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what gears do i need (help )

This is a discussion on what gears do i need (help ) within the Drivetrain forums, part of the LSx Technical Help Section category; hi all i am confused i have a 99z with 2.73 and hate them. i want to go to 3.42 ...

  1. #1
    Awaiting Activation lovedrvr's Avatar
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    what gears do i need (help )

    hi all i am confused
    i have a 99z with 2.73 and hate them.
    i want to go to 3.42 motive performance set
    now what do i need 7.5,7.6,8.5 new style, series 2, series 3,30 spline 27 spline,28 spline ?????????????????????????????????????????????

    will this set work ??
    http://www.ws6project.com/user_stor/...oducts_id=1294

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    A 99Z with 2.73s' has a 2 series carrier with 28 spline axles.Your problem is common to those with 2.73s'.Changing to 3.23,3.42,3.73,and 4.10 requires a 3 series carrier OR using a 'ring gear spacer',not recommended because it can cause a lot of problems.Sometimes it's easier and cheaper to acquire a complete 'take out' rearend that already has 3.23/3.42.For that situation,3 channel and/or 4 channel compatability has to be taken into account.Hope this helps.
    Also it's a 7.625 gear on carriers that also accept 7.5 gears.
    Last edited by oldmanZ28; 04-03-2009 at 02:42 PM.

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    Awaiting Activation lovedrvr's Avatar
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    shure its a 28 spline cant find them
    will this work if not someone point me to a link that will please

    http://www.jegs.com/i/Richmond+Gear/...05-1/10002/-1#
    or this
    http://www.jegs.com/i/Richmond+Gear/...42TK/10002/-1#
    or this 1
    http://www.jegs.com/i/JEGS/555/60008/10002/-1#

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    All 3 will fit as they're all for a 2 series carrier.
    You brought out the other option that I forgot about in my previous post.Buy a set of gears that are made for a series 2 carrier.
    Quite often,someone will acquire a 'take out' GM 3.42 gearset and want to use them in their 2.73 car,that's what my original response was to.If you're starting off with nothing and looking to purchase,a set made for a 2 series carrier is the way to go.

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    Member Bandit1's Avatar
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    that is what i did. i have the bullshit 2.73's. i ordered the 3.73's for the 2 series carrier.

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    Awaiting Activation lovedrvr's Avatar
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    i would do the 3.73's but dont want the high rpms at 80 mph highway cruise

    got this set

    23-875342-X Strange Pro-Street Gears, 3.42 Gear Ratio, 2 series carrier, GM 7.5" 10 bolt rear end
    with this
    98-02 LS1 Ratech Deluxe Gear Installation Kit
    and
    93-02 LS1/LT1 MAC Rearend Girdle

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    LSX whore allbaugh_04's Avatar
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    A stall will fix your gear problems...

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by lovedrvr View Post
    i would do the 3.73's but dont want the high rpms at 80 mph highway cruise
    I wouldn't call 2,000rpms high. Shoulda got the 3:73s.

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    my A4 w4.56s' cruise at 3000 at freeway legal speeds.Coming back from Florida to Ohio in Oct.08 from the Daytona Beach Dream Cruise,cruise control to stay with a fast moving group of vehicles in South Carolina put us at 4000 rpm for about an hour.

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    get a 12 bolt with 3.73's in it

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    Quote Originally Posted by INMY01TA View Post
    I wouldn't call 2,000rpms high. Shoulda got the 3:73s.
    wait a minute, youre doing 2k rpms at 80 mph with what gears?

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by dklowrider View Post
    wait a minute, youre doing 2k rpms at 80 mph with what gears?
    My bad I'm thinking like 70mph.

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    Quote Originally Posted by INMY01TA View Post
    My bad I'm thinking like 70mph.
    that sounds better, 2.73's then obviously.

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    Awaiting Activation lovedrvr's Avatar
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    had me going there also.
    mine has 2.73 and at 70 i sit at 2000 rpm.
    so with the 3.42 i should be around 2400 just what i want.
    its not a drag car,but i do love to play and i drive it 1/3 of the time (have a 1200 bandit and ram 1500)and it does have a 2500 stall in it.
    i looked at a 10 bolt with 3.72 on e-bay for $600 (about what i will run me total for the gears,full rebuild kit,ta cover and install)and i will know what i have.
    have been hearing kind of a funny ring sound from the rear anyway,with 80,000 miles think its time to fresh it up and bring it to life on the bottom end,without tottaly killing my mpg,i do only run 93 in her.

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by lovedrvr View Post
    had me going there also.
    mine has 2.73 and at 70 i sit at 2000 rpm.
    I find it hard to believe that an A4 w/2:73s runs 2000 rpms at 70mph when an M6 w/4:30s is about 2000 rpms at 75mph. With the stock 3:42s my car (M6) was 1,600 rpms at 70ish.

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    Auto Painter RyanJM's Avatar
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    Quote Originally Posted by lovedrvr View Post
    had me going there also.
    mine has 2.73 and at 70 i sit at 2000 rpm.
    so with the 3.42 i should be around 2400 just what i want.
    its not a drag car,but i do love to play and i drive it 1/3 of the time (have a 1200 bandit and ram 1500)and it does have a 2500 stall in it.
    i looked at a 10 bolt with 3.72 on e-bay for $600 (about what i will run me total for the gears,full rebuild kit,ta cover and install)and i will know what i have.
    have been hearing kind of a funny ring sound from the rear anyway,with 80,000 miles think its time to fresh it up and bring it to life on the bottom end,without tottaly killing my mpg,i do only run 93 in her.
    I believe the sound is the gears. I chewed mine up on a Houston to Dallas ride. the highway onpend up, I put the pedal down, somewhere after 135 i heard a pop and grind and a lond hum and whine all the way home. Drounded the radio out. I have a A4 with 3.23's and replaced them with 3.23 and friday it's getting 3.73's till I get the M6 swapped in around OCT. Then a 9" and some tighter gears but not sure what cam i'm going with so that will decide the gears.
    1998 Trans Am 85k miles.
    Bolt ons, MS3 113LSA cam, Circle D Stall, Tune, Modified WS6 style hood, Full Suspension, 6000k HID's, Clear Side Markers w/ Leds, Led 3rd Brake Light and 18" AR Staggered Killer Wheels w/ BFG KDW NT's.- Weekend Toy/DD
    02 Trailblazer -Sold
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    Quote Originally Posted by INMY01TA View Post
    I find it hard to believe that an A4 w/2:73s runs 2000 rpms at 70mph when an M6 w/4:30s is about 2000 rpms at 75mph. With the stock 3:42s my car (M6) was 1,600 rpms at 70ish.

    I sit at 2000RPMS at 70mph. I have 2.73s....

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    Quote Originally Posted by INMY01TA View Post
    I find it hard to believe that an A4 w/2:73s runs 2000 rpms at 70mph when an M6 w/4:30s is about 2000 rpms at 75mph. With the stock 3:42s my car (M6) was 1,600 rpms at 70ish.
    i just posted on another thread with that same question. obviously the output ratio of the m6 is much higher than the a4 in high gear! with 26" tires at 70 mph im running at exactly 1950 rpms in high gear.

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    Senior Member INMY01TA's Avatar
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    Interesting.

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