need help with trans swap

[kaptin99]

My vehicle is a 87 bronco II
I want to swap in a 302. I am changing the transfer case to a dana 20 and am not worried about driveshaft changes. I am trying to decide between a AOD and a C4. Will these both bolt up to a Dana 20 or do I have to change the tail piece or something? The motor is a 91 5.0l mustang. I think i would like to use the aod
because of the overdrive. I am just concerned about how to bolt it up to a Dana
20

 

[Mutant Pony]

The only way to bolt the AOD and the 20 together would be an adapter. The shaft splines should be the same though. The c4 came bolted to a D-20 from the factory so that is no problem.
You could comprimise and use an NP208 behind the AOD. It is a really tight fit but, it works.

 

[kaptin99]

thank you

Thank you for replying so fast. I went and picked up a c-4 today. Tomorrow my motor is supposed to be dropped off. I know what I will be doing for the next 6 months.

 

[bottledgt]

you will probably need the adapter for the c4 as well

 

[MAKG]

Not if it's an RBV C4. They came from the factory mated to BW 13-50 transfer cases.

There is the issue, however, that they are OLD. All of them. And they have no overdrive gears so the choice of rear end gearing is different.

 

[bottledgt]

yeah but arent those c5s?

 

[kaptin99]

Why would I need an adapter to hook up a dana 20 to a c4? they came factory that way.