Originally Posted by tuc
Great artical. At first I though this was about cv axle shafts like the RVC Performance which are the same as the longfield shafts, now if you have any insight on those that would be great. but still good read
so as I described in post #1, CV's are Constant Velocity joints. A true
CV axle would be an axle shaft with a CV joint in it.
Like this front wheel drive application:
Remember they work like this:
Notice there is a boot covering the mechanism. Remember, CV axles are stronger for their given size than a U-joint system, which is why they are used so frequently where space is premium - like Front Wheel Drive sedans and Independent Suspension systems.
Strength is always about two things - material choice and how much force you put across how much area of that material. CV's are stronger by design - they have more degrees of movement and more surface area to spread torque across. U-joints have two points of contact - each roational axis of the 4-pointed U-joint. Constant Velocity joints have the little ball bearings inside that spread the same force across a much greater area - think of it almost like a multiple-pointed U-joint.
The major downside to CV axles in a TJ is they will most likely require some grinding or knuckle modifications and they are EXPENSIVE.
But since we're talking about drive shafts here, read this thread and start another if you feel the need -