The Stovebolt Site Forums The Shop Area Driveline Speedometer gear stripped

And as fate would have it I had thought I wouldn’t find something so I hacked up the u-joint. One step forward and one step back.

Doug, The set you bought is meant for the 4.11 rear axle ratio so you will need to find an adapter to change the output ratio to mimic the 3.90 gear set. Too late tonight for my head to wrap around that math.

Perhaps Twin Jimmy's can shed some light on what adapter your would need to gain better speedometer accuracy?

I might be easier to use an adapter with whatever gear combo you can come up with than to search for a specific gear-set.

In my ramblings around I have found various speedometer drive adapters to compensate for tire sizes, gear ratios etc. A dear departed friend had a couple of boxes of these from the trucking company we worked at. They could be opened and various combinations of gear sets installed and screwed back together again. He had a couple dozen of these spur-gear sets, so you could add or subtract just about any % you wanted. There are no doubt others of these things floating around. I'll check with his widow next time I'm in the city.

Aside from that there are current production adapters available for selected % changes. I think Jim Carter will have them made up to order. IIRC they were about $70 last I looked. Other vendors sell them as well.

If anyone knows who sells speedo cables that are way long I'd like to know. I need one to go from the speedo to the brownie so I don't have to calculate speed from the tachometer. In some gear combinations the speedo driving off the main box is accidentlly correct but it would be nice to have it correct all the time.

While I’m waiting on the speedometer gears I buttoned everything up to check that it would drive so I can order glass and such to move forward.

It moves in forward gears but won’t go in reverse. What would cause that. I had checked it before hooking up the torque tube and it went into reverse and the u-joint turned in reverse. lol

Doug

Did you have the top cover off of the transmission

If you had the cover off there is the two forks to line up as well as the leaver if I remember correct

Yes I did. But I had it back on when I checked to make sure the rear yoke turned and stopped when I pushed the clutch in. All gears and reverse worked then. Now reverse acts like it is pulling forward.

Doug

The reverse shifter fork is separate, and if you didn't get it engaged correctly, that could explain not going into reverse. It may have been partially engaged enough to work once. I'd pull the top cover and recheck that.

That was what I was thinking also Kevin. Working today and tomorrow so may be a couple days.

Doug

Update.
Pulled the tranny lid and checked everything. Looked good. Still didn’t go into reverse.
Pulled the lid off again and everything looked good so put it back on to try again. Still no reverse. Then as I was going to go back into 2nd to run the gears again I was a little off and as I wiggled it reverse was found. I had forgotten reverse was over and down not up. Shifter knob got me again.

Glad you figured it out Doug. Get you a new shifter knob - lol!