Speedometer Gears Info Needed

Unknown
Unknown
edited November -1 in HUDSON
Has anyone ever tried putting in different DRIVE AND DRIVEN gears to correct a speedometer when putting a late model rear end in a 30's car ? Putting a 3:07 in my 37 Terraplane. Drive and driven gears are such that a given drive gear will operate several driven gears. The 37 DRIVE gear is .985 I.D. X 1.940 O.D. X .750 wide , no inner splines and held secure by just the tension against it. If anyone has a DRIVE gear and or driven gear they would part with from a car that had a 3:07 rear or close to it I'd like to give it a try. I think the O.D. would be the only critical factor, width and I.D. could be built up/machined down to size. Thanks, BUD

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  • Jon B
    Jon B Administrator
    Since 3.07 was not a factory option in '37, there might not BE any gears available for that praticular transmission. This wouldn't preclude you from making them (with a the help of a good machinist), I'd think. I've also heard of universal gear reductions that can be attached to the transmission and adjusted to fit the ratio, but have never checked them out.
  • Unknown
    Unknown
    Jon B wrote:
    Since 3.07 was not a factory option in '37, there might not BE any gears available for that praticular transmission. This wouldn't preclude you from making them (with a the help of a good machinist), I'd think. I've also heard of universal gear reductions that can be attached to the transmission and adjusted to fit the ratio, but have never checked them out.
    ---- HI JON, I've used the adapter gidgys, they work fine and have a whole mess of little gears in them that are arranged/re-arranged to correct a reading. Am wanting to try something likely not done before, might get lucky and later gears can be made to work .
  • [Deleted User]
    [Deleted User]
    37 Terraplane#2 wrote:
    Has anyone ever tried putting in different DRIVE AND DRIVEN gears to correct a speedometer when putting a late model rear end in a 30's car ? Putting a 3:07 in my 37 Terraplane. Drive and driven gears are such that a given drive gear will operate several driven gears. The 37 DRIVE gear is .985 I.D. X 1.940 O.D. X .750 wide , no inner splines and held secure by just the tension against it. If anyone has a DRIVE gear and or driven gear they would part with from a car that had a 3:07 rear or close to it I'd like to give it a try. I think the O.D. would be the only critical factor, width and I.D. could be built up/machined down to size. Thanks, BUD
    Take your car to a speedometer repair shop that has a dyno and they will adapt a little transmission to your transmission and hook up your speed cable to it and you are all set. When I installed my 2:73 gear ratio in my 53 Hornet, this I did and no problems. They will issue you a slip showing before and after speeds. Cost me $90.00. Walt.
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