Results 1 to 7 of 7

Rear Gears

This is a discussion on Rear Gears within the Drivetrain forums, part of the LSx Technical Help Section category; I seen a post for 3.73 im 02 t/a bone stock ls1 A4 if i was to go to the ...

  1. #1
    Member ls1speedster's Avatar
    Join Date
    Apr 2007
    Location
    Bethany, IL
    Posts
    325

    black
    2002 trans am

    Rear Gears

    I seen a post for 3.73

    im 02 t/a bone stock ls1 A4

    if i was to go to the 3.90 gear or the 4.10 gear...
    - im taching 2100 at 80 how much would gears raise the rpm..

    - how much would top speed suffer...not realy worried tho...

    - what would the shift points do since with stock 2.73 it shifts about 5.900 would everything be fine there or would they have to get moved...

    - how much would gas milage suffer

    im thinking gears after i get a slp lid which is on order..
    any help would be appreciated...
    thanks

  2. #2
    Road Race Addict
    Join Date
    Oct 2005
    Location
    Kansas
    Age
    59
    Posts
    37

    White
    1999 Firebird Formula

    Do you have a high stall torque converter yet. I would go that route before changing rear gears. Ask some of the auto guys what stall you should get.

    The gears will kill your gas milage. You can gain performance and gas milage if you do it right.

  3. #3
    LoudMouth SStriker's Avatar
    Join Date
    Jul 2006
    Location
    Westminster/Sykesville, Maryland
    Age
    28
    Posts
    512

    Red
    2000 Trans Am

    i wouldnt go lower then 3.73 for a street car. It sounds like you have some pretty tall gears as it is right now. 3.73s will be a crazy difference for you.

  4. #4
    Member ls1speedster's Avatar
    Join Date
    Apr 2007
    Location
    Bethany, IL
    Posts
    325

    black
    2002 trans am

    I have stock 2.73 and would like to go to 3.90 or 4.10...

    i have no stall that would be the next thing....i would go with 3000...
    as of right now im looking for gears more rather than stall..

    thanks

  5. #5
    Senior Member slims00ls1z28's Avatar
    Join Date
    Apr 2007
    Location
    TN
    Posts
    1,212

    2005 GTO M6 Black
    2000 Z28 A4 Red

    I have 4.11's in mine and 75 is around 28-2900 RPM with the converter in lockup. Gas mileage dropped with my car but not near as bad as I expected provided I don't play around too much. I still drive it to work on the weekends and it uses right at 15$ in gas whereas it used to use about 12$ a dayand that is with a 3600 stall. Over a 40 mile streatch the useage went up about a 1/16th over what it used to. According to my own calculations I went from about 28-29 to 20-21 MPG most of which is highway but Its a little lower in a bunch of stop and go traffic. Shift points would be the same once you get the speedo recalibrated to match. As of right now mine isn't and it bounces of the limiter everytime if I leave it in gear becaue the MPH is not right according to the computer.

  6. #6
    Junior Member
    Join Date
    Oct 2005
    Location
    Reno, NV
    Age
    61
    Posts
    15

    Navy Blue Metallic
    2001 Camaro SS

    wow.....my 70 Cuda with a 3 speed auto (1, 2, D) and 4.30's was a real beotch. 4.11's with an A4 (which has over drive) is cake.

  7. #7
    Junior Member TwiSSter418's Avatar
    Join Date
    Jun 2007
    Location
    Florida mostly
    Posts
    80

    Pewter
    2000 Camaro SS

    I have an auto with 4.10s and love it. I went from 3.23 to 3.73 and didn't feel a difference at all. Got 4.10s with the new rear and the car finally feels snappy. I also have a 3200 stall torque converter. I would personally recommend a larger stall than 3000. The 3200 I got was barely noticeable until you mashed it and THEN you could feel it. Overall one of the most effective mods I've ever done BTW so I highly recommend getting a stall even if you go with the smaller one.

    As for RPMS at a certain speed, i've always used this website:
    http://www.f-body.org/gears/

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Rear Gears Help!?
    By prater_1 in forum Drivetrain
    Replies: 5
    Last Post: 04-18-2012, 09:48 AM
  2. How do i tell what gears are in the rear end?
    By barryTA in forum Drivetrain
    Replies: 3
    Last Post: 06-20-2008, 11:12 AM
  3. WTB LT1 rear end with 3.42 gears (So Cal)
    By nhra-trans-am in forum Western Members
    Replies: 9
    Last Post: 10-17-2007, 11:47 AM
  4. Rear Gears.
    By ls1speedster in forum Computer & Tuning
    Replies: 3
    Last Post: 07-16-2007, 08:14 PM
  5. Rear end gears?
    By Jeff Jones in forum Drivetrain
    Replies: 30
    Last Post: 06-01-2006, 02:50 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •