drive shaft question

[furby714]

Hello i have a driveshaft question would a 1950 mopar with a gyromatic transmission drive shaft fit on a 1949 plymouth with a 3 on the tree ??? Thanks in advance for all ur help

[Young Ed]

Hello i have a driveshaft question would a 1950 mopar with a gyromatic transmission drive shaft fit on a 1949 plymouth with a 3 on the tree ??? Thanks in advance for all ur help

I believe it will. Dad and I swapped an Overdrive(same length as your standard 3spd) in the place of a gyro. The 2 were about 1/2" diff and the same driveshaft fit.

[Dodgeb4ya]

X2.

[_shel_ny]

Watch the term "MoPar"  as you could come up short.  Now,....... if Chrysler and DeSoto did not use a Gyromatic then you should be good. These measurements may help.

 

 

Column 1   Plym

 

Column 2-3 Dodge

 

Column  4 DeSoto  6cyl

 

Column   6   Chrysler   6 cyl

[furby714]

Thanks for all help greatly appreciated

[furby714]

Ooo well the drive shaft is of a dodge

Watch the term "MoPar" as you could come up short. Now,....... if Chrysler and DeSoto did not use a Gyromatic then you should be good. These measurements may help.

Column 1 Plym

Column 2-3 Dodge

Column 4 DeSoto 6cyl

Column 6 Chrysler 6 cyl

[Dodgeb4ya]

DeSoto and Chrysler shafts/U-joints are totally different than 1949-52 Plymouth and dodge which only use the Ball and trunnion style U-joints.

[furby714]

DeSoto and Chrysler shafts/U-joints are totally different than 1949-52 Plymouth and dodge which only use the Ball and trunnion style U-joints.

so if the drive shaft is off a dodge it should fit on a plymouth right ???

[plyroadking]

I don't know if its out of the question for you, but some of the best money i spent on the car was for a shop to build a new modern style drive shaft for my '40. ended the vibrations and clunking, 75k miles later and never had to do anything but grease it, plus when the u joints wear out i can get a new set with my happy meal at McDonald's.

[Lloyd]

I don't know if its out of the question for you, but some of the best money i spent on the car was for a shop to build a new modern style drive shaft for my '40. ended the vibrations and clunking, 75k miles later and never had to do anything but grease it, plus when the u joints wear out i can get a new set with my happy meal at McDonald's.

 

Hey plyroadking, how did you get the 'new modern' u-joints to fit the rear end and trans?

[martybose]

Hey plyroadking, how did you get the 'new modern' u-joints to fit the rear end and trans?

It's easy, they have bolt on adapters.  My 47 actually has a driveshaft that MOPAR made in the early 50's that had both adapters and a "modern" univeral joint driveshaft with a slipjoint as a retrofit kit.

 

Marty

[_shel_ny]

so if the drive shaft is off a dodge it should fit on a plymouth right ???

see post 4

[Lloyd]

Shel_ny it looks to me like the 49-52 w/o overdrive was the same between dodge and Plymouth.

 

It's easy, they have bolt on adapters.  My 47 actually has a driveshaft that MOPAR made in the early 50's that had both adapters and a "modern" univeral joint driveshaft with a slipjoint as a retrofit kit.

 

Marty

 

I can see a bolt on adapter at the rear end but how do you modify a flange with emergency brake assembly at the rear of an early model trans to accept a slip joint? Unless its a bolt on female to the existing flange that accepts the yoke..?

[Dodgeb4ya]

I just had a complete end to end bolt in modern U-joint driveshaft made to replace the old double ended ball and trunnion style shaft.

Installed it in a customers 1942 dodge pick up. Direct bolt in to the original trans and rear end pinion yokes.

$385.00 my cost though

Bob

[meadowbrook]

I tried something similar in my d34 and they could not keep it from vibrating so I returned to my ball and trunnions and called it good enough. A little vibration at 60 but that's it.

[martybose]

Shel_ny it looks to me like the 49-52 w/o overdrive was the same between dodge and Plymouth.

 

 

I can see a bolt on adapter at the rear end but how do you modify a flange with emergency brake assembly at the rear of an early model trans to accept a slip joint? Unless its a bolt on female to the existing flange that accepts the yoke..?

The slip joint is about a third of the way from the front of the driveshaft.  The adapter for the transmission is exactly like the one for the rearend.

 

Marty

[plyroadking]

Here's how mine was done, i believe it was also around $400

[Ulu]

I had one build like plyroadking shows above. It cost me $300 in 1985. Worth every penny, and the whole thing was less that the cost of an OEM pair of trunnion joints with cups and gaiters.

Edited November 14, 2014 by Ulu

[Lloyd]

Thanks for the pics plyroadking. That explains it.

I will be placing an R7 OD in down the road and looks like I will need to shorten the drive shaft when it goes in. This looks like a good idea, so may as well do this as well.

Who or where did you get this done? It would be better to get with a shop that has done this and knows what I'm asking for.

[plyroadking]

I had a shop in Sacramento build it 8 years ago, i googled build driveshaft texas and several places popped up that build them.

[Lloyd]

Yep I see em, thanks again.

[Dodgeb4ya]

Here's how mine was done, i believe it was also around $400

Same shaft I have made up for some of my customers cars.

[ROB-PA]

Somewhere in my wandering research for parts I came across someone that would rebuild the existing old Mopar driveshaft with modern U joints or make a custom length drive shaft. I believe the y were in West Virginia but I can't recall where I came across this. Is anyone familiar with these guys?

[furby714]

Still searching for a drive shafts for my 49 deluxe

[Dodgeb4ya]

The 1950 dodge W/ Gyro-Matic was the one that would have fit.