727 motor home trans or reg. 727

[tgullionsr]

I have both, would it be better to rebuild m-home and change tail shafts or just rebuild the car 727?

 

[mopar 3 B]

Can you furnish the transmission number. Found on the drivers side of transmission pan rail. We have no idea what transmission you are asking about without it. You will need to know if parts are compatable what year is the motor home transmission and the one you going to use for parts to change the tail shaft.

 

[Bb70charger500]

If your rebuilding both why would you even bother with the motor home trans ? Just rebuild the car one .
Am I missing something?
Is one for big block and one small block ?

 

[gdrill]

I've heard they may have more clutches and also a 4 gear planetary system instead of the normal 3 gear. The tail shaft is short though. But if you are rebuilding, you can take it off the other. Or maybe the planetarys can switch bodies. I'm not 100%, just remember hearing this somewhere.

 

[Northern Runner]

Motorhome transmissions don't have a rear slip yoke but otherwise internally they're like a HP car trans that you might find behind a HP 383 or a 440. You could swap out some of the stuff from the motorhome trans into the car trans and beef it up a little bit.

 

[mopar 3 B]

But you will need to know what years your transmissions are so that you use compatible parts.

 

[tgullionsr]

I have both, would it be better to rebuild m-home and change tail shafts or just rebuild the car 727?

M-home is 78 for 440, the car is from I think early 70's model big block. Sorry for not putting all info in original post.

 

[mopar 3 B]

TheThe input and output shafts are not compatible. But I believe the rear 4 plantitary carrier will work with the older shaft. Please post a correction if anyone know's of a reason that will not work. Everything will fit into the car case.

 

[theman440]

The splines on front planet (and mainshaft) are different between those years. If it is a street car the "car" trans will be fine, just rebuild with a TransGo shift kit...yeehaw!

 

[TetanusShot]

I did this exact swap a couple years ago. I used the car tail shaft and tail shaft housing. Everything else came from the motorhome transmission including that special four planetary gearset. 8500 miles later everything still works fine. The motorhome trans was a '73 and the car trans was a '76 I think.

hope this helps good luck

 

[383man]

What are you going to use the car for it goes in ? I mean is it just a cruiser or will you race it. My 727 is a standard 3 pinnion trans that I built with basically all stock parts and it has been in my car since 2006 and holding up fine. And I race it some as it runs in the 10's. I just use a reverse manual valve body and a bolt in overrunning clutch (rear sprag). I also blocked the accumulator and us a Dynamic 9.5 converter. If you dont plan to race it and only use it as a driver any standard 727 will work fine. If you are going to make alot of power and do some serious racing then I would want to beef it up more. I know I raced a few 11 second cars with basically stock 727's that have held up fine. But if your going to race alot I would also upgrade the front drum just so you dont have to worry about it grenading. Ron

 

[TekHousE]

But you will need to know what years your transmissions are so that you use compatible parts.

No you don't. There is virtually NO difference from the early 727's until the later model ones.

If you use the motor home one, all I would say is to buy the transgo REPROGRAM kit TF-1. There are mods needed on just about EVERY 727 no matter what they came out of, to make them shift firmer and faster.

I just modded my original '66 727. We were able to add more clutches and steels, using a combination of different thickness paper, raybestos and red eagle, clutches. It was easy to add more to my trans. we machined the retention plate so that we could pack 6 clutches and steels into one drum and 5 in the other. The result of this is a tranny that can handle way more torque, as adding clutches increases torque and clamping load exponentially. so going from 4 to 5 is a 25% increase, from 4 to 6 is a 50% etc.