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I just did a chevy swap on my 85 runner and the drive shaft is humming pretty badly. I did not use lift blocks and I went with the double shackle set-up. The lift blocks that I originally were going to install are tapered (as are most blocks) and I was wondering if this taper is enough to compensate for the angle. I want to know what those of you did to fix this problem if you used a shim, what degree? If I made the front driveshaft longer would the double cv compensate for the angle?

Sorry there are so many questions. I did the search and could not definet answers. Thanx in advance for any input I recieve. <IMG SRC="smilies/smile.gif" border="0">
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You could try a 3 or 6 degree shim and see where that gets you. That'd be the easiest and cheapest way.
I ended up using 4" blocks with a 3 degree taper from a Chevy for mine. That was to match the 5.5" lift from the 44044 Rancho's. Chevy's gave me about 2" of lift, but with the weight in the ass end of my 85 Runner, I still used the 4" blocks.
My driveshaft was shortened and beefed of .156 wall for the dual cases. I used my front driveshaft's CV joint for the rear driveshaft and went square tube on the front driveshaft. Haven't had any problems yet and it's been abused badly. The square tube vibrates at 35 mph and above, so if you need more than a rockcrawling solution, it's probably not what you're looking for.
 
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