C2 speedometer drive gears in transmission HELP

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  • Al R.
    Very Frequent User
    • July 1, 1988
    • 687
    #1

    C2 speedometer drive gears in transmission HELP

    Anyone know if the plastic speedometer drive gears in a 4 speed will also work in the Powerglide transmission, Also, is the steel driven gear that mounts on the shaft inside transmission the same for a 4 spd and Powerglide? Looking to solve a speedometer issue the needle is sluggish on "above normal" acceleration and also drops down when passing gear is kicked in. I had the speedometer rebuilt and just rechecked and it was found to be OK. Also, have a new cable assy. installed. It was suggested to check these 2 gears for the possible source BTW, the powerglide was rebuilt during the car restoration, however, it sat wrapped in my shop for a # of years during the long restoration. The rebuilder is now deceased. TIA AL
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    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43129
      #2
      Re: C2 speedometer drive gears in transmission HELP

      Originally posted by Al Rains (13251)
      Anyone know if the plastic speedometer drive gears in a 4 speed will also work in the Powerglide transmission, Also, is the steel driven gear that mounts on the shaft inside transmission the same for a 4 spd and Powerglide? Looking to solve a speedometer issue the needle is sluggish on "above normal" acceleration and also drops down when passing gear is kicked in. I had the speedometer rebuilt and just rechecked and it was found to be OK. Also, have a new cable assy. installed. It was suggested to check these 2 gears for the possible source BTW, the powerglide was rebuilt during the car restoration, however, it sat wrapped in my shop for a # of years during the long restoration. The rebuilder is now deceased. TIA AL

      Al------


      Powerglide speedometer gears, both drive and driven, were the same as those used for T-10 and most Muncie 4 speed transmissions (except 71-74 Muncie drive gear).
      In Appreciation of John Hinckley
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        • Al R.
          Very Frequent User
          • July 1, 1988
          • 687
          #3
          Re: C2 speedometer drive gears in transmission HELP

          Thanks Joe, that part is good. At least I will have a source.
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            • Joe R.
              Extremely Frequent Poster
              • August 1, 1976
              • 4546
              #4
              Re: C2 speedometer drive gears in transmission HELP

              Al,

              Yes, that is good. Take the gear out and see what color it is and count the teeth. May be the correct number of teeth but the overall diameter could be smaller than your drive gear can engage all the time. Acceleration could cause an overload and the gear could be snapping over a couple of teeth.
              Let use know what happens.

              JR
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                • Al R.
                  Very Frequent User
                  • July 1, 1988
                  • 687
                  #5
                  Re: C2 speedometer drive gears in transmission HELP

                  Joe, may be a week or so, It will most likely be next weekend before I can get the cluster assy back in the car. I'm going to get the gear out tomorrow, hopefully, and then see what shape it's it and probably order a new one to try. I'm hoping to be able to see the steel gear with mirrors, but not sure this will be possible. Will keep you updated.
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                    • Al R.
                      Very Frequent User
                      • July 1, 1988
                      • 687
                      #6
                      Re: C2 speedometer drive gears in transmission HELP

                      I got the cluster back in yesterday and took the car for a spin. I'm still having the lagging speedometer needle issue when accelerating slightly above normal or faster and the issue with the needle dropping down when kicking into passing gear. The needle will go to the correct location when the speed stabilizes at a steady pace. (might add that the speedometer is approximately 3 MPH slow when compared with my GPS). The plastic drive gear was pulled from the transmission and found to be in great shape. A visual inspection of the metal gear inside the trans through the opening in the tailshaft did not reveal any damage on the gear. It appeared to be centered on the shaft in the hole opening. The plastic drive gear is the correct 20 tooth blue one specified for the 3:36 read gear. I also re-installed the original drive cable and housing in an attempt to eliminate the repo cable as a possibility. BTW it is a Powerlide trans. Any other help or suggestions are appreciated. Will changing the plastic gear to one with 1 more or 1 less tooth correct the speed difference between the speedometer and the GPS? Thanks, Al
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                        • Joe L.
                          Beyond Control Poster
                          • February 1, 1988
                          • 43129
                          #7
                          Re: C2 speedometer drive gears in transmission HELP

                          Originally posted by Al Rains (13251)
                          I got the cluster back in yesterday and took the car for a spin. I'm still having the lagging speedometer needle issue when accelerating slightly above normal or faster and the issue with the needle dropping down when kicking into passing gear. The needle will go to the correct location when the speed stabilizes at a steady pace. (might add that the speedometer is approximately 3 MPH slow when compared with my GPS). The plastic drive gear was pulled from the transmission and found to be in great shape. A visual inspection of the metal gear inside the trans through the opening in the tailshaft did not reveal any damage on the gear. It appeared to be centered on the shaft in the hole opening. The plastic drive gear is the correct 20 tooth blue one specified for the 3:36 read gear. I also re-installed the original drive cable and housing in an attempt to eliminate the repo cable as a possibility. BTW it is a Powerlide trans. Any other help or suggestions are appreciated. Will changing the plastic gear to one with 1 more or 1 less tooth correct the speed difference between the speedometer and the GPS? Thanks, Al
                          Al------


                          You're probably about as close as you're going to get with speedometer driven gears. If you were to change gears even by 1 tooth you'll probably "over correct". Absolute, dead-on accuracy with stock speedometer gears is more of an accident than something to be expected.

                          As far as your speedometer problem is concerned, I still think it's in the speedo instrument.
                          In Appreciation of John Hinckley
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                            • Joe L.
                              Beyond Control Poster
                              • February 1, 1988
                              • 43129
                              #8
                              Re: C2 speedometer drive gears in transmission HELP

                              Originally posted by Al Rains (13251)
                              I got the cluster back in yesterday and took the car for a spin. I'm still having the lagging speedometer needle issue when accelerating slightly above normal or faster and the issue with the needle dropping down when kicking into passing gear. The needle will go to the correct location when the speed stabilizes at a steady pace. (might add that the speedometer is approximately 3 MPH slow when compared with my GPS). The plastic drive gear was pulled from the transmission and found to be in great shape. A visual inspection of the metal gear inside the trans through the opening in the tailshaft did not reveal any damage on the gear. It appeared to be centered on the shaft in the hole opening. The plastic drive gear is the correct 20 tooth blue one specified for the 3:36 read gear. I also re-installed the original drive cable and housing in an attempt to eliminate the repo cable as a possibility. BTW it is a Powerlide trans. Any other help or suggestions are appreciated. Will changing the plastic gear to one with 1 more or 1 less tooth correct the speed difference between the speedometer and the GPS? Thanks, Al

                              Al------

                              The 20 tooth blue driven gear is the correct one for Powerglide with 3.36:1 rear gear. Assuming the tires on the car are the same OD as the originals, your speedometer should be as accurate now as it was when it left the factory.
                              In Appreciation of John Hinckley
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                                • Al R.
                                  Very Frequent User
                                  • July 1, 1988
                                  • 687
                                  #9
                                  Re: C2 speedometer drive gears in transmission HELP

                                  Dave & Joe, it's about 4 under at 25-40 MPH and then around 3 under from 45 up to around 65. Tires are 205-75-R15 Uniroyal. My wife, who will mainly driving the car, told me she had rather have the speedometer register 2-3 MPH fast than slow. As I usually push for the extra 3-4 MPH over the speed limit (which law enforce usually allows), I'm afraid I might relax and go too much over with a slow speedometer and receive the un-welcome ticket. I guess it's just a matter of preference.
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                                    • Gerald C.
                                      Extremely Frequent Poster
                                      • July 1, 1987
                                      • 1254
                                      #10
                                      Re: C2 speedometer drive gears in transmission HELP

                                      Can someone tell me how I determine the diameter of the steel drive gear inside the transmission? I counted 4 "gears" from the speedometer cable opening. I'm trying to determine the correct nylon drive gear for my 63 3:55 rear end with 670/15 tires.

                                      Thanks
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                                        • Bob R.
                                          Extremely Frequent Poster
                                          • July 1, 2002
                                          • 1594
                                          #11
                                          Re: C2 speedometer drive gears in transmission HELP

                                          Jerry
                                          with a 3:55 rear differential I believe the correct gear is green. There are two possible steel gears in the transmission one is for 3:08 to 3:55 and the others is 3:70 to 4:56. The green gear will work if you have the correct steel gear in the transmission if not you will have to change the steel gear.
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                                            • Gerald C.
                                              Extremely Frequent Poster
                                              • July 1, 1987
                                              • 1254
                                              #12
                                              Re: C2 speedometer drive gears in transmission HELP

                                              Bob,

                                              According to the LICC Section 32-63 (3.08 to 3.55) indicates that I would need the red (21 tooth) gear for my 3.55 (32-63D). Thoughts?

                                              The section 32-64 is for 3.70-4.11 gears.

                                              Thanks
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