1982 Chevy Blazer Four wheel drive/vibrations

Tiny
PDITTY112
  • MEMBER
  • 1982 CHEVROLET BLAZER
Drive Train Axles Bearings problem
1982 Chevy Blazer V8 Four Wheel Drive Automatic

My blazer has has a 6" or so lift with 33" tires.

I've been having some vibration issues with the front end of my blazer. It is a slow speed vibration meaning that its only apparent when I'm driving less than 30 Mph. I thought it might be the front driveshaft. The front driveshaft was wore out so I recently replaced it with a brand new one. I also disconnected the rear driveshaft to see if maybe that was the cause of the vibration. Even with the rear removed and the new front driveshaft there is still a significant vibration. I rechecked the bolts on front shaft and it is still snug.

Also when I drive with the front wheels engaged there is a clicking sound that seems to be coming from the transfer case. The clicking speeds up and slows down as the vehicle does. I checked the fluid level and it is ok.



Please help I really don't want to rebuild a front axle or transfer case if it can be prevented. Thank you.
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Monday, November 10th, 2008 AT 11:49 AM

3 Replies

Tiny
JAMES W.
  • MEMBER
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.
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Monday, November 10th, 2008 AT 3:42 PM
Tiny
PDITTY112
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Its not in the steering wheel. If I had to pick one of those I guess I would say the seat. I have noticed that its the worst when the vehicle is in drive and if I put it in neutral it seems to go away or less noticble atleast.
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Monday, November 10th, 2008 AT 8:19 PM
Tiny
JAMES W.
  • MEMBER
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.
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Tuesday, November 11th, 2008 AT 1:43 PM

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