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2.73 to 3.42

This is a discussion on 2.73 to 3.42 within the Drivetrain forums, part of the LSx Technical Help Section category; I have a 2002 A4 z28. I currently have a 2.73 rato gear. My question is i'm having it switched ...

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    Junior Member 2002blackz28's Avatar
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    2.73 to 3.42

    I have a 2002 A4 z28. I currently have a 2.73 rato gear.

    My question is i'm having it switched to a 3.42 this wednesday. I hope a made a good choice. I'm just looking for a little more power from a dig and still get decent MPG. Do you guy's think I will see a little better quarter mile ET?? Also hopefully better street race pull..

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    Moderator Cutlass's Avatar
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    You'll love it!! Yes your 1/4 et should improve.

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    Senior Member Z28_Driver's Avatar
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    Thats what I have in my car still. Its good off the line. Big enough to burn, small enough to hook-up when needed. Have fun.

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    Member 98Hardtop's Avatar
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    You won;t notice a change in power, but it will feel like it. You should see a decrease in your ET's.
    Last edited by 98Hardtop; 09-27-2009 at 09:27 AM.

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    Quote Originally Posted by 98Hardtop View Post
    You won;t notice a change in power, but it will feel like it. You should see an increase in your ET's.
    hmm, i think he was hoping for a decrease in ET.
    nice car BTW.
    Last edited by dklowrider; 09-27-2009 at 07:55 AM.

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    Member 98Hardtop's Avatar
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    Quote Originally Posted by dklowrider View Post
    hmm, i think he was hoping for a decrease in ET.
    nice car BTW.
    Ahh fuck, I meant decrease in the ET. Sorry.

    Thanks.

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    Member TRANS-DAD's Avatar
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    I think 3.42 is a nice choice for an A4 car

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    Member nillam1's Avatar
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    Quote Originally Posted by 2002blackz28 View Post
    I have a 2002 A4 z28. I currently have a 2.73 rato gear.

    My question is i'm having it switched to a 3.42 this wednesday. I hope a made a good choice. I'm just looking for a little more power from a dig and still get decent MPG. Do you guy's think I will see a little better quarter mile ET?? Also hopefully better street race pull..
    Good choice, should be much better of the line! 3.42's rock!

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    Junior Member 2002blackz28's Avatar
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    I have tried to get a set of gears installed at 2 differant garages. I have a '02 z28 automatic with 2.73 gear 2 series carrier. I called up summit and they told me I would need a thick cut gear if I went above a 3.08 gear so I choose 3.42. the box say's 3.42 G.M 7.5+7.625 thick cut 3.42. I went to 2 differant garages and it does not line up with the pinion or abs sensors won't work its like I need to install a spacer and longer bolts. My car rearend has never been changed and is th 2 series carrier Torsen unit. I called up summit and they told me it could have been boxed up wrong from the factory. Its also a summit brand ring and pionion. Very very pissed wasting alot of money

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    what stall converter are you using?

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    Retired NOT tired SteveC's Avatar
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    Quote Originally Posted by 2002blackz28 View Post
    I have a 2002 A4 z28. I currently have a 2.73 rato gear.

    My question is i'm having it switched to a 3.42 this wednesday. I hope a made a good choice. I'm just looking for a little more power from a dig and still get decent MPG. Do you guy's think I will see a little better quarter mile ET?? Also hopefully better street race pull..
    It wont be that noticable until you couple it to a performance torque converter. I went from 3.23 to 3.73, and did not notice too much of a difference, it wasn't until I added a 3k (should have gone 3600) stall that I went from "farfegnugen to fukenmovin".

    Quote Originally Posted by 2002blackz28 View Post
    I have tried to get a set of gears installed at 2 differant garages. I have a '02 z28 automatic with 2.73 gear 2 series carrier. I called up summit and they told me I would need a thick cut gear if I went above a 3.08 gear so I choose 3.42. the box say's 3.42 G.M 7.5+7.625 thick cut 3.42. I went to 2 differant garages and it does not line up with the pinion or abs sensors won't work its like I need to install a spacer and longer bolts. My car rearend has never been changed and is th 2 series carrier Torsen unit. I called up summit and they told me it could have been boxed up wrong from the factory. Its also a summit brand ring and pionion. Very very pissed wasting alot of money
    You have a 2 series carrier with the 2.73 rearend setup, you probably purchased the thinner 3 series carrier gears.

    SteveC

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    Senior Member INMY01TA's Avatar
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    Should have went with 3:73s.

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    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    I changed from 2.73's to 3.42's (changed from my original rearend to a 6 speed rearend) and gained .15 sec in the 1/4 mile (from 13.45 to 13.30). This was also with the stock RSA's... Changing to Nitto 555r's gained a better 60' which again lowered my ET. MPH went up from 106 to 108 (after tires).

    All of this was to an otherwise stock drivetrain and exhaust.

    My biggest gain (from 13.09 to 12.59) was after I installed a 3400 stall TC.

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    Junior Member 2002blackz28's Avatar
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    Quote Originally Posted by SteveC View Post
    It wont be that noticable until you couple it to a performance torque converter. I went from 3.23 to 3.73, and did not notice too much of a difference, it wasn't until I added a 3k (should have gone 3600) stall that I went from "farfegnugen to fukenmovin".



    You have a 2 series carrier with the 2.73 rearend setup, you probably purchased the thinner 3 series carrier gears.

    SteveC
    Just got my new order from summit looks like a mix up from the factory. Same bo same part number but about a .500'' thicker. I think sombody returned them and they shipped me a open box item. I have a local speed shop installing them this wednesday. They say the will work. I will post the results.. Thansks for all the info LS1 rock

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    Junior Member Glue Maker's Avatar
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    well when you get them installed let us know what you think about them, i am planing 3.42's in the future

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    Rockin the Ruckus! 02Sweet's Avatar
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    Quote Originally Posted by Glue Maker View Post
    well when you get them installed let us know what you think about them, i am planing 3.42's in the future
    My car came with 2.73s and I swapped the whole rear out for 3.42s out of a ss manual. I noticed the differnce right away but I don't have track times. I got lucky and got the rear for 200 rotor to rotor

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    Junior Member 2002blackz28's Avatar
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    Quote Originally Posted by Glue Maker View Post
    well when you get them installed let us know what you think about them, i am planing 3.42's in the future
    Just got back home 3.42 rock . It pulls really hard anywhere from 0 to 100 where ever you decide to hammer it down at. I do need the wider rim package now when it shifts into second i get a nice spin just like the 6speed guy's get.. Go with the 3.42 setup and you will love it....The only down fall is there is a little gear whine but nothing that will bother you much. I was told that it may happen because I installed a THICK CUT gear because I have a 2 series carrier and was using a 3.42. The cool thing is before when i had the 2.73 installed I would hammer it at 45mph and not much would happen but now with 3.42 it pulls just as hard as first gear all the way up to 100. Actually when you hammer it at 100 it pulls alot hard than before.

    3.42 gears are a perfect choice for A-4 ls1

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    Senior Member INMY01TA's Avatar
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    Now why didn't you get 3:73s again??

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by 2002blackz28 View Post
    Just got back home 3.42 rock . It pulls really hard anywhere from 0 to 100 where ever you decide to hammer it down at. I do need the wider rim package now when it shifts into second i get a nice spin just like the 6speed guy's get.. Go with the 3.42 setup and you will love it....The only down fall is there is a little gear whine but nothing that will bother you much. I was told that it may happen because I installed a THICK CUT gear because I have a 2 series carrier and was using a 3.42. The cool thing is before when i had the 2.73 installed I would hammer it at 45mph and not much would happen but now with 3.42 it pulls just as hard as first gear all the way up to 100. Actually when you hammer it at 100 it pulls alot hard than before.

    3.42 gears are a perfect choice for A-4 ls1
    Awesome!! I know the feeling. I love new gears.

  20. #20
    Junior Member 2002blackz28's Avatar
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    Quote Originally Posted by INMY01TA View Post
    Now why didn't you get 3:73s again??
    Better than 2.73.. Just the gear I picked .

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