The Stovebolt Site Forums The Shop Area Driveline Speedometer gear replacement

So in the middle of the 3:55 gear swap and discovered why my speedometer doesn’t work, the gear in the trans is tore up, looks like a U joint bolt broke at some point and was replaced and the head stayed in the houseing. Anyway since I’m changing gears does anyone know what speedo gear I need and best place to get it?

So is the problem in the driven gear. Or the one easily accessed from the outside of the transmission.

The gear below the u joint in that same housing

It would be best if you got a gear that's the same color...I'm still thinking about a T 5 transmission. Never been inside a 1/2 ton transmission.

Ian,
Both the drive gear and the driven gear are in the u joint housing. The drive gear is a circular gear pressed on to the rear of the u joint. The speedometer cable inserts into the driven gear, which can be removed from the passenger side without opening the u joint housing. To find the correct gears which transmission do you have? I am assuming also, that you are referring to your 41 1/2 half ton truck.

Kent

Ohhh ok sorry for the confusion the drive gear on the back of the joint is fine it’s the driven gear I need. Yes it’s for my half ton and I really am not for sure on what trans it is, I’m still learning those but it’s a four speed with first being a bull dog gear.

Ian,
Just to confirm your transmission type, does it have the reverse lock out for reverse? If it does, that is the stock 4 speed, non-synchronized transmission. Nobody knows what to call that transmission type, but it was used from at least 1937 up to 1947. The problem is there are several sets of speedometer gears to go with the various tire sizes as that tranny was used on all models of trucks from 1/2 ton on up. You will have to find a driven gear that matches the one you have that is damaged. For those of you not familiar with this tranny, the driven gear is steel, not plastic, so all of the various gears are the same color. You have to count teeth to identify. Can your driven gear be repaired? I am using a damaged one that was repaired by a machinist. I have at least one extra driven gear but I think it came from a larger truck that probably won't match your 1/2 ton gear. How many teeth does your damaged gear have?
Kent

It does have the lock out so it’s the stock four speed, but my gear has chunks out it it’s dead, the trans was on my old 216 that I blew and replaced with a 235 and assuming it went with that 216 it’s a 47 I think. As far as teeth let me get back to you on that, I’m doing the work at a buddy’s but I’m not there at the moment

Ian,
Don't give up on the gear just yet. I had mine repaired with teeth missing and the shaft bent. Missing metal can be carefully replaced by welding. I think my machinist Tig welded it with a hard alloy but I am not sure, followed by careful filing. It would be cheaper IF you can find one but I have been looking for another one for my '42 for a long time with no luck. You almost have to get the whole tranny and be sure it came out of a 1/2 ton.
Good Luck and give us follow up.
Kent