another driveshaft question

I just completed a spring over project on my 80cj. I knew there would be a driveshaft angle problem but I'm not sure if I should go ahead an buy a cv type shaft. With the dana 300, I have a 22 degree angle on the rear shaft. I'm not concerned with binding as much as possilbe vibration at highway speeds. Does anyone know the accepted max angle or is it just trial and error.
thankshttp://www.earlycj5.com/forums/images/smilies/icon_smile.gif
http://www.earlycj5.com/forums/images/smilies/icon_smile.gif

 

In the perfect world, the angle of the pinion and the angle of the Tcase output shaft are the same. I sprung for a CV and finally got rid of the vibrations.

 

I used a trial and error/educated approach. After some measuring I concluded that I needed anywhere between 6-8* shims. I started with the 6* shims first then took it for a drive and returned the 8* shims cause it fixed the problem. BTW, you should be equally concerned over dshaft binding - it only has to bind and break once to demonstrate how concerned you should be.

Karl

 

When I installed 4.5 inch Rubicon Express springs I had vibration at only 20 mph,,, and that was with the kit supplied 7 degree wedges and t/c lowering kit (which is worthless) .If you go over 8 degrees or so you can kiss your diff & gears good-bye, as there will be no lube to keep them alive. You definately want to get a cv shaft,,,, small cash outlay that will save lots of headaches in the future. I'm glad I did.

 

About how much is the cv shaft and what is it exactly?

 

A CV joint allow for more flex (steeper angles) while the shaft is rotating. It is basically 2 u-joints in a special coupler that makes them one unit. You will also have to add a compatable yolk to the TC output.
You can get a new one from Woods (www.4xshaft.com)or other maker, if there is a good driveline shop in your location they can add the cv to the shaft you have now.(This is what I did.Mine ran under 250$ , including the new yolk)

Sorry I dont have pics to show you,,, I'm technologically challenged. Computers kick my butt on a regular basis.

 

I seem to remember reading on Tom Woods site, I believe, that a 14 or 15 degree included angle at the u joint is about max.