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| 1990 ZR-1 | · 07-24-2011

Quick update. I had a chance to pick up the car from the mechanic this week, and jack it up and inspect it myself. I did not see any bent parts, and I also do not see anything visibly wrong with the diff. The mechanic claimed that the half shaft where it connects to the the diff was loose, but I pulled on it in every which direction by hand and also with a crowbar and it didn't budge. I did notice, however, that the yoke is presssed into the diff about an 1/8 of an inchwhen compared to the passanger side and caused the big spacer with rounded edges rub against the diff housing. I also noticed a little bit of diff fluid on that side, but not enough where it dripped on the floor. I started to inspect the trailing rod bushigs, and noticed that the all have small cracks on them and one on the lower rod connecting to the spidle had a huge crack in it. I removed the lower dog bone and noticecd that the bushing is not centered and looks severily deformed. I ordered a new set of 8 bushings and will repalce them on both sides. I just hope this has not caused any issues with the seal in the diff since the half shaft is pushing into the diff.

I really think that my issue lies in those 21 year old, blown trailing rod bushings. I belive when i had the additional 400lbs loaded in the trunk that day, the extra weight did it. If this is the case, I'm going to take those old busings to my mechanic and will put him to shame, since he's suppose to be the pro, but I, a none mechanic just a handy person, used my brian and figured this out within the 15 minutes I had the wheel off.

I'll keep you guys posted once the poly bushings are installed.

07-24-2011	#7
\| 1990 ZR-1 \| Join Date: Feb 2011 Location: Medford, NJ Posts: 75	Re: Differential issue... Quick update. I had a chance to pick up the car from the mechanic this week, and jack it up and inspect it myself. I did not see any bent parts, and I also do not see anything visibly wrong with the diff. The mechanic claimed that the half shaft where it connects to the the diff was loose, but I pulled on it in every which direction by hand and also with a crowbar and it didn't budge. I did notice, however, that the yoke is presssed into the diff about an 1/8 of an inchwhen compared to the passanger side and caused the big spacer with rounded edges rub against the diff housing. I also noticed a little bit of diff fluid on that side, but not enough where it dripped on the floor. I started to inspect the trailing rod bushigs, and noticed that the all have small cracks on them and one on the lower rod connecting to the spidle had a huge crack in it. I removed the lower dog bone and noticecd that the bushing is not centered and looks severily deformed. I ordered a new set of 8 bushings and will repalce them on both sides. I just hope this has not caused any issues with the seal in the diff since the half shaft is pushing into the diff. I really think that my issue lies in those 21 year old, blown trailing rod bushings. I belive when i had the additional 400lbs loaded in the trunk that day, the extra weight did it. If this is the case, I'm going to take those old busings to my mechanic and will put him to shame, since he's suppose to be the pro, but I, a none mechanic just a handy person, used my brian and figured this out within the 15 minutes I had the wheel off. I'll keep you guys posted once the poly bushings are installed.