here's the thing.
I currently have two complete 4wd ZF's and one 2wd ZF disassembled in a box. I don't have a "need" for two 4wd ZF's since I don't actively use my F450's anymore. I do have a need for a 2wd ZF for a backup just in case if I scatter the one on my '92 F350, but I already have one that needs to be put back together under watchful supervision. Got no idea what the 1st gear is, but they all have been in a diesel. I do have access to a S47, but if you are going to run that one in a IDI, you're going to need to change the input shaft since the PSD is a different animal.
Huh? I was of the understanding that the S47 would bolt right in with the right clutch kit?
I know the clutch & pressure plate on my Borg Warner is an 11" disk bolted to a SMF and I believe it has a 1-1/16" diameter input shaft.
I also know that the 5-speed I have
was bolted to a 7.3 with the 12" clutch disk & DMF and I'm 95% sure it has a 1-1/4" input shaft.
However, it is my understanding that the early 87 IDIs were available with a ZF-5 that had a 1-1/4" input shaft, that they had a conventional 11" clutch (with a spring-loaded hub) and pressure plate bolted to a SMF.
So are you saying that the clutch & pressure plate set for an early 87 IDI with the ZF-5
won't fit on the S47 input shaft and bolt up to my SMF? If that is the case, please clarify what part of it won't fit.
"how much is a little?" I got no clue. Dave85 will need to be asked if he is willing first and how much will motivate him to be willing. Am I willing to pay the freight? Not really, I already have a trans in either version. But I am willing to swap units. No, I am not willing to part out the trans either.
That's OK, I'm not interested in trying to persuade you to part one of your trannys. I don't think I would want to attempt the conversion even if I had the parts. I've done some tranny work before and IMO it is a pain-in-the-you-know-what and there is too much opportunity for even a small error or mis-adjustment/mis-alignment to cause MAJOR problems.
As for the gear ratios, the first and fifth gear ratios stamped on the tranny ID plate on the driver's side of the case on both the S47 4WD and S42 2WD trannys I have. Take a look at your 4WD trannys. They should have one of three things stamped on the plate.
5.72 - .76, or
5.08 -.77, or
4.14 - .77
As I understand it those are the three gear ratio sets offered in the ZF trannys. The 1st number is the first gear ratio, the second number is the 5th gear (OD) ratio (i.e. 5.08:1 first gear and .77:1 fifth gear). On both the S47 and the S42 4th gear is 1:1 and the second gear ratio is in the neighborhood of 2.7:1 and the third gear ratio is around 1.5:1 (give or take a little).
I take it that both of the 4WD trannys you have are S42s? If you'd be willing to take a look at the ID plates and let me know what gear ratio spreads are stamped on them that would help me figure out which one would be better for my application. I'm not really sure exactly what I'll end up doing, but I really appreciate your offer and your advice. I'll get back to you as I get farther along in figuring out what I want to do.