Engine/Transmission (1994 - 1998) 4bt Trans Options

[Silverbullet]

Hello all,



It has been a LONG time since spending time researching on this site. I have been in a never ending build of a '76 Bronco and wonder if I could ask for a bit of help.



I am wanting to put in a 4bt in the Bronco and need help with transmissions. I would like to stay with an auto and it would be nice to have OD. What transmissions would be good/reliable and available? My assumption is that any Dodge Trans will bolt up to the 4bt as would with the 6cyl but I am in battle with length and options for t-cases. Any ideas on what would work as far as Trans and/or T-cases?



I thought this would be the best section to post as the years relate the best. Any thoughts appreciated. It will be nice to get some REAL parts in my project.



Thanks in advance,



Dave

 

[fox]

What adapter plate is with it?

Most I've seen had the chevy set-up. If so I'd use a chevy 350 or the 700r4. This gives you a cable operated trans. The 400 needs vacuum to sense shift pionts.

Or you can buy a dodge adapter and use the good old 46/47rh or re trans.

 

[BJMarshall]

I used a 400 when I did mine. It worked out real nice with the adapter to connect it to the stock dana 20. It moved the transfer case back exactly the right amount to put the front driveshaft in the rear and the rear in the front. Saved a bunch on drivelines. If I had it to do over again, I would probably go with a 700 or a 47rh so I could have overdrive and lockup.

 

[Silverbullet]

What models/years would a 47RH be found? I looked on on the TCI website and the info says that that this transmission would be only 3/4" longer than my existing C-4. That would seem to be perfect.



Another question: Does anyone know the specs on the 47RH? What bolt pattern does the OEM adaptor has for a 4x4 model? How big is the output shaft diamater?



My assumption is that if I have a dodge trans that came off a Cummins than I wont need an adapter for the bell housing. Are these computer controled trans?(47RH). ATS has a conversion trans with computer and all for $$$$.



Thanks for the info thus far. Have not attempted a conversion like this and trying to do all the homework.



Dave

 

[BJMarshall]

The 4bt like the 6bt will require a flywheel housing to bolt to any transmission. The flywheel housings are specific to the type of transmission used. You need to see what is on the engine already. If you want to go with a 47rh, you will need a flywheel housing from a 2nd gen truck. I think they will all work from 94-02. You will also need the appropriate starter for the housing. The transmission can be found in 94-97 trucks. I believe 98 was the first year of the 47re. Even though the rh transmission is mostly hydraulic, TC lockup and OD are shifted electronically. If you are going to use a stock type front differential in the Bronco, you can use a t-case from a 94 up ram since both are driver's side drop. If you switch to a passenger side drop, you can use a 205 from a first gen.

 

[Willys]

The 47rh transmission was used on '94 and '95 trucks. My Jan. '96 build date truck has a 47re.



I removed the tps(controls lockup speed) on my '95 and replaced it with a potentiometer to set lockup. I'll bet there are ways around the rest of the electronic controls on an RH to make it computerless. I'm going to go for a 5 speed when I get around to doing my jeep to 4bt project.