Sorry Rusty, I wasn't too clear. I don't have the MORE kit, I used a rough country. I made it sound like you could adjust the axle forward if you wanted, but it just stays in one position on the springs as normal. See if this makes more sense.
With the tires on and the jeep sitting level, the driveshaft is long enough, but if I jack the jeep up from the frame and let the springs droop, the driveshaft is about 1/2" too short as the axle is at the most forward position it will go (ie. shackles in rear have swung forward moving the axle forward). I've used jacks and my forklift to simulate different flex positions, but the axle really doesn't move any more forward than when the jeep is just jacked up from the frame.
I have to have a new driveshaft made and was just trying to make sure I'd tried different flex positions. If I needed a longer slip yoke, I was going to call a 4x4 shop, but if it just needs lengthened, I was going to get a buddy of mine who makes them for race cars do it. After using the forklift tonight, I'm pretty sure I don't need a longer slip yoke. I'm going to try flexing it one more time when it's light outside and not raining to make sure.
merr, what did you have done to your driveshaft before? Was it just lengthened. I'll measure the actual travel of the driveshaft tomorrow and maybe that can help you out a little.
84 CJ7, 258, shackle reversal, 4.56 gears, lockrite , moser one piece axles, 37" SSR's