Toyota rear dshaft up front?

Depends on the angles. Regular ujoint driveshafts, the pinion and output have to be at the same angle kinda like this _ --. If the pinion is at 105*, the output needs to be at 75* (just random numbers). Double cardan joints (stock front IFS shaft), the pinion needs to be pointed at the output. If the pinion is at 75*, the driveshaft needs to be at 75* (These are the numbers on my rear driveshaft with a DC joint at the output). Get an angle finder from Lowes and remember that the angles you get will be relative to the ground that the vehicle is sitting on. The vehicle needs to have it's regular load (spare tire, parts, fluids) that you wheel with in order to get the right angles for smooth operation. Otherwise you will get vibrations. The further the angles are from each other, the worse the vibrations. That will kill pinion and output seals and, if bad enough, can break stuff.

I cant remember the max operating angles for the single ujoints, but they will go beyond that. It just wont be a smooth ride and the joint's life will be significantly shortened.
 
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