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Rear Gear Upgrade Opinions

This is a discussion on Rear Gear Upgrade Opinions within the Drivetrain forums, part of the LSx Technical Help Section category; Originally Posted by bigboykilroy Got the new gears today, Hopefully I will get a change to install them over the ...

  1. #21
    Senior Member clg82's Avatar
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    2000 Trans Am

    Quote Originally Posted by bigboykilroy View Post
    Got the new gears today, Hopefully I will get a change to install them over the weekend. I will post up the new Drive Around town results soon.
    cool buddy i'll wait for the responce!! where did you get the gears by the way?
    2000 Arctic White trans am, ws6 hood, ws6 air box, slp lid, slp smooth bellows, slp loudmouth exhaust,shift kit, rebuilt trans, LS6 intake, 3.73 gears, Shaner S3 p/p throttle body, and a tune . SFC. C6 ZO6 rims 18" in back 17" in front. Drilled and slotted rotors.

  2. #22
    2 SS's are better than 1 Jays00ss's Avatar
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    NBM / Silver
    00 SS / 71 SS Elcamino

    www.f-body.org/gears
    Try this site to help you decide.

  3. #23
    Senior Member slims00ls1z28's Avatar
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    2005 GTO M6 Black
    2000 Z28 A4 Red

    Quote Originally Posted by 2000T/A Guru View Post
    Obviously you will notice a difference, however goin 3.90s with a a4 is just stupid unless its a track only car, at like 60mph you wil lbe at like 3000rpms.
    Not even close I have 4.11's and can get a tad over 75 almost 80 before I'm turning 3k. Oh and I drove it weekends to work 100 miles round trip each time.
    My Toy 00 Z28 1SC A4 - MS3 cam with supporting valvetrain, Milled LS6 heads, LS7 lifters, , ARP rod and mains, All free mods, pacesetters, True duals, moser 9 with 4.11's and Detroit Locker, Vig 3600 tuned, tubular SFC,adj PHR, LCA, adj TA, PHR reloc, LCA reloc. all with poly bushings, ZR1's and Nitto DR's (315).

    My other toy 05 GTO LS2 M6- Comp XR269HR cam, 918's, hardened pushrods, Dart Pro 1's, pacesetters, X-pipe, flowmaster 1 chambers, TSP oil pump, Tick master cylinder. Pedders RR bushings, end links, SB bushings, tie rods and strut mounts, total performance poly F&R bushings. Polk DVC 12", Infinity Kappa 6.5 component and 6x9's with corresponding amps.

    Her toy 77 F100-6.6/c6. All original (for now)

  4. #24
    11 Second Club 11.34 bigboykilroy's Avatar
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    Red
    1998 Firebird Trans AM

    This is exactly why I decided to change out my 3.42 gears in my A4 to 3.90 because no solid answer can be found regarding these gears. 3.73 seem to be the prefered upgrade set, 3.23 was an option with our A4 cars. Since then Motive revently came out with a 3.90 gear.(last year i Believe) I have posted my cars RPM vs MPH table as a stock 3.42 A4, and will post my cars RPM vs MPH with the 3.90 gears. Then we will have actual number to help other members with the A4 select a proper grear set for their car and application.
    The gears should be installed later this week, I have to be very flexable because my engine/Trans guy is donating his time to us for this aftern asked question.....more data soon to come.
    Last edited by bigboykilroy; 10-01-2007 at 01:10 PM.

  5. #25
    Senior Member clg82's Avatar
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    2000 Trans Am

    Quote Originally Posted by bigboykilroy View Post
    This is exactly why I decided to change out my 3.42 gears in my A4 to 3.90 because no solid answer can be found regarding these gears. 3.73 seem to be the prefered set but they were an option with our A4 cars. Since them Motive revently came out with a 3.90 gear. I have posted my cars RPM vs MPH table as a stock 3.42 A4, and will post my cars RPM vs MPH with the 3.90 gears. Then we will have actual number to help other members with the A4 select a proper grear set for their car and application.
    The gears should be installed later this week, I have to be very flexable because my engine/Trans guy is donating his time to us for this aftern asked question.....more data soon to come.
    Are you sure that the 3.73 was an option for our cars? i am almost positive the highest they came stock with an A4 was 3.23 but i may be mistaken! can't wait to see those results!! thanks transmission guy!!!

  6. #26
    11 Second Club 11.34 bigboykilroy's Avatar
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    Red
    1998 Firebird Trans AM

    I'm Sorry Mistype 3.23 - Fixed - Thanks.

  7. #27
    Senior Member clg82's Avatar
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    2000 Trans Am

    Quote Originally Posted by bigboykilroy View Post
    I'm Sorry Mistype 3.23 - Fixed - Thanks.
    good work

  8. #28
    11 Second Club 11.34 bigboykilroy's Avatar
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    Red
    1998 Firebird Trans AM

    Still waiting on my engine/trans guy. He had a bad leak on the shop roof, so we have been re-roofing his place the past couple of days. Hopefully we will finish up the roof tomorrow and can get these gears installed thursday night. !!

  9. #29
    11 Second Club 11.34 bigboykilroy's Avatar
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    Red
    1998 Firebird Trans AM

    Tues Night 10-9-07 -

    The 3.90 Gears are installed !!!!

    They feel really good driving around town. I only took it up to 55 MPH tonight, want to break in the gears right, I will Drive it more around town the next couple of days. I should have my new RPM vs MPH table up friday, planning on going to the track Sat to test the 1/4 times.

    So far I would recomend the 3.90 gears for us Auto Guys over the 3.73. SO FAR ITS only got about 30 min on the new gears.

  10. #30
    11 Second Club 11.34 bigboykilroy's Avatar
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    Red
    1998 Firebird Trans AM

    Here is the speeds and RPM on my car with a stock converter, and the 3.42 rear end and 26 inch tall tires.

    50 MPH - 1550 RPM
    55 MPH - 1700 RPM
    60 MPH - 1850 RPM
    65 MPH - 2000 RPM
    70 MPH - 2150 RPM
    75 MPH - 2300 RPM
    80 MPH - 2450 RPM
    85 MPH - 2650 PRM
    90 MPH - 2800 RPM

    Here is the speeds and RPM on my car with a stock converter, and the 3.90 rear end and 26 inch tall tires.

    50 MPH - 1750 RPM
    55 MPH - 1950 RPM
    60 MPH - 2150 RPM
    65 MPH - 2300 RPM
    70 MPH - 2450 RPM
    75 MPH - 2650 RPM
    80 MPH - 2800 RPM
    85 MPH - 3000 PRM
    90 MPH - 3200 RPM

    I Love these Gears !!
    The car responds very well to the grears under moderate to semi aggressive driving but not tested at track under WOT yet.

    As long as the weather holds out I will be going to the track the Sat to do more testing.

    So far I would definately recomend these gears for the Auto cars.

    The tables at http://www.f-body.org/gears/ are very acurate to what my HPT Logged duruing actual driving conditions.
    Last edited by bigboykilroy; 10-11-2007 at 05:55 AM.

  11. #31
    Senior Member 35thAnniZ28's Avatar
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    eating bulldog
    son of biscuit

    thats awesome....have you gotten the infamous noise yet?

  12. #32
    11 Second Club 11.34 bigboykilroy's Avatar
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    Red
    1998 Firebird Trans AM

    The Gears are actually pretty quiet, I have UMI Perf, full suspension, Sub, lower control Etc. so I'm used to the drive line noice that is transfered into the car, I only get a slight hum from the gears at 35-40 MPH in OD. But i think I can correct it with a slight pinion angle adjustment. Flying down the freeway they are smooth as butter.

  13. #33
    11 Second Club 11.34 bigboykilroy's Avatar
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    Red
    1998 Firebird Trans AM

    Went to the track today. These Gears Rock !!
    Got myself into the 12 sec club!!!

    Reaction: .597
    I1: 1.936
    I2: 5.513
    I3: 8.404
    MPH I3: 83.391
    I4: 10.822

    E.T. : 12.968
    MPH: 107.826

    Next I need to install a shift kit to take full advantage of these gears, they really pull hard right above 5000 RPM, Stiffen up the shifts will take more time off.

    I give the 3.90 gears a definate A++++ 3.73 are good choice but if you want just a bit more go 3.90.

  14. #34
    Moving forward. Pyromaniacal's Avatar
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    Blue/Yellow/White
    95 T/A 383

    I have 3.73's on my A4 and my cruising levels are virtually identicle to yours.

  15. #35
    11 Second Club 11.34 bigboykilroy's Avatar
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    Red
    1998 Firebird Trans AM

    The 3.73 and the 3.90 are the exact same price at Summit as well.

  16. #36
    Senior Member clg82's Avatar
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    Awesome big boy!! i am definatly going to go with these. how do they react on the street. i do most of my racing on the street and i want something that i know will still give me good traction!!!

  17. #37
    Senior Member 35thAnniZ28's Avatar
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    eating bulldog
    son of biscuit

    hey guys...don't mean to jack the thread..but my axles are fucked...would anyone know where i would be able to get performance ones or just the regular ones?

  18. #38
    11 Second Club 11.34 bigboykilroy's Avatar
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    Red
    1998 Firebird Trans AM

    You should be able to get some good axels thru summit.

    I say summit cuz they are about 30 min away from me.

    On the street they do good. I run my MT radials on the street. Havent tried it on the street with street tires. But taking off at a red light it lights them up when it 2nd shifts. It will prob do it more once the shift kit is installed.
    I may get one of them later in the week and take it to the track one more time.

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