    Senior Member bills98ta's Avatar
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    I wonder if the internals will swap ?

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    Senior Member kool-aide's Avatar
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    Quote Originally Posted by bills98ta View Post
    I wonder if the internals will swap ?
    i don't think they would. I am only guessing the 8.5 is too big to fit. I bet if they did we would all have heard about it. The axle tubes even look bigger.

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    Senior Member bills98ta's Avatar
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    So True...
    I'd keep looking for a good deal on a moser or 9" rear...
    My motto is " Steal or No Deal " !!!

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    Senior Member kool-aide's Avatar
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    Quote Originally Posted by bills98ta View Post
    So True...
    I'd keep looking for a good deal on a moser or 9" rear...
    My motto is " Steal or No Deal " !!!
    I hear that. I have seen used bolt in setups from Moser go for well over $1k. I think the last one I saw ended up around 1800. That was still a deal but I was not ready to steal.

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    Senior Member bills98ta's Avatar
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    If I see any steals, I will pm you a link !

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    Standard S10s' had the 7.5 10bolt,same carrier and pinion stuff as the f-body 7 5/8 10 bolt. Some S10 carrier also had 26 spline axles(no compatability).
    If some special S10s' had a 8.5 10 bolt,it is a totally different carrier(from the muscle car era of the 60s'/70s'), but it uses the same carrier bearings(ONLY similarity).

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by kool-aide View Post
    cost effective, hmmm.... $650 + fab for a 10 bolt 8.5 w/ 3.42s in it or new Moser at oh like $3k. Do you think the fabbing would really run that high? I would take it to a shop for the welding and fabbing. I can't and don't have tools for that.
    How are you gonna mount a torque arm to that rear end?? Thats the real question here. I'm thinking you'd have to convert to a four link

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    Quote Originally Posted by Cutlass View Post
    How are you gonna mount a torque arm to that rear end?? Thats the real question here. I'm thinking you'd have to convert to a four link
    This...
    :\Users\Steven\Pictures\d6ftg5nh.gif


    Suggestion: If you are particularly irritated by another member's posting habits and are constantly fighting the urge to flame them, you can click on that person's profile, and select "Add to ignore list." This will make that person's posts invisible to you.

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    Member joedude02's Avatar
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    Quote Originally Posted by bills98ta View Post
    So True...
    I'd keep looking for a good deal on a moser or 9" rear...
    My motto is " Steal or No Deal " !!!
    haha. lol, you've spoken of the steals you've gotten.

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    Senior Member bills98ta's Avatar
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    Quote Originally Posted by joedude02 View Post
    haha. lol, you've spoken of the steals you've gotten.
    E-Bay should sponsor my car !!! LOL !!!

    Just sent him a PM !!!

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    Senior Member kool-aide's Avatar
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    Quote Originally Posted by Cutlass View Post
    How are you gonna mount a torque arm to that rear end?? Thats the real question here. I'm thinking you'd have to convert to a four link
    i was thinking about that last night. I dunno, don't you weld on a bracket just like the 12 bolts and 9" ers do?

    A four link sounds nice, but something tells me that is another fabrication, what you going to do....

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    Senior Member bills98ta's Avatar
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    I did pm a link for one on tech, but this site is having some issues... It's not in my sent list, so later this week you'll get it... Found one for 1600.00 !!! It will go quick...

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    Senior Member bills98ta's Avatar
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    Just listed & getting some hits already... Here's the link...
    Rear end
    Last edited by Cutlass; 03-16-2010 at 06:00 PM.

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    Senior Member kool-aide's Avatar
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    Quote Originally Posted by bills98ta View Post
    I did pm a link for one on tech, but this site is having some issues... It's not in my sent list, so later this week you'll get it... Found one for 1600.00 !!! It will go quick...
    i'm sure it will, thanks.

    I talked to the person selling the 8.5 10 bolt. Even he agrees the fabrication cost would be too much. I forgot all about that darn torque arm. I guess I never paid attention to how the 12 bolts and 9" ers were made. I guess that is all factored into the housing when they are making them.

    Well it was worth asking at least. I would rather run the question and see what every one says vs. letting a potential deal walk buy. I don't know how much the rear end he is selling is worth, but it seams like a steal.

    http://cgi.ebay.com/ebaymotors/ws/eB...2200&viewitem=

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    Senior Member kool-aide's Avatar
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    you know what I wish I could bolt in, that fat rear end from a Dodge Dakota R/T. That thing is a beast. But that would have the same problem, leaf to spring fab, and no torque arm. But man that wouldn't be one tough rear end though. I had no fear beating the crap out of mine when i had one.

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