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Rear end question?

This is a discussion on Rear end question? within the Drivetrain forums, part of the LSx Technical Help Section category; I was looking for a bumper on criags list today because mine is starting to crack when I came across ...

  1. #1
    Member jetaws6's Avatar
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    Rear end question?

    I was looking for a bumper on criags list today because mine is starting to crack when I came across a 85 z28 with a 99 trans am 10 bolt in it. My question is would a 9" from a 3rd gen fit in my 98 trans am without any modifications to the rear end or the car? Here is the link if some of you are skeptical. I was kinda shocked when I read it because I did not think they were the same or why someone would spend the money to put a 10 bolt swap in a car.

    http://cnj.craigslist.org/cto/1632666331.html

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    King 0f n00bz shady milkman's Avatar
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    no they are not a direct bolt in.

  3. #3
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
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    but if i am not mistaken ..very little needs to be changed to make it work

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    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
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    i am thinking of the 3 vs 4 channel stuff and such.

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    Veteran Hi-Po's Avatar
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    Quote Originally Posted by shady milkman View Post
    no they are not a direct bolt in.
    Quote Originally Posted by shady milkman View Post
    but if i am not mistaken ..very little needs to be changed to make it work
    Quote Originally Posted by shady milkman View Post
    i am thinking of the 3 vs 4 channel stuff and such.
    Could you not fit this all into one post Shady?

    OP, the 3rd gen rear is more narrow. About 3" inches. (1.5" per side)

    Wheel studs are usually 1/2" compared to 4Th Gen of 12mm x 1.25" metric studs.

    There are also no ABS or TCS provisions. Swapping the LS1 brakes might be tricky as well. I would just hold out for A 4Th gen rearend, but its up to you.

  6. #6
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Hi-Po View Post
    Could you not fit this all into one post Shady?

    OP, the 3rd gen rear is more narrow. About 3" inches. (1.5" per side)

    Wheel studs are usually 1/2" compared to 4Th Gen of 12mm x 1.25" metric studs.

    There are also no ABS or TCS provisions. Swapping the LS1 brakes might be tricky as well. I would just hold out for A 4Th gen rearend, but its up to you.
    lol i dont know why i did that

  7. #7
    Member jetaws6's Avatar
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    I emailed the owner of the car and asked him if it would work in a 4th gen. This is what he said.

    "Now going the other way isnt the best idea even if its a completely upgraded 9" unless it was made with 4th gen length or really really cheap
    You wont be able to run your stock wheels, youd have to have thirdgen wheels or 2" spacers on each side which is really not safe with any kind of real power."

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