Topic: Double CV???

[guywithuglyyota]

I was just curious if it is possible to have a double cardon joint made up using a joint at both ends? 

Sounds overkill but it was just a thought, seems like it would eliminate any vibes at all, reguardless of pinion angle.

I thing this is done with short short wheelbase rigs like Jeeps etc...

Seems like it would prolong the life of the joints since your cutting the operating angles twice, instead of once, and the cv seems much stronger than a single u-joint at the pinion end of the shaft.

[WHITE_TRASH]

There is a reason that cv's have larger u-joints than than the opposing end of the shaft.  They are inherantly weaker.   They do make double cv shafts for sizable angles but their usage is limited by the yokes on the axles.  Most axle would require a custom yoke whereas yota's you just drill another pattern.

[guywithuglyyota [OP]]

So overall it would work, but is not necessary? I didnt know they had larger u-joints, I need to learn how to rebuild one myself already!

[WHITE_TRASH]

Nope ya don't need it on both ends.  Well not on a yota anyway.   Due to my transfercase beings basically inside my cab, even with my wheelbase I have a total crap angle at the rear output.  I had the shaft built with the 94 CV and .188" DOM tube.  I need to turn the pinion up about 1* to be right but its fine for now.  I just get a bit of vibration on deceleration.

[guywithuglyyota [OP]]

Sounds good, yeah my angles will be just fIne after I rotate the rear axle up a bit. I figure if I point the rear pinion @ the t case output, run my 94 cv and be happy   

.188 that sounds like beef! Was it hard to balance???  I wonder if the shop I deal with can do that, I think that would be good peace of mind on the trail.

This is my daily driver so I dont wanna get too crazy

[WHITE_TRASH]

I didnt bother having the shaft balanced.  I drive my junk to all the trails and it doesnt vibrate enough to even worry about.  The best way Ive found to get a good rear pinion angle with a cv is to put a straight edge on the rear flange and have the flange pointed directly at the bottom of the t-case flange.  Give you a good angle to start with.  The rule of thumb is when using a cv you want the rear flange at 2* lower than if it was pointed directly at the t-case flange.  If its pointed at it directly at rest when you get a little bit of spring load (from driving down the road) you will get vibrations because the rear flange is pointing up a bit which tossed the angles off.