Join Date: Nov 2002
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Re: CV shaft or offset rear diff?
It's amazing how many are doing the toy axle swap, seems commonplace now.
Anyway when I did my rear axle, I pointed the diff up towards the t-case and used a stock front CV driveshaft from the a 83 toy truck. Actually, on advice of this board, I kept it about 5 degrees down when the truck was unloaded. When it was loaded as if for trail use, the springs dropped down enough that the pinion angle became about 2 degree down. In the stock rear location I think you pretty much have to use a CV driveshaft since the angles are steep. Maybe if you did a SPUA and kept the lift low you would be ok with a non-CV.
With this setup it drives pretty good. There is almost no vibration. I could barely detect a vibration over the worn mud tires on it. This was with a stock 83 toy axle in close to the stock rear location. It would be good enough for me for a daily driver (mine is trail only), but I don't know how much the u-joint life would be reduced.
A friend did the same kind of swap except he moved his axle back about 6 inches (relocated the gas tank). He got away with using a regular u-joint drveshaft. The pinion angle matched the t-case output angle. Drives fine, no significant vibration.
Don't have much to lose by trying it. If you don't like it, you can always yank the axle and send it to Sky for shortening.