Personally, i find the auto rules off road, sure it sucks on the highway or long trips and stuff, but for wheelin you just cant' beat it.

I may be Major Dummy but isnt a drive shaft change out about the easiest part of the whole deal?

Probably so, once you get those flange bolts off and assuming the # of splines is the same.  It just may be something else to add to the list.

When I got my 3speed trany fixed-up, the guy said that the 3speed tranys are alot more differant than the 4speeds. He told me that i ever wanted to put a 4speed in, that I would have to get my hands on the electial equipment, and a smaller drive shaft, probably some other stuff to go along with it too. Then he asked me why i would ever want a 4speed, cuz the 3speeds are almost bullet proof. Except for some seals. He said that there are bushings insted of bearings inside the 3speed, and that they never wear out.

I really do like the 4spd auto but I think the overdrive gear is way to low.  At 45mph it kicks in at 2900rpm and drops the rpms to 2500.  Not much of an improvement.  At 70 the car is pushing over 3700rpm in overdrive and should be about 2500 to really give good results.  I guess thats why I only get about 22 miles per gallon.   And it doesnt matter when in 4wd off road at slow speeds so it seems like kind of a waste.  I wonder if a different gear can be dropped in for the overdrive?

run 35's.  At 60 I'm turning 3000 rpms... in third
Brian

run 35's.  At 60 I'm turning 3000 rpms... in third
Brian

And what has happened to your mileage?  It seems to me that lower RPMs would mean better MPG, but that rarely seems to be anyone's experience.

Someone asked why you'd want a 4th gear, well, I would like one for the mileage and, probably, a lower 1st gear.