Hot Rods 34 to 39 driveline swap

I have a complete, restored driveline out of a 39 ford coupe. I would like to put it in my 34 Ford P/U. the pickup wheelbase is 6 inches shorter than the coupe. Can I bolt the 34 torque tube and driveshaft to the 39 rear end?

 

The 34 tube will not fit the 39. Not too hard shorten the 39 tube and shaft. Note that the tube length of the shortened 39 will not be the same as the 34 as the 39 center section is longer. The 39 spring can be ground to fit the 34 crossmember.

 

Yep, easy as that. Lots of small details that have been covered by different threads on the HAMB, but let us know which particular piece you don’t understand and we’ll get you a description.

 

That should be a easy swap and cutting the torque tube and shaft will be the hardest items.
You will have to change the mount on the transmission to a 33-34 style mount. Some folks call this a top hat mount and kinda like a 32 but with ears. Then I would slide the motor and transmission into the truck. This will give you the location for the motor mounts. The motor mounting can be accomplished with simple rubber brisket mounts. The rearend spring will need to be ground to fit the curved crossmember. So you grind the spring to fit the crossmember and mount the rear minus the torque tube and inter shaft.

 

Would the simple 6 to 10 spline drive shaft coupler speedway sell allow him to use the original 34 TT?

 

The length of the pinion spline end is longer, so some driveshaft shortening would need to be done anyway. I’ve never tried the bolt pattern of the 32-34 torquetube vs. the 35-48. But it will still be too long, so not saving time there either.

 

That’s a interesting question and can it be a bolt together no modifications. I’m cleaning up the shop right now and have a 1934 banjo in front of me right now and torque tube . I check the catalog and says gaskets are the same 32-48 but no visual check yet.

 

The bolt pattern on the torque tube/center section of each rear end is the same. Being that the pinion double cup is smaller on the '34 than the '39, the torque tube inner diameter is smaller on the '34 and would bind the pinion ***embly if mounted to the '39.

 

So the inter diameter is different on the banjo rear torque tube? The 33-34 is just over 2.5 inches ID do you know the dimensions of the 1939

 

The '39 double cup is 3.151" so the '39 torque tube inner diameter would be slightly less than that. The torque tube clamps the double cup into the center section.

 

Thanks to all who replied. I think when I get everything in one place, I will start by dis***embly and measuring. I have worked on these drivelines, but never done any swapping. We shall see what transpires. Maybe I have enough parts stashed to make it work.