hey so i have got myself an 89 bronco 302 aod . the problem i have is my transfercase is dun shes pritty loud but it has 400 000 kms on it . anyways i got another t case from a buddy but its a slip yoke style 1356 the one im my bronco is a solid yoke 1356 . so is it a big job to swap the tailstock and put on my solid yoke or do i have to replace my whole output shaft? im kinda new to the broncos so i dont know a whole lot bout them. thnxs for any help.

 

If you are swapping from a 1356 with a flange-type output to a yoke-type you will need to swap the output shaft from your older t-case to make the swap work. The spline diameter on the flange-style output shaft is .020" BIGGER than the yoke-style output shaft. Spline count is identical but the shaft is too big. (Don't we all wish we had that problem). But don't take my word for it, ask Grogtronics. He ended up selling me a newer t-case that he had gotten for just that purpose and found out the hard way. Not sure why he didn't swap the output shaft from his old t-case but I'm sure he had good reason.

 

awsome well i have a chance to get a bw 1345 case from a f150 with the proper yoke but its hooked to a five speed mazda. will that t case bolt up to an aod or am i gona run into different shaft problems again .? thnxs

 

Shouldn't be a problem on the input side that I can think of. Too bad you are as far away as you are. My brother is looking for a 5-speed to put behind his 300 in his '77... yes an early Bronco with a 300. Damned little thing will crawl over just about anything.

 

oh man those years are in my opinion the best looking broncos . so anyways i bought a transfercase from a wreckers its supposed top be what i need so well see. thnxs for the help bud.

 

I swaped a transfercase in mine and put the flange yoke on the older style. It has been doing fine so far. (about 2000 miles) But I did knotise it didnt fit quite right. I rebuilt my old one, so it will go back in when I get the time. Does anyone know why they changed to a slightly larger shaft. Just to be a PITA. Greytstreak, Do you know for sure that the large shaft will fit in the old case?

 

To the best of my knowledge, as long as you purchase the corresponding bearings etc. to go with the larger shaft, the swap should be seamless. The output shaft changed size but the casing castings did not, meaning the bearing inside diameters changed but not the outside diameters. I thought Grogtronics told me he ended up eventually swapping to the flange style rear driveshaft hence the larger output shaft. You might drop him a line and see if he can shed any further light on this topic.

As an afterthought... the shaft diameter may only be different at the splines and identical otherwise. I only have this info from Grog after much cursing and bleeding knuckles on his part.

 

I would think that it's just the splines. The reason I ask. My origenal case (which I just put back in) is worn at the shifter arm. The hole that the shifter arm pivots in is just that, a hole. No bushing, bearing or anything except a seal. It wouldnt matter much, but if it gets any more sloppy, it could allow the shift fork to jump out of it's guide. That would be very bad. I would drill it out and put a bushing in, but that hole is lengthwise on the case, if you know what I mean. So it wont fit on my mill. I'd rather not drill it by hand.

The case I bought at the junkyard is tight at the arm, but of course it has the small shaft. As you said, it is small differnce. The flange goes on just a little loose. But the old yoke will not go on the big shaft!

When I put the rebuilt case on today, I knotised it ran smoother. It may have been because the flange is running true. It also could be because I changed the transmission mount. The rubber on mine was soft like jelly. I guess oil got to it.