Replacement driveshaft

Alan that looks like what I'm looking for, I've got one local guy to talk to that has one. Let me get with him first since I've asked and I'll get back to you. Thanks, Greg.
 
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I'm tossing out ideas, it has been a long time since i've looked at the two transmissions. Will the '50 non_OD shift cover fit the '53 OD trans? You might have to move the 1st/rev shift lever with the reverse lock-out over to the non-OD cover.
 
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The 53 trans is 1.5" longer than the 50, I didn't want to cut my driveshaft in case I wanted to go back to the stock unit. From what I've learned here and from the local flat head era guys the internal parts of the r-10 should interchange, if I can get a complete unit the one I have now will be spare parts.
 
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The parts ONLY interchange between transmissions with the same type of gears. The change was in 1951. Ford changed over to what is referred to as the diamond pattern gears. Some have odd numbers on the input shaft too so I wouldn't plan on interchangeability between 1949/50 and the later gear sets. There might be a couple of parts that interchange but don't count on anything substantial.

The 1951/53 transmissions were stouter than the earlier ones but you always find other stuff like the clutch mounting provisions that muck things up for a swap.
 
Thanks, I remember you posted that earlier. These came along before my time, my first transmission repair was a Muncie four speed, I broke several in my younger years.
 
rotor wrench is correct as usual, you have to know for a fact its a 51 or later, they look the same on the outside, gear cut and tooth count are different inside
 
The local man has two transmissions and is going to sell me one, thanks to everyone that helped on this.
 
I got the overdrive transmission installed today, everything went well. I had to make clearance for the solenoid but not much, I also had to weld a extension on the mount. My trans is a 51 which uses a wider mount than the 49-50 and the mount is one inch farther forward than the stock unit. Overdrive is what my car needed all along, its barely above idling at 55 mph.
 
I haven't took it out of O.D. since I installed it, from what I've read some say theirs lugs or lacks power, mine pulls good so I'm ok. I'm not totally satisfied with the mount I made so I'm planning a different approach.
 
If you can find one, replace your cross member with one out of a '51. It's a bolt in in a 49 or 50 and accepts the wider mount.
 
I've been thinking about doing that,seeing you have a 51 as your avatar do you happen to have a picture of the mount area or do you remember how it mounts? The 50 mount sits on top of the member, the 51 mount has to have a offset weld to it to keep the transmission at the correct ride height. I measured the distance from the center of the output shaft of my old unit to the center of the tunnel before removing it and duplicated it when making mount adjustments, the 51 mount in stock form raises the trans too much, it hits the floor plan.
 
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