nate_o23

Just wondering if this is possible. Can I take a dodge 47RH with the 28 spline output shaft and swap in an output shaft from a jeep 727 with 23 splines??

scottmn1

It might take atransmission guru on here for your 100% certain answer, but I believe that since the 47 RH has a lock up torque convertor it has a different numper of splines and the end of the output shaft is different. I would want to have that verified before taking it as gospel though.

Fred Swanson

The output shaft from a 3 speed 727 won't be the same as the 4speed(OD) 47RH shaft.

JD730

What 47RH has a 28 spline output shaft? My 4x4 one has a 23 spine output shaft.

What exactly are you trying to do and are these transmissions 4 wheel drive or 2 wheel?

nate_o23

I was under the impression that 47 RHs were 28 spline but I could be wrong. What I am trying to do is mate a 4bt to a 47rh and then attach that to the 23 spline np229 in my wifes jeep grand wagoneer. If dodge made a 23 spline shaft thats is the same as jeeps that would make life ALOT simplier!
JD730-what year is your 23 spline 47rh?? is it 4x4? Thanks

JD730

My 47RH is out of a '95 truck, all 4x4 47RH's are 23 spline. It is a 4 wheel drive model.

I'm gathering the jeep has a 727 in it now. It should have a 6 bolt circular pattern. Don't take this as gospel, but your transfer case should bolt up to a 47RH.

Fred Swanson

Let me help to clarify. The 47RH output shaft is 23 spline, yet the output shaft length makes for a different TC input just for these 47RH trannies available in 94-95. The TC bolt pattern is a 6 bolt circle, too.

You'd need to measure the TC input shaft neck of both TC's, and also measure the TC mounting flange., they may be different. It may bolt up, but only one way to know for sure.

TIMMY22

remember a diesels "rpms" are much lower than a gasser. A gas transmission/transfer requires much more "rpms" to reach a certain speed.

when was the last time you reved your cummins up to 4500 rpm?

Are you just trying to swap the shaft into your existing tranny or your shaft into another tranny?

JD730

Whoa Fred, the output shaft has nothing to do with the TC input, the input shaft on a 47RH is hollow and has 1 less or more spines on the shaft so it won't take a non-lockup converter. If we where to look at a 1st gen A518 and a 2nd gen 47RH from the output shaft side there is no difference that really stands out. In fact the overall length of the transmission case is the same for both of them, the difference is in the bellhousing adapter that is an inch thicker to make room for lockup clutches and some internal plumbing and valve body to accommodate the hollow input shaft.


nate_o23,
Find yourself a diesel 47RH (47RH's should have only been for diesels and V10's, if you get a V10 47RH you need to change the governor in the OD section), bellhousing, flexplate and bolt that right to your 4BT and have some fun. Make sure your transfer case has an 6 bolt circular pattern.

JD730

Too early, brain to functioning fully yet, silly me .

Dangit, 8 bolts are wrong, I just found the pics of my transfer case, its 6 bolt. Must be thinking of something else.

nate_o23

OK, I am probebly wrong about the 28 splines (wouldnt be the 1st time I was wrong ) So just to make sure I have this right, the 47 RH output shaft is 23 spline with a 6 bolt patern?? Im not sure of the NP 229s bolt pattern but it is 23 spline so at least I have that going for me.