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2.73 to 3.42 Swap & Tune?

This is a discussion on 2.73 to 3.42 Swap & Tune? within the Firebird / WS6 forums, part of the Vehicle Specific category; I am with the understanding that you will have to have a re-tune when you do the gear swap from ...

  1. #1
    Member bhunter0830's Avatar
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    2.73 to 3.42 Swap & Tune?

    I am with the understanding that you will have to have a re-tune when you do the gear swap from a 2.73 to a 3.42. Can anyone tell me other than the speedo what would be off? Also, does anyone know if Tuned by Frost will do a re-tune and what the cost is?
    2000 Trans Am - Sold
    BBK LT's, ORY, SLP LM2, SLP Cold Air Intake, Wide Band O2, American Racing Torq Thrust 2's, Founders STB, LCA's, LCA Relocation Brackets, Adjustable PHB, BMR Lowering Springs. Deleted AIR & EGR & Tuned By Frost. 1 of 23 MRM with options.

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    Member Nutball's Avatar
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    Hey Ben,
    Nothing else will be effected by the gear other then your speedo. As for the re-tune through Frost....When you send the worksheet with all your addons/boltons, just write "RE-TUNE" and the cost is 50.00 +shipping.

  3. #3
    Member bhunter0830's Avatar
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    Sweet, did you do you own or have it done?

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    Member Nutball's Avatar
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    I did it myself. Took about 4 hours and a few busted knuckles


    Last edited by Nutball; 06-13-2014 at 09:31 PM.

  5. #5
    Member bhunter0830's Avatar
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    Awesome, did you have any issues setting the back lash or any whining when you were done? I'm pretty sure it's worth the time and effort for me to do it not to spend $500-$600 for someone else to do it...

  6. #6
    Member Nutball's Avatar
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    No issues......except
    When I have a load on (throttle-up) there is some noise. I had it looked at after I got done and I was told normal for the size gear, wait for it to "seat" which would take anywhere from 5-8k miles and be thankful it's only on the load side. Meaning when I'm off the throttle, she's quite. If it becomes too much of a nuisance, I could try shim the pinion slightly.
    But over-all..I'm happy. The noise is a little bothersome due to never having any prior to the gear swap.

  7. #7
    Moderator Firebirdjones's Avatar
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    Did you install a used gear?

    Gears swaps are alot of work for a ratio that can be found in a factory rear already. Most guys just grab a 3.42 10 bolt used out of another Fbody and shove the whole assembly in. They aren't hard to find and sell cheaper than the gear swap cost. The biggest obstacle in this case would be finding a 3 channel or 4 channel to fit your needs.
    Might save someone alot of headache that isn't sure of their mechanical abilities on gear swaps.

  8. #8
    Member Nutball's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    Did you install a used gear?
    I would NEVER install a used gear! Total cost for NEW parts were roughly 300.00
    Went with a Motive Performance 3.73. I know most would disagree with the ratio I installed but, I wanted a little more then the stock 3.42 (WS6) and 2.73 (T/A) without having to spend more $$ on a 12 bolt or 8".
    Since I do not race her........

  9. #9
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Nutball View Post
    I would NEVER install a used gear! Total cost for NEW parts were roughly 300.00
    Went with a Motive Performance 3.73. I know most would disagree with the ratio I installed but, I wanted a little more then the stock 3.42 (WS6) and 2.73 (T/A) without having to spend more $$ on a 12 bolt or 8".
    Since I do not race her........
    Nothing wrong with that ratio at all. 3.73 is a nice all around gear that does everything well. I run that ratio in my wifes 6speed, but I installed a 12 bolt.

    I was referring more to the original question of going from a 2.73 to a 3.42 and his concern on how difficult the gear swap would be. Which is why I suggest to just grab a 6speed 3.42 rear complete and change the entire housing. Much easier and more cost effective than an actual gear swap.

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