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I went back and looked. It is. True! Yep, that's it. I was thinking it was an A1 vs A2 thing.

Oh, and I noticed the older and newer trucks do have different transfer case mounting brackets... I'll take pictures later.

This should have occurred to me sooner... The '87 I measured was in a wreck and the frame is bent. I was thinking if the drivetrain shifted, it would have all shifted together, but that may not be the case. That would account for the 1" difference. We just need someone else with an '87-89 deuce...

Okay... I went back and figured out where the difference is... The '66 and '87 do use a different jackshaft, but they appear to be interchangeable. The difference is in the flanges on each end. On the '66 it's 12" flange to flange, and flange to U-joint center is 2.5". On the '87 it's 13"...

@gringeltaube @gentrysgarage I measured my '66 A2 and the U-joint center-to-center is 7", which agrees with Gringeltaube's number. But I measured an '87 Air Force A2 and the U-joint center-to-center is 9 3/4". It also looks like it uses different U-joints... I thought all A2's would be the...