I'm in the process of transplanting a 67ish V6 drivetrain into a M38A1 frame. The original frame of the Jeep was rotted beyond saving and I happened across a very clean A1 frame locally. I cut out the original motor mounts and welded in the V6 mounts. The old frame was a factory V6 model. I've checked several different ways and I'm confident the location of the mounts in the new frame match where they came out of the old one. I went with M38A1 style spring shackles since that seemed more straightforward than attempting to change spring hangers. The springs are the ones from the V6 frame. Yesterday I dropped the engine and transmission into the frame. Things seemed to line up well. However, I ran into an issue with the front driveshaft. It's nearly maxed out in length. If I raise the jeep up by lifting on the frame (full suspension travel), the driveshaft is maxed out in length and has no end play. Naturally compressing the springs is not an issue. Conversely the rear driveshaft is close to fully compressed when installed. I do need to check and see how much room that has before it's fully compressed. As the jeep sits the length of the front driveshaft is 23-3/4" and the rear is 18-3/4" between u joint centers. Here is a marginal quality photo showing what's in working with. Is this at all normal? Do I have a parts compatability issue? I should have taken a closer look at how this lined up before removing from the old frame.