Changed rear oil, still have a clunking

safaridude · Post by **safaridude** » Tue Aug 19, 2008 1:23 pm

I had my mechanic drain the rear end and put new oil in as recommended in the owners manual. He didn't see a major amount of metal flakes or shavings, but the clunking noise is still there when I make tight turns. Now what? Any suggestions? It is a G80 rear as shown on the rpo codes.

6spd_monte · Post by **6spd_monte** » Tue Aug 19, 2008 9:13 pm

G80 is the limited slip, right? Doesn't it need a special limited slip additive?

GEJ · Post by **GEJ** » Tue Aug 19, 2008 9:44 pm

Yes-I agree with James.I don't know what it is,but a GM part number.

1996astro · Post by **1996astro** » Wed Aug 20, 2008 3:27 am

According to GM specs the G80 only uses gear oil, no additive.

dunedog · Post by **dunedog** » Wed Aug 20, 2008 4:08 am

hhmmm,.....why did I put additive in mine then?

LiftedAWDAstro · Post by **LiftedAWDAstro** » Wed Aug 20, 2008 9:03 am

G80 does not require the additive according to GM. Just because there are minimal or no filings doesn't mean the G80 is still good. I would look towards something else being the cause...When was the last time you changed the transfer case fluid? It requires the GM Auto-trac-2 fluid. If it has been 30k or more it definitely needs to be changed. The t-case could be binding up causing the rear to do weird things.

safaridude · Post by **safaridude** » Wed Aug 20, 2008 12:38 pm

LiftedAWDAstro wrote:G80 does not require the additive according to GM. Just because there are minimal or no filings doesn't mean the G80 is still good. I would look towards something else being the cause...When was the last time you changed the transfer case fluid? It requires the GM Auto-trac-2 fluid. If it has been 30k or more it definitely needs to be changed. The t-case could be binding up causing the rear to do weird things.

I used the part number in the owners manual, it said do not use additive. Also, I bought the van used a few months ago so I don't know when the transfer case fluid was changed. The van has 70K on it now.

LiftedAWDAstro · Post by **LiftedAWDAstro** » Wed Aug 20, 2008 5:44 pm

Change the transfer case fluid and go from there.

Chevy & GMC Vans

Chevy & GMC Vans

Changed rear oil, still have a clunking

Changed rear oil, still have a clunking

Re: Changed rear oil, still have a clunking

Re: Changed rear oil, still have a clunking

Re: Changed rear oil, still have a clunking

Re: Changed rear oil, still have a clunking

Re: Changed rear oil, still have a clunking

Re: Changed rear oil, still have a clunking

Re: Changed rear oil, still have a clunking