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need to talk rear ends

This is a discussion on need to talk rear ends within the Drivetrain forums, part of the LSx Technical Help Section category; hey guys newbi here, just had a couple of questions. This is my first f-body and was wondering what rearend ...

  1. #1
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    silver
    98 trans am

    need to talk rear ends

    hey guys newbi here, just had a couple of questions. This is my first f-body and was wondering what rearend do these cars came with. I have a 98 trans am ls1. I'm looking to put 4.10's in it need to know if i have to change carrier or not. thanks alot for the help guys.

  2. #2
    Rice Killa JwMonE99's Avatar
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    Black With T-Tops
    96 Z28 M6

    If its an A4 get 3.73 gears
    If its an M6 get 4.10 gears

  3. #3
    Wants to be Snowboarding FuhBreezeE's Avatar
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    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    he needs to know if he has the carrier or not for it tho...

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    Rice Killa JwMonE99's Avatar
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    Hell if I know lol

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    Veteran 0rion's Avatar
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    look at your RPO codes in the door.
    GU2 is a 2.73 rear
    GU5 are 3.23's
    GU6 are 3.42's
    You don't say if you're an auto or m6 so those are all three options. If you have 3.23's or 3.42's you have a 3 series carrier....2.73's have a 2 series carrier.
    Last edited by 0rion; 08-17-2007 at 09:56 AM.

  7. #7
    98T/Aformula
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    Quote Originally Posted by 0rion View Post
    look at your RPO codes in the door.
    GU2 is a 2.73 rear
    GU5 are 3.73's
    GU6 are 3.42's
    You don't say if you're an auto or m6 so those are all three options. If you have 3.23's or 3.42's you have a 3 series carrier....2.73's have a 2 series carrier.
    GU5 means you have 3.23 not 3.73s so if your in a a4 and have the code GU2 your going to have to change the carrier but if you have the code GU5 or GU6 you will be good to go...

  8. #8
    Veteran 0rion's Avatar
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    Quote Originally Posted by 98T/Aformula View Post
    GU5 means you have 3.23 not 3.73s so if your in a a4 and have the code GU2 your going to have to change the carrier but if you have the code GU5 or GU6 you will be good to go...
    typo.....fixed.

  9. #9
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    silver
    98 trans am

    yup that is what I was looking for thank you. and its an a4 the reason i am going to 4.10's is that this car will not see highway use just street and strip. Do you know if i can use the factory posi in a different carrier or will i have to go to a locker type. i do have 2.73's

  10. #10
    Veteran 0rion's Avatar
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    I would recommend 3.73's. Also keep in mind this is the stock 10 bolt so any money you're putting into it at the moment will be lost when it grenades on you.

  11. #11
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    silver
    98 trans am

    have you seen or heard any one using after market shafts in there cars? or is that not the major problem with them

  12. #12
    Impounded
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    They make "thick" gears, too, so you don't have to change the carrier. I had 3.73's in my A4 Camaro which was 2.73 stock. I used the thicker gears and it worked fine. Since I used Richmond gears, though, and had an idiot install them, I had a pretty loud whine from 40mph to 80 or so. But it launched like a son of bitch and the chirp between 1st and 2nd was AWESOME!

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    Impounded
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    2000 Firehawk #506 A4

    One more thing, with my 3.73's I was at about 3800rpm's going 80-90 on the highway and my top end was cut to about 125mph before I had to get out of it because it felt like my car was going to explode.

  14. #14
    98T/Aformula
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    I have 3.73s right now and I hit 140 pretty ez, I cant remember the rpms but over all they will run about 3 ta 400 rpms higher with 3.73s just on reg roads, but 4.10s dubble that and take your top speed down to about 135 or so.

  15. #15
    Impounded
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    My driveshaft was out of balance also, so that may have made it sound like it was gonna blow. My car would just start vibrating like crazy at about 120mph.

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    silver
    98 trans am

    can u recall with those thick gears if you had a 4.10 choice. thanks for the info

  17. #17
    Impounded
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    Yeah. If you look in a Jeg's or Summit catalog, they usually have a little symbol next to the number indicating if it's for a 3.08 and lower (thick) or 3.23 and higher (regular) carrier. It's usually an asterisk or a cross or something. My Summit catalog shows up to a 4.56 gear. I'm sure different web sites have the same kind of system. I think you can still make the thinner gears work with a 2 series carrier, but you have to use extra shims or something and it's not as durable or stable.

  18. #18
    Member 98ls1blackbird's Avatar
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    You can get 4.10 gears for a 2 series carrier, but I would advise you to not go higher than 3.73. The reason is this, if you use the car just for cruising and strip you will probably mod the hell out of it. Once you do this, the engine is going to scream just to get through a quarter mile with 4.10 gears at 110-115+ mph. I'm lightly modded with 3.73 gears and if my tach is correct, I'm turning around 5k going through the traps. This is with 26" tall BFG DR's. Good luck with your car and have fun with it.

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