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Thread: When the stock rear goes....

  1. #1
    Registered User Catching Second's Avatar
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    When the stock rear goes....

    .. what parts do you have to replace to make them better again?

    Is it just the gears that funk out or is it the whole assembly? The reason I am asking is because I have a friend who has a set of 3.42s for the same rear as I have (stock GM 10 bolt, 7.5'' ring gear, 3.42). I was just wondering if it was the gears that went. If so, it'd probably be worth the $50 he wants to sell them for just to have a spair set on the shelf.
    "A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo

  2. #2
    Senior Member bigjsp's Avatar
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    You already know my answer.... save the $50 for a 9"

  3. #3
    Registered User Blazin03's Avatar
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    Originally posted by bigjsp
    You already know my answer.... save the $50 for a 9"

    Where is that at?
    Last edited by Blazin03; 06-13-2004 at 03:31 AM.

  4. #4
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    It could be the axles that break.


    I know a lot of people don't like the stock s-10 rear but my brother had the stock rear with 3.08 gears, I believe, non posi, in his 83 s-10 blazer, he had a stock 454 with a turbo 350, he ran it like that for 2 years no problem, then he rebuilt the tranny and engine and dynoed the motor at 470hp/517tq, ran it with no problems, then he found a cheap stock 7.5 with new 3.73 and posi ($100) and ran that for a couple years before he sold it, all this time it was a daily driver. He only took it to the track a couple times, I would convince him to show off regularly for different people but otherwise he drove it normally but didn't hesitate to get into it or even concerned the rear end would go. His experiences may have been unique but it worked for him, if for what ever reason you don't wanna go to another rear and wanna keep the 7.5" I would recommend some sort of heavy duty cover. You could probably look around and get a stock rearend for little out of pocket, if I am not mistaken the 4 cylinder trucks had 3.73. Good luck with what ever you decide
    Last edited by 468blazerII; 06-12-2004 at 11:12 PM.

  5. #5
    Senior Member bigjsp's Avatar
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    The pinion bearings are the primary weakness.

    Watch the pinion seal when it starts leaking you are on you away to needing a new rear end.

  6. #6
    Blazin no mo Forklift's Avatar
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    Originally posted by bigjsp
    The pinion bearings are the primary weakness.
    Ive had mine die on me. Coming home on the interstate I let off the gas and it sounded like I had a jake brake on my firebird.
    what did it sound like when it went out Second?
    04 EC Silverado 4.8L,Pioneer, Rockford Fosgate, K&N, Viper, ACT, USSpeedo, Matrix, Whelen, Blackbear, 22" Eagles, Nittos,Russel,Magnaflow
    85 S-15 2.5L/4spd, RF P1 subs, highs & T4004, JL 250/1, SD 4-link, AIM LCAs, 1/2 valves, Blazer interior, 17" Eagles w/BFGs, phantom grill, 140 amp alt

  7. #7
    Senior Member billp's Avatar
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    the weak link in a 7.5 is the spider gears or the stock posi. Changing to an after market posi such as an Eaton or others wil make the rear hold up.
    84 xCab S-15. No longer ugly but still quick

  8. #8
    Camel Toe Inspector junky2's Avatar
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    I was told by a guy that has a 1st. gen. s10 who
    is into rock crawling and such, that a Ford 9" rearend
    out of a 1967 to 1977 Bronco would fit into an s10.
    He said that is what he has in his truck and that you
    have to relocate the spring perches and shock mounts.
    I'm not sure if this is true or not, and I posted a thread
    back last year to see if anyone on here had done such
    a thing or knew of someone who had, and all the replies
    stated that they didn't think it was possible.

    If this can be done then I'm sure going to put one in my
    ride.
    I'm better than some but not as good as other's!
    1985 s10 V8 Bitch
    http://www.cardomain.com/ride/2171380

  9. #9
    Senior Member billp's Avatar
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    your right, that rear measures 50" backing plate to backing plate. A 2wd S10 measures 48". Close enough I'd say
    84 xCab S-15. No longer ugly but still quick

  10. #10
    Senior Member billp's Avatar
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    I don't know how to send you directly to the Ebay site but here is the ITEM# 2481470618

    Bronco 9"
    84 xCab S-15. No longer ugly but still quick

  11. #11
    16's or bust 91blazin2last's Avatar
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    Originally posted by bigjsp
    :rolleyes:

    Ba - bup - pa pa da dang ga dang dang yi dip ti ta dip - blue moon


    shoo be do wop!





    Just picture your grandparents "bumping uglies" in the back seat of a 57 chevy

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