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3rd gen rear end install in 4th?

This is a discussion on 3rd gen rear end install in 4th? within the Firebird / WS6 forums, part of the Vehicle Specific category; Hello everyone! This is my frist time making a "real" post on this site. I do have to say this ...

  1. #1
    Junior Member transamjeff17's Avatar
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    2001 ws6

    Question 3rd gen rear end install in 4th?

    Hello everyone! This is my frist time making a "real" post on this site. I do have to say this site is awesome and is full of very useful information!
    Here is my situation, i have a 2001 ws6 auto. For the past 20,000 or so miles i can hear a whine coming from the rear end of the car and i feel that its not going to last much longer. I have advailable to me a rear end out of a 89 trans am 305 (auto) that is free. Im curious, will they be compatiable? I wont have any problem ripping out the old one although if things dont fit when i put the 3rd gen rear end in, then i will have a problem lol. Just want some advise before i continue. I dont know anymore information on the rear end of the 3rd gen other than it is a 10bolt also. If it isnt worth it, then sugesstions as to where i can order one from online.(complete bolt up)
    Thanks!
    Jeff

  2. #2
    That guy thearborbarber's Avatar
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    I got a rear with 50000 miles from these folks

    http://motors.shop.ebay.com/merchant/pick_a_part?_rdc=1

  3. #3
    Junior Member teamgotoil's Avatar
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    This is too funny. I just posted the same question on LSXNation a week or two ago. Got some answers from there. Most said it will fit, but it is a little shorter. Requiring wheel spacers. I have yet to try it, but I should be trying it in the next couple of weeks. I will post end results on here. Good luck.

  4. #4
    Senior Member Redphoenix1998's Avatar
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    you will need spacers and depending on the rear, you could lose your rear ABS or TCS

  5. #5
    Senior Member big hammer's Avatar
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    Quote Originally Posted by transamjeff17 View Post
    Hello everyone! This is my frist time making a "real" post on this site. I do have to say this site is awesome and is full of very useful information!
    Here is my situation, i have a 2001 ws6 auto. For the past 20,000 or so miles i can hear a whine coming from the rear end of the car and i feel that its not going to last much longer. I have advailable to me a rear end out of a 89 trans am 305 (auto) that is free. Im curious, will they be compatiable? I wont have any problem ripping out the old one although if things dont fit when i put the 3rd gen rear end in, then i will have a problem lol. Just want some advise before i continue. I dont know anymore information on the rear end of the 3rd gen other than it is a 10bolt also. If it isnt worth it, then sugesstions as to where i can order one from online.(complete bolt up)
    Thanks!
    Jeff

    dude a complete bearing kit is around $100, plus another $200 for new gears if it needs it. just rebuild the one you have! i find it's actually easier then swapping out a complete diff, especially when you gotta start modifying stuff.

  6. #6
    Junior Member teamgotoil's Avatar
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    I am sorry. I forgot to mention...my 4th gen is a drum brake rearend and the 3rd gen is a disc rearend. That could be some of the problem with it being a little more narrow.

  7. #7
    Senior Member bigrondownhiller's Avatar
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    Quote Originally Posted by big hammer View Post
    dude a complete bearing kit is around $100, plus another $200 for new gears if it needs it. just rebuild the one you have! i find it's actually easier then swapping out a complete diff, especially when you gotta start modifying stuff.
    That is what I would do. The third gen is narrower than a 4th. Your wheels will stick out. The third gen could also have drums which would have to be switched to your brakes to work properly. If you want to upgrade a 12 bolt or 9" would be the way to go.

  8. #8
    Junior Member transamjeff17's Avatar
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    thanks everyone for the advice, guess ill start shopping for a new 12'in

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