So I recently acquired this Blazer and I have been slowly nursing back to health. Without going into a long and boring back story, I have a vibration in the back end that I need help with. The vibration gets worse with speed and under load. At freeway speeds and when I lift off the throttle the vibration reduces considerably.
First, I determined the rear driveshaft had some issues. The joints at the yoke had excessive play as well as one of the weights was missing. I replaced the entire driveshaft assembly and test drove. This helped but the vibration is still there.
Secondly, I took the rear diff cover off to see if I could find any clues. I noticed that the oil was clean but it had a lot of tiny air bubbles. Also, the magnet was clean and had no evidence of metal shavings. I checked the vent tube and it was clean. So to try to figure out where the air bubble were coming from I checked the axle seals and bingo!
Question: Could this vibration come from one or both of the axles and the bearings? Since I have to replace the seals I mine as well replace the axle shafts and bearings. I can not think of anything else it could be. What do you guys think?
First, I determined the rear driveshaft had some issues. The joints at the yoke had excessive play as well as one of the weights was missing. I replaced the entire driveshaft assembly and test drove. This helped but the vibration is still there.
Secondly, I took the rear diff cover off to see if I could find any clues. I noticed that the oil was clean but it had a lot of tiny air bubbles. Also, the magnet was clean and had no evidence of metal shavings. I checked the vent tube and it was clean. So to try to figure out where the air bubble were coming from I checked the axle seals and bingo!
Question: Could this vibration come from one or both of the axles and the bearings? Since I have to replace the seals I mine as well replace the axle shafts and bearings. I can not think of anything else it could be. What do you guys think?