Hey Bill, don't suppose you have a scan of the parts book for a 3-speed standard transmission with a 3.89 rear axle ratio? I was just looking at transmissions ID charts and I reckon mine is the same as in this picture:

As such, I'd be interested to see the drive and driven gear part numbers for it. Not sure what this trans is commonly referred to.

Who'd have thought this issue would have taken this long to resolve! It doesn't help that I'm in Australia, so sourcing some of these parts can be a time consuming process. I really appreciate all the input on this so far.
Cam

 

Think I've answered my own request - response #14 in the following thread:
https://www.ford-trucks.com/forums/1...ter-gears.html

 

I'm still going with this! A couple of questions:
1. How do I separate the tailshaft housing (part 7A039 in the diagram of the trans in the post above) from the main part of the transmission? I naively thought it was going to just slide off, but no. Probably should have asked this before trying to do it and breaking the synchro in the process! The only consolation out of this was that the synchro was shot, so this has forced me to address it.
2. While I've got the transmission out I'll also replace the throw out bearing as it isn't in the best shape, but what else should I replace while I've got the transmission out of the truck? It tends to leak a bit of oil, but I'm not sure from where.

Some pictures.
The gears on show, including the broken synchro and all the roller bearings. How the hell do they all go back in??


My truck originally came with a B code transmission which is a 3 speed overdrive unit, however clearly it's been swapped to a plain three speed light duty A code trans at some stage.


Thanks for everyone's help so far on this. I should've just lived with a non-functional speedo, but I couldn't let it go, and now I'm in deep...
Cam

 

I would recommend you find a chassis manual that covers that transmission because there are always little things that one needs to know. I'm going to type some of what is in this Motors manual because it's too old and fragile to scan. This should be enough information to get it apart. But there is a whole lot more to it than this.
1. Remove gearshift housing.
2. Unfasten extension housing from case and turn housing to expose the end of the countershaft.
3. Drive countershaft out thru the rear of the case with a pilot tool. When countershaft has been driven out remove tool and allow counter gear to fall to bottom of the case.
4. ( Now this is why you need to buy a book) Remove extension housing and main shaft as a unit. Some main shaft pilot bearings may drop to bottom of case when shaft is pulled rearward.

Considering all that and the fact it isn't the original transmission anyway. Plus I doubt that there are a lot of parts available for the transmission you have. I would go junk yard shopping for a good type 3:03 transmission that uses a slip yoke and has the narrow bolt pattern which is most likely what you have and swap the whole thing. You will end up with a better transmission and your speedometer should work. I also realize that Ford did things differently down there. So you probably need to do some research on that first.

 

An update to this and hopefully help someone in future. Thanks to Crop Dusters instructions, a 1959 Ford shop manual, and a YouTube video, I managed to get the transmission apart. Only problem was the speedo drive gear I bought didn't fit. I've never ever seen one come up for sale like the one I have, let alone like the one I have with a reversed thread.

Here's the link to the YouTube video: . The video was priceless, and I am extremely grateful to the original poster of it. Never thought I'd find a 29 minute transmission video entertaining, but it was!

Fair to say this was a big job. I didn't remove the counter shaft, as that seemed like unnecessary work (and I didn't have equipment handy to drive the counter shaft out). That made the job difficult, but not impossible. I also wrestled with a clip that had been installed incorrectly for a good hour. Yes, there was a fair bit of cursing going on.

The original steel gear, and the incorrect (but with correct thread direction) plastic replacement.


Here's the original mounted on the shaft.


It was at this stage that I abandoned hopes of having a working speedo, and instead replaced the synchro gear I broke, put is all back together, replaced the gaskets and replaced the gear oil. The silver lining out of this exercise is that it shifts a little better, and it doesn't appear to be leaking oil (yet!).

If anyone knows where to get a replacement gear that is threaded correctly, I am all ears. Replacing the transmission with a 3.03 transmission around these parts isn't a viable option for me unfortunately.
Cam

 

Perhaps you could have a bushing made that has the OD to fit the nylon drive gear and the ID to fit the output shaft and long enough to act as a spacer with a step to keep the nylon gear in the correct location? A lot of work I know and probably not cheap. If a 3.03 isn't available locally you could always have one shipped. Just some thoughts.