Dana 20 to c4

[Daveyd]

Hi all, I’m trying to get my bronco back together but I’ll be putting a c4 in instead of the stick. I also have a 302 with an aod already on it but for some reason I’m deciding not to use it mostly because I don’t want to cut up a nice original body. Anyway, I have a Dana 20 that seems to be correct for it(a68) and the c4 seems to be missing something. How can I tell? Thanks in advance

 

[jeffncs]

That’s everything…. The intermediate is still attached to the trans. after doing a thorough(!!!!) cleaning of the input and housing, move the intermediate to the D20. It’s easier to assemble in that order.

 

[thegreatjustino]

That’s everything…. The intermediate is still attached to the trans. after doing a thorough(!!!!) cleaning of the input and housing, move the intermediate to the D20. It’s easier to assemble in that order.

If that Dana 20 is from a 1968 as stated, the spud shaft is likely for a manual transmission and will be too long to use in the C4 adapter. The OP will need the correct length C4 spud shaft.

There's been some discussion here over the years regarding shortening a manual spud shaft the correct amount to work, but doing so brings up whether or not the splines in the shaft are deep enough for proper engagement to the transmission output shaft.

 

[jeffncs]

If that Dana 20 is from a 1968 as stated, the spud shaft is likely for a manual transmission and will be too long to use in the C4 adapter. The OP will need the correct length C4 spud shaft.

There's been some discussion here over the years regarding shortening a manual spud shaft the correct amount to work, but doing so brings up whether or not the splines in the shaft are deep enough for proper engagement to the transmission output shaft.

From the pics, the pieces are all there. Only way to tell is to see if it’ll all bolt together….

 

[Broncobowsher]

If that D20 was on an AOD (not sure from the wording of the post) the spline count is probably wrong. The aftermarket AOD spline count is 27 instead of the normal Bronco 28.

 

[thegreatjustino]

From the pics, the pieces are all there. Only way to tell is to see if it’ll all bolt together….

Or save a boatload of time and hassle and simply measure it with a tape measure to ensure you have the correct parts prior to assembly.

 

[Viperwolf1]

That bearing retainer is really odd. Never seen one like that. It bolts to the tcase. You have something strange going on there. Input stub shaft looks odd too.

 

[bronco italiano]

That bearing retainer is really odd. Never seen one like that. It bolts to the tcase. You have something strange going on there. Input stub shaft looks odd too.

Yes indeed. Something doesn't seem right with that T-Case

 

[Broncobowsher]

From the rustly look of the tailhousing extension, does it have "STROPPE" cast in the side of it?
The only adapters I know of that were cast iron were the Stoppe conversion of the early 70s.

 

[Oldtimer]

V8 RAN T-case adaptor housing is 9-3/8"
V8 RAT T-case adaptor housing is 8-7/8"
V8 C4 T-case adaptor housing is 7-1/2"
I6 RAN T-case adaptor housing is 6-1/2"

I6 MT output shaft is 3” shorter than the V8 MT output shaft

RAN has 2.99 1st
RAT has 3.41 1st
RAN tranny is 1/2” shorter than RAT

I6 & V8 MT use same adapter input shaft, 7-31/32 long
V8 AT uses unique adapter input shaft approximately 5/8” shorter

 

[Viperwolf1]

From the rustly look of the tailhousing extension, does it have "STROPPE" cast in the side of it?
The only adapters I know of that were cast iron were the Stoppe conversion of the early 70s.

The Ford C4 adapters were also cast iron.

In any case, I don't think that C4 was mated to that D20 previously. Notice the pin in the bearing retainer and the pin in the C4 adapter.

 

[widowmaker77]

That bearing retainer is really odd. Never seen one like that. It bolts to the tcase. You have something strange going on there. Input stub shaft looks odd too.

I’m trying to wrap
My head around how this thing bolts up to a transmission. Where tail shaft housing bolts to the case, there’s already a like a retainer plate bolted there. In the pic of the rear of the transmission you can see the flange with the bolt holes where it bolts to the case. So what am I overlooking here?

 

[Viperwolf1]

I’m trying to wrap
My head around how this thing bolts up to a transmission. Where tail shaft housing bolts to the case, there’s already a like a retainer plate bolted there. In the pic of the rear of the transmission you can see the flange with the bolt holes where it bolts to the case. So what am I overlooking here?

Yep. That about sums it up. Weirdness. Maybe someone was trying to make a divorced D20 or it's part of a cold duck setup.

 

[widowmaker77]

Yep. That about sums it up. Weirdness. Maybe someone was trying to make a divorced D20 or it's part of a cold duck setup.

That was kinda what my thought process was, some sorta divorced set up. At ay rate it’s weird looking.

 

[Oldtimer]

Post a picture of the adapter from both sides.