1982 Chevy Blazer Four wheel drive/vibrations

Problems with a transfer case may make noise but, not cause a vibration as long as everything is tight. Where do you feel the vibration most? Steering wheel, seat, floor? If in the steering wheel, is it a bounce or a shimmy, back and forth? Please advise.

If you still have the OEM drive shafts in the vehicle, your problem is definately a u-joint. These shafts use a "constant velocity" or CV joint in place of the standard u-joint. The CV joint is stronger, but doesn't have as much flex range as a standard joint. With your 6" plus lift kit, you be outside of the allowed flex range for a CV which will create binding of the joint. This will cause the vibration you describe. Also, you can try to "shake" a bad CV and unless it completely junk, it won't move. You mentioned you replaced the front shaft with a new one. Was it a brand new one or a rebuilt? I have had many rblt. CV joint shafts that were grossly out of balance. One one vehicle I went through 3 of them before I found one that didn't vibrate. That was on a lincolm continental with dual CVs. How you can check your CV joint range is disconnect the shaft from the differential and let it hang. Turn the shaft back by the transfer case and watch the relationship or allignment with the differential yoke. If at any time while turning the shaft the differential u-joint comes up to mounting position or above, you have found your problem. The CV is out of range. Repair option; have a shaft made with 2 standard u-joints instead of the CV. Hope this helps and thank you for your donation. It is shared between all of the moderators.