Ok I know there is some clearance issues with the Auto Tranny and the Front Driveshaft on CJ7s.. I have 78 CJ7 w/4in Suspension lift w/ 304 and Th400 automatic mated to Dana 20 adaptor and the Dana 20.. I need a new front driveshaft and got a measurement of 38inches from Yoke to Yoke.. Does this seem correct? Also will the 2in Driveshaft be the Correct Size or Do I need to go with a 1in design?
with a 4" lift, shackle reversal and the front axle moved forward an inch, mine comes out to 40". i think there is room for a larger than original diameter shaft. mine had some weights tacked to it by the transmission that stood up about a 1/2". definately not room for anything bigger than 2" though.
If you plan on using the same yokes and slip shaft you will have to stick with the 1" tube. They do have a heavy duty tube that you should ask for I think the wall thickness is .188 instead of the .12. I had both the front and rear drive shafts redone with the biggest tube avaliable without having to buy new yokes after snapping the front and putting a 1/4 twist in the rear one. At least if all happened on the same weekend. Just replacing the tube only costed about $70 each.
Sound like you have almost the same setup that I have.. I run Dana 30 front Dana44 rearend Auto tranny... I got a guy that has a driveshaft with the correct length but its 2inchs in diameter. some people say this will fit but others say no.. Please tell me before I buy it..