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Eaton Posi with 3.73 or stay with open???

This is a discussion on Eaton Posi with 3.73 or stay with open??? within the Drivetrain forums, part of the LSx Technical Help Section category; I have a 2000 z28 with the 2 series carrier and 2.73 gears. I am going to change to the ...

  1. #1
    TNT
    Guest

    Eaton Posi with 3.73 or stay with open???

    I have a 2000 z28 with the 2 series carrier and 2.73 gears. I am going to change to the 3.73 gears but I'm not sure if I should stay with the stock open carrier and add the strange 3.73 wide ring gear or go with a new Eaton posi carrier and new GM 3.73 gears. My local shop gave me a price of $1,110 for everything installed. I think that is pretty steep but is the Eaton worth the extra $400????

    That price doesn't include computer changes. What programmer or computer program is the best to use for making the changes I will need to make?

  2. #2
    Ugly but well hung, A-10 SS#1531's Avatar
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    1998 Camaro SS M6 Hardtop

    Your Z28 came with a Torsen limited slip diff, that should be plenty good enough unless you're putting down serious power and sticky tires. In which case you would need a 12 bolt anyway. I wouldn't spend the money on the Eaton if I were you.
    1998 Camaro SS
    Red w/ Silver stripes, M6, Hardtop
    Pretty much all the engine and suspension bolt-ons, and 3.73's

  3. #3
    TNT
    Guest
    Thanks for the input. I seem to only get the right side spinning at times and that left me with the impression it was an open rather than limited slip? Did the Z28 only come with the limited slip with the series 2 carrier?

  4. #4
    "Lucky" Luciano
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    I have a used Eaton posi unit in great shape for sale.

  5. #5
    TNT
    Guest
    How much for the Eaton? I'm dropping the car off on Monday evening and having the 3.73 gears put in and the thunder racing cover put on. $650 for the works plus the cost of the cover. I'm hoping that I'm not going to spend the money to spin the crap out of 1 tire. That would suck!!

  6. #6
    yak
    Guest
    i have a new 3 series auburn posi 240 plus shipping.

  7. #7
    TNT
    Guest
    SS#1531 you hit the nail on the head. Thanks for your help. I ended up sticking with the series 2 carrier and put in thick 3.73 gears and added the Thunder Racing Cover. I need to get a programmer now because my speedo is so far off. Before the gear change @ 60 in Drive 2200RPM, now 3100RPM @ 60. Big - Big - Big performance difference. (MILOC-Shorty your goin down!!!!)

  8. #8
    Shorty
    Guest
    SS#1531 you hit the nail on the head. Thanks for your help. I ended up sticking with the series 2 carrier and put in thick 3.73 gears and added the Thunder Racing Cover. I need to get a programmer now because my speedo is so far off. Before the gear change @ 60 in Drive 2200RPM, now 3100RPM @ 60. Big - Big - Big performance difference. (MILOC-Shorty your goin down!!!!)
    You better be spraying and praying to beat me. R/S Shorty AKA Blinx.

  9. #9
    TNT
    Guest
    Blinx spend wisely the next mod is the DOUBLE SHOT!!!!!!!!!! Gears won't help you. Have fun at Woodward looks like a cool place to be.

  10. #10
    BlackHawk T/A
    Guest
    Quote Originally Posted by TNT
    SS#1531 you hit the nail on the head. Thanks for your help. I ended up sticking with the series 2 carrier and put in thick 3.73 gears and added the Thunder Racing Cover. I need to get a programmer now because my speedo is so far off. Before the gear change @ 60 in Drive 2200RPM, now 3100RPM @ 60. Big - Big - Big performance difference. (MILOC-Shorty your goin down!!!!)
    Really? I turn 2200RPM at about 75mph...A4.

  11. #11
    Member TwistedSS's Avatar
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    Arctic White
    2001 Camaro SS

    Quote Originally Posted by SS#1531
    Your Z28 came with a Torsen limited slip diff, that should be plenty good enough unless you're putting down serious power and sticky tires. In which case you would need a 12 bolt anyway. I wouldn't spend the money on the Eaton if I were you.

    Did the 99's come with the same differential

  12. #12
    TNT
    Guest
    I think the 99 is the same. When I bought mine, if I remember correctly they were the same part number for the 98 to 02 cars. You just need to know what carrier you have. 273 gears had the series 2 carrier and the 323 and 342 gears have the series 3 carrier.

    http://www.thunderracing.com/catalog...&vid=3&pcid=67

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