55T-Bird question again, The cable is new , has lubrication , the gear looks like is not fully engage , 3-4 teeth gets chew up enough so is not engage any more , what is the correct # of teeth to use

5

Asked by Jul 19, 2016 at 04:06 PM about the 1955 Ford Thunderbird

Question type: Maintenance & Repair

The cable is new , has lubrication , the gear looks like is not fully engage , 3-4
teeth gets chew up enough so is not engage any more , what is the correct #
of teeth to use ? I've used a 19 tooth ...and  20 tooth , works for 2-3 weeks ,
then stop, same problem, do any one know if they made a metal gear .

3 Answers

92,555

Here is some things to check, first the speedo drive gear in the transmission, any pitting or burrs will shorten the driven gears life dramatically, next is the speedometer itself, make sure there is virtually no drag in the head itself as this can and does increase the load on the cable and that transfers directly to the driven gear shearing off the teeth, next make sure the cable is smooth in it's way to the speedometer, nice easy curves. HTH

5

Hi Tennisshoes, Thanks for your help , that's what I'm afraid of , having to drop the transmission to get to that gear . I have investigate that gear by putting my finger to feel if any wear or play , can not tell. Thanks again, Gordon Ng

92,555

I don't know what trany you have but normally you can just pull the tailshaft housing off to get the the drive gear, you will have to block it to relieve stress on other mounts. HTH

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