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Going from 3.73 to 3.42, Speedo gonna be faster or slower?

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  • Going from 3.73 to 3.42, Speedo gonna be faster or slower?

    My car is going from a 3.73 gear to a 3.42,
    Is the speedometer going to be faster or slower than my actual speed?

    Currently the car is set with EFI live for a 3.73 gear.

    thx
    sigpic
    2004 Cummins 3500 4x4 QCSB Auto, 5" Exh, CAI, 20" GunMetal7s, 35" Goodyears, Fender Flares

    ----------

    03 Z71 Loaded, Bose, Htd leather, etc
    (Sold)
    00 Camaro Z28 M6 T-tops (Sold)
    00 Camaro SS A4 T-tops (Sold)
    99 C5 Corvette M6
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    98 Camaro Z28 A4 Coupe
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    98 Camaro Z28 A4 T-tops
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  • #2
    3.73 @ 70 =2400
    3.42 @ 70=2200

    Comment


    • #3
      what are u doing with the 3;73's looking to but some??

      Comment


      • #4
        speedo will slow down
        wishing i could drive like joe and the atm squad

        Comment


        • #5
          Originally posted by b.lee View Post
          My car is going from a 3.73 gear to a 3.42,
          Is the speedometer going to be faster or slower than my actual speed?

          Currently the car is set with EFI live for a 3.73 gear.

          thx
          Speedo will be fine...will not be faster/slower than actual speed.
          Originally posted by Redd8407
          I WANT NOISE! SPEED! AN ENGINE THAT SHAKES MY INTERNAL ORGANS LIKE THEY GOT PARKINSON'S! I DONT WANT AN ENGINE THAT IS PARTIALLY POWERED BY MY LAPTOP BATTERY!
          Originally posted by Z28ISGR8
          WHY THE F*CK IS THERE A GOAT ON A FERRARI?
          Originally posted by Darren
          I think it is because I take it in and out all the time, the rubber has just stretched out, especially at the bottom where it is really thin. It annoys me more then anything.

          Comment


          • #6
            For the speedo to be correct don't you have to program the ECU for rear gear then VSS input gets calc. to correct speed?
            sigpic
            1998 Trans Am Convertible A4 - WS6 hood, WS6 air lid, WS6 rims, drilled/slotted rotors.

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            • #7
              Originally posted by Plum Nuts View Post
              For the speedo to be correct don't you have to program the ECU for rear gear then VSS input gets calc. to correct speed?
              Hmmm...good question...do you?

              Hadn't thought of that...
              Originally posted by Redd8407
              I WANT NOISE! SPEED! AN ENGINE THAT SHAKES MY INTERNAL ORGANS LIKE THEY GOT PARKINSON'S! I DONT WANT AN ENGINE THAT IS PARTIALLY POWERED BY MY LAPTOP BATTERY!
              Originally posted by Z28ISGR8
              WHY THE F*CK IS THERE A GOAT ON A FERRARI?
              Originally posted by Darren
              I think it is because I take it in and out all the time, the rubber has just stretched out, especially at the bottom where it is really thin. It annoys me more then anything.

              Comment


              • #8
                I went from 3.90s to 4.10s and my speedo still is correct. I even went down the freeway and drove 60 MPH between mile markers and it was spot on.

                Comment


                • #9
                  Originally posted by jj_macdragracing View Post
                  what are u doing with the 3;73's looking to but some??
                  Shits broke... think the gears might be toast, if they are ok, ill send you a PM

                  Originally posted by Plum Nuts View Post
                  For the speedo to be correct don't you have to program the ECU for rear gear then VSS input gets calc. to correct speed?
                  Yes the ECU must be re-programmed for the changing of the gear ratio. (in order for the speedo to be correct)
                  sigpic
                  2004 Cummins 3500 4x4 QCSB Auto, 5" Exh, CAI, 20" GunMetal7s, 35" Goodyears, Fender Flares

                  ----------

                  03 Z71 Loaded, Bose, Htd leather, etc
                  (Sold)
                  00 Camaro Z28 M6 T-tops (Sold)
                  00 Camaro SS A4 T-tops (Sold)
                  99 C5 Corvette M6
                  (Sold)
                  98 Camaro Z28 A4 Coupe
                  (Sold)
                  98 Camaro Z28 A4 T-tops
                  (Sold)
                  96 Cummins 4x4 36lbs boost
                  (Sold)

                  Comment


                  • #10
                    Originally posted by 1BADAIR View Post
                    3.73 @ 70 =2400
                    3.42 @ 70=2200
                    thx

                    Originally posted by MunsterZ28 View Post
                    speedo will slow down

                    thx
                    sigpic
                    2004 Cummins 3500 4x4 QCSB Auto, 5" Exh, CAI, 20" GunMetal7s, 35" Goodyears, Fender Flares

                    ----------

                    03 Z71 Loaded, Bose, Htd leather, etc
                    (Sold)
                    00 Camaro Z28 M6 T-tops (Sold)
                    00 Camaro SS A4 T-tops (Sold)
                    99 C5 Corvette M6
                    (Sold)
                    98 Camaro Z28 A4 Coupe
                    (Sold)
                    98 Camaro Z28 A4 T-tops
                    (Sold)
                    96 Cummins 4x4 36lbs boost
                    (Sold)

                    Comment


                    • #11
                      Bill, what's it doing to think they are broke?

                      Comment


                      • #12
                        It makes horrible noises when coasting down from 25mph - 0
                        Like "wamp wamp wamp wamp ting ping wamp"


                        I'm going to open up the axle this weekend, it's already been swapped out for a new used axle..... I'm planning on fixing it and keeping it for a backup again,
                        sigpic
                        2004 Cummins 3500 4x4 QCSB Auto, 5" Exh, CAI, 20" GunMetal7s, 35" Goodyears, Fender Flares

                        ----------

                        03 Z71 Loaded, Bose, Htd leather, etc
                        (Sold)
                        00 Camaro Z28 M6 T-tops (Sold)
                        00 Camaro SS A4 T-tops (Sold)
                        99 C5 Corvette M6
                        (Sold)
                        98 Camaro Z28 A4 Coupe
                        (Sold)
                        98 Camaro Z28 A4 T-tops
                        (Sold)
                        96 Cummins 4x4 36lbs boost
                        (Sold)

                        Comment


                        • #13
                          any reason your going to 3:42 and not back to a 3:73? I'd love to get 3:73 in my car...
                          sigpic
                          1992 Chevy Camaro 25th Anniversary-SOLD
                          1992 Chevy Camaro 25th Anniversary
                          1997 Chevrolet Corvette

                          The Original
                          Originally posted by meissen
                          I actually agree with Darren on everything he said...
                          Originally posted by 81DaytonaPaceCar
                          Yep, pretty much...not too often I agree 100% with Darren, but there it is...


                          Comment


                          • #14
                            The interesting thing is that I swear 97+ speedometers are able to self-calibrate. My 94 speedometer was 5 mph off when I changed my rims and tires, but when I put the 97+ instrument cluster in, it was dead on after I drove around for awhile. Even after the LT1 swap, I don't think Steve ever changed the tune for the gear ratio and size tires to calibrate my LT1 speedometer but it reads perfectly - drove by the radar screen on Adams between 15 and 16 Mile Rd and it matched.
                            - Brian Meissen
                            Owner, MiFBody.com
                            Administrator, LTxTech.com


                            1994 Camaro LT1 Transplant - 357ci LT1, cammed, stalled, and driven.
                            2022 Camaro LT1 - "Cherry Bomb 2"
                            Michigan FBody Meet & Greet Car Show 2022
                            June 4th, 2022 - 9am to 3pm!!!
                            The HUB Stadium, Auburn Hills, MI

                            Comment


                            • #15
                              Originally posted by b.lee View Post
                              Shits broke... think the gears might be toast, if they are ok, ill send you a PM



                              Yes the ECU must be re-programmed for the changing of the gear ratio. (in order for the speedo to be correct)

                              Yeah a Hyper tech power programer will reprogram the ecu. Just select the rearend you have. It's a handy little device. Best $339.00 I've spent.

                              Rick
                              Never complain,Never explain.

                              Member Eastern Michigan Camaro Club

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