I have a ZF5 from behind a 7.3 IDI. I would like to switch from my current transfer case to one with a flange output to the rear shaft. I want it to bolt up to my ZF and hold up to the torque produced by a stock 12-valve 6BT (400 ft lb).

What trucks should I be looking for at the junk yard? I kind-of remember something about Broncos.

Roy

 

I believe the BW4407 used in 96/97 f250s and 350s had a flange output

 

Thanks. Anyone know about the input for the 4407...same spline, same bolt parrtern, as my 1356?

Roy

 

Input spline count and bolt pattern is the same.

 

Broncos came with fixed output bw1356, and a bw1345 is pretty much the same as a 1356 if you find one of those first. The 4407 is most desirable in the form of fixed output and strength, and equally harder to obtain.

 

Thanks, all.

Anyone know what trucks the 1345 came in?

Roy

 

80-88 Trucks

 

Thanks. This is what I got:

1356 from Bronco
1345 from 80-88 trucks
4407 from 96/96 NBS lite f250

 

No, the 4407 is in 96/97 OBS F250/350.

 

Thanks Lead,

1356 from Bronco
1345 from 80-88 trucks
4407 from 96/97 OBS F250/350

 

A NVG271 from behind a 4R100 will bolt up and has flanges on both ends. There were many more of them made than the 4407 and finding a manual version isn't too hard since a low trim work truck usually got the 4R100 and a manual case. The biggest problem with them is that lots of them were behind diesels so the guys selling them tend to be the mouth breathers who list a headlight for $500 because it's a "diesel headlight" and "manual cases don't break. The 271 was also the best case Dodge offered at the time so the "Cummings" fanboys jack up the price by association. If you're patient then you can find a 271. I think it's the better choice just because you know that there's many more out there in case (see what I did there) you need to find parts a few years from now. The 271 is also a little bigger (bigger sprockets and therefore chain case) than the 4407 but the 4407 has a much wider chain so you may need to hammer the floor to make it fit. IIRC they're the same length so the drive shafts will be the same.

Either is a huge step up from a 1345 or 1356, just put them side by side and you'll see what I mean.

The 1345 didn't have flanges, it had fixed yokes. Some people say it uses the same splines as the 1356 and yokes interchange, but the one I took apart didn't. Considering the number of 1356s I've seen for sale as 1345s and vise-versa I'm skeptical that yokes/flanges can interchange. If you're gonna use the stock yokes then the 1345 is the way to go because the pump is bolted to the planetary case and if it spins you have bigger problems.

 

Great.

So, the 271 is in SD trucks with an AT and manual transfer case, 1998 to 2004, right?

Yoke or flange is OK. I just want to avoid the slip-spline output of my current 1356.

Roy

 

The first and last 4R100s (E4OD) to roll of the line were 31spline output. If the case bolted to that it will bolt into your truck. There's several other output splines in SD trucks that use the same 6-bolt pattern so you must get one from an 4R100 to be sure. IIRC some of the earlier 5spd autos used the 31spl but you'll need to count teeth before you buy.

 

BW1356 from Bronco
BW1345 from 80-88 trucks
BW4407 from 96/97 OBS F250/350
NVG271 with 31 spline input. From SD with 4R100 AT tranny and manual t-case (98 to 04 with a gap in the years)

Thanks ****.

Feels like I've got a pretty good list to hit the junk yards with.

Roy

 

Some (maybe all, I haven't looked at many) of the newer 1/2-ton cases are the same 31spl. I'm sure there's more that could be added to the list.