Posted by casebro on Wednesday, October 24, 2001 at 10:52PM :
In Reply to: Re: Drive shaft Question posted by Tom J. on Wednesday, October 24, 2001 at 6:00PM :
You want to assemble it as if it was a 1 piece shaft ( w/ out slip joint). The 2 axis on the center section would be parrallel. Look under a car that has a 1 piece shaft to see- most newer vehicles "slip" into the transmission and can't be disassembled. You want your drive shaft to be 1 big 'c.v.' joint (that double u-joint thing on rear drive caddilacs) If mis-aligned it WILL vibrate, assembling 90 degrees out will vibrate the worst, it'll be a 'non constant velocity' joint.
"Constant Velocity" means that input and out put turn at the same speed. A "single cardan" (1 u-joint) will vary speeds by up to 20% in various parts of it's rotation. In a 'double cardan' system, the center section will vary in speed but due to having 2 u-joints that oppose each other (If angles are equal) the transmission will turn at the same speed as the differential. What this means is that the more severe the angles of your drivetrain, the more your driveshaft speeds up and slows down with 4 times with each rotation. This is one reason the driveshaft is built so light. This is also why the best front wheel drive systems use the Rzeppa (pronounced "Cippa") joint, or the "Bendix /Weiss" joint, to prevent the 'wheel hop' of the 1970's full time 4x4 systems.
Sorry if I rambled on, this is important to know if you're gonna understand your 4x4 system. I'm sure somebody out there will clarify me, if my redudancies don't make it clear.
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