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K5 Blazer Limited-Slip Rear-End Noise when Decelerating

September 14, 2017 By Fred

Rear-end differential Chatter, Noise K5 Blazer
3D Printed Differential

Not long after I bought my K5 Blazer I started noticing a noise when I’d decelerate from highway speeds.  I don’t think the previous owner drove it at highway speeds, and I drive it on the interstate almost everyday.

It took several weeks for it to get bad enough for me to determine that it seemed to come from the rear-end (at least that’s where it seem to come from).  It was a chatter, almost like there was a very warped brake rotor.  It finally got so bad that it seems to rattle my teeth one day on the exit ramp and really concerned me.

I did a lot of searching and reading to no avail.  Then I finally found one post (I didn’t save it) that referenced a similar noise, vibration and limited-slip, positrac differential.  It said the first thing to try was changing the gear oil.  I was concerned that I had a serious issue and would have to spend big bucks to fix it.

This is the point I became a fan of Royal Purple.  I changed the gear oil and replace it with Royal Purple Max Gear Synthetic.  What a difference.  Never heard the noise or felt the vibration again!

It’s been a couple years now, and I think I should probably be proactive and change the gear oil in both differentials just for good measure.

Long run I want to replace the differentials with Eaton TrueTrac Torsen differentials but that will have to wait!

Fred

P.S. I now use Royal Purple Motor Oil and Oil Filters.

Filed Under: Differential

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