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UTV's Off Road ( RZR, YXZ, Mini Buggy, Carts,etc.) => UTV Motor and Drivetrain => Topic started by: The Kar Audio Guy on December 23, 2009, 11:54:52 AM
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I would love to get some opinions on CV's vs U-joints, but please support the opinions with at least a little fact.
I have a friend with an LS1 powered rail and he swears by U-joint...???
let the games begin!!
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Oh, GOOD GAWD!. Not again. ;D eyes 8)
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I did a search but could not find what I needed. sorry to beat a dead horse, just trying to get some clear Ideas from many people instead of just a few.
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truth is that you will find lovers and haters on each side.
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I realized that, this is way I asked people to state some FACTS to support their opinion.
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The fact is that both work well within their capacity. Personally I believe in cv's but the next guy loves uj's. Both work equally well at reasonable angles but when geting into the big angles is where the opinions start to take on real emotion and not logic IMO.
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Seems to me you require alot more plunge than a CV can provide. I was speaking with DS lastnight and he mentioned that there are slip shafts out there that offer up to 7" of plunge.
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The worse thing about U-joints is they really alternate the speed of the centershaft at high angles.
Sort of off topic but also on it. I do wonder that I used to see some Ford Ranger driveshafts that instead of U-joints in the rear driveshaft and I think they had a slip joint too built into the drieshaft off the front CV. I need to go junk yard hopping (but not so much in this cold.....)
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The drive shaft on the Skyline's are CV joint driven. I just modified one for a guy pumping 600 HP in a custom built turbo charged car, Very cool indeed. The CV joint was the size of a 930 but thinner. Not much angle seen by these either.
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I per fer my u-joints but if you can get the same angle out of cv's for less money than I would go that route. the deciding factor does still come down to preference and use and local parts availability! I will say that I don't believe u-joints are preferable on trailing arm rails because of the amount of plunge required! just my opinion, a rear end that uses very little plunge is the best way to go but not always possible for some. I do believe in the teflon coated splines on the slip shafts though! there are always those that neglect to grease those shafts and when the grease leaves the spline well lets just say there are a lot of bad opinions out there because of this one! I have only seen one pic of the spline tq locking and yanking the drive flange off the side of the transaxle and braking the case. no I can't find the pic anymore I should have saved it when I had the chance. there are several length of slip shafts available for the amount of plunge needed. I believe 3" 6" and 2 more longer ones.
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Trouble with that much plunge whether its cv or slip joint is friction-heat-trouble. These things need designed with the minimum plunge that can be accomplished while maintaining decent suspension goemetry-cv or uj.