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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; Originally Posted by 2002blackz28 Just got back home 3.42 rock . It pulls really hard anywhere from 0 to 100 ...

  1. #21
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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
    You do realize that there is a breakin procedure for a new ring and pinion set don't you? If you've burnt your oil you better go ahead and change it before 500 miles or your new gears might be toast. Your not suppose to even get on it hard until after several heat cycles.
    Last edited by PFM; 03-25-2010 at 12:46 PM.
    TSP 347 SB, TSP Stage 2.5 PRC LS6, TSP MS4, Performabuilt Stage 2 4L60E, Yank PT4000, 4.11s, Fast 90/90, FTRA Cold air intake+all the free mods, Dynatech Supermaxx Exaust System, DMH Cutouts, Hooker Catback/FTRA Tips. Tuned by RPM/Garner NC. 11.28@119

  2. #22
    Senior Member 98maro's Avatar
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    What's the stock gears on 98 z28? 6speed
    thanks

  3. #23
    Just me Y2KPewterSS's Avatar
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    Quote Originally Posted by 98maro View Post
    What's the stock gears on 98 z28? 6speed
    thanks
    Any LS1 with manual tranny came stock with 3:42s.

  4. #24
    Senior Member 98maro's Avatar
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    Ok. Thank you

  5. #25
    Auto Painter RyanJM's Avatar
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    I had 3.23'a in my 98 TA A4 and swapped to a motive 3.73 and when we reprogramed the tranny for the new gears and also tuned it more aggresively so it shift hard and faster and with the 3.73 it launched harder.
    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
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  6. #26
    Junior Member 2002blackz28's Avatar
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    2002 camaro z28

    Smile

    Quote Originally Posted by PFM View Post
    You do realize that there is a breakin procedure for a new ring and pinion set don't you? If you've burnt your oil you better go ahead and change it before 500 miles or your new gears might be toast. Your not suppose to even get on it hard until after several heat cycles.
    Yes they did tell me this I hit the E-WAY for about 150miles round trip . I stopped once to get a bite to eat let them cool down. I did not get on it to hard until later that day. I will change the oil later this week. They seem to be fine. Thanks for looking out for me. It's just kind of hard not to once I noticed the big differance.

  7. #27
    12 SECOND CLUB FASTEDDIE Z's Avatar
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    1998 Z28 12.53@107.8

    I went from 273 to 373 and this is my results.Car feels a lot better .
    On my run, I didnt even get it up on the converter .As soon as I staged ,the tree started .Hooked ok in 1st ,it spun a little when it shifted into 2nd .LOOOONG ass chirp ..

    Previous best with catback, SLP lid and 273 (A4)
    -600 D/A
    R/T -.186 ( sleeping )
    60 - 2.04 ( dead hook )
    1/8 - 8.8
    1/4 - 13.49 @104.3

    Tonight w/ same + 373's ,m/o tune and drag radials.(heavier ZR1 17"OE wheels )
    -525 D/A
    R/T - .177 ( still sleeping )
    60 - 1.97
    1/8 - 8.4
    1/4 - 13.16 @106.5 mph

    I know I could of bettered that if I could of had another shot ( I got kicked out after one run for my helmet ). It was getting colder out and I would of launched harder .
    Ill never find out .. Im installing my Yank SS4000 stall next week

    1998 A4
    Last edited by FASTEDDIE Z; 04-03-2010 at 04:00 PM.

  8. #28
    Junior Member Glue Maker's Avatar
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    ^^^looks like the gears help quiet well

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    Senior Member INMY01TA's Avatar
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    Heh, wait till he gets the convertor in there..

  10. #30
    12 SECOND CLUB FASTEDDIE Z's Avatar
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    1998 Z28 12.53@107.8

    Quote Originally Posted by INMY01TA View Post
    Heh, wait till he gets the convertor in there..
    I cant wait

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