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Thread: What Gears Do I Have?

  1. #1
    Join Date
    May 2008
    Location
    Bay Area
    Posts
    6

    What Gears Do I Have?

    Is there a way i can tell what gears (Stock) I have from the Vin #.......I am due for gears soon so if I have 3.42's should I go to 3.73???? I do have the
    I6TB TC installed with a Nelson Tune and K&N ??? Any suggestions..Thanks guys
    2000 ECSB, K&N CAI , 2/4 Drop , 40 Series Flowmaster, I6TB TC, and Nelson Tune.....Need Gears before it blows!!!!

  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Do you still have the glove box label that shows all the install codes listed? Look in there and the factory installed gear ratio code will be listed. The break down of the gear ratios is listed here somewhere.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    Join Date
    Mar 2006
    Location
    Mesquite
    Posts
    8,176
    Look for the GT code...prob be GT4 which is a 3.73 gear.

    Go here to confirm.

  4. #4
    Join Date
    May 2008
    Location
    Bay Area
    Posts
    6
    Perfect!!! I have 3.42's.....Do you think i should go to 3.73's?....How much will that affect my MPG's. I already have a TC installed and am wondering if it will be overkill? Input wanted???
    2000 ECSB, K&N CAI , 2/4 Drop , 40 Series Flowmaster, I6TB TC, and Nelson Tune.....Need Gears before it blows!!!!

  5. #5
    Join Date
    Dec 2003
    Location
    Azle,TX
    Posts
    3,682
    i have had 3.42s.430.s and now 3.73s....i think 3.73 is the best so far and my MPG is still good
    Vortec Performance Tuned
    LQ9 built 4L60 LTs and a billion miles on the speedo!

  6. #6
    Join Date
    Feb 2007
    Location
    Fort Worth
    Posts
    9,578
    IMHO, 3.90 gears would be a good set.

    2000 ECSB 6.0L
    TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's

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