Thumping from the rear end on a right turn.

[B-Fox]

Completed a 230 mi trip last night got to my street where I live turned right and it felt and sounded like I had a flat tire got out and checked all the tires were good continued to pull into my driveway and when turning right I felt it again it came from the rear I've checked brakes and drums all that seems normal. It's definitely coming from the rear I have pulled the differential cover off and I'm going to change the fluids today.I'm thinking something to do with the g80 locker Any helpful tips? (3.42 rear g80)

Should the fluid have a lot of air in it?

 

[1BADI5]

No the gear oil should not have bubble in it.

Have you done any offroading? Looks like someone put the wrong fluid in there

 

[exp500]

Wash out that pumpkin best you can, Don't know by look what that is, looks like Diesel fuel mix. Check outer wheel bearings too.

 

[B-Fox]

No the gear oil should not have bubble in it.

Have you done any offroading? Looks like someone put the wrong fluid in there

I haven't done any off-roading and this apparently seems to be the first time this cover has been removed. Only has 94,000 original miles. The gentleman at the auto store told me he suspects the air vent at the top needs inspected it may have got moisture in too the rear end.

 

[1BADI5]

Wash out that pumpkin best you can, Don't know by look what that is, looks like Diesel fuel mix. Check outer wheel bearings too.

Agreed on checking those bearings and seals

 

[B-Fox]

Agreed on checking those bearings and seals

Bearings and seals seem to be okay no unnecessary movement on the wheels pushing pulling or tugging. After I checked the brakes I put the drums back on and took it for a drive no issue, which has me puzzled. I'm putting new differential fluid in now new gasket and replacing the cover after I clean everything out with break cleaner.

 

[1BADI5]

Sweet, hopefully its an easy in and out job for you!

 

[exp500]

If it was mine, I'd change it again 50-100 miles. Did you check vent line clear?

 

[B-Fox]

Job complete
everything is back together, no leaks. I did my circle 8's in a parking lot and then ride through town. So far no noises or symptoms of anything wrong.

Also changed engine oil and spark plugs while I was at it. I think plugs were original (94,000mile) Advance auto said they don't sell the these numbers anymore. AC 41-932

 

[B-Fox]

All seems to be well. I've drove 300mi since rear diff change. No leaks, noises or grinding.

 

[OR VietVet]

All seems to be well. I've drove 300mi since rear diff change. No leaks, noises or grinding.

That discolored fluid had water/moisture in it. It may be good now and hopefully you are ok but I would replace that vent valve and keep an eye on it and check condition/color every 500 miles at least, if not sooner.

 

[exp500]

As much water as was in it, likely it went swimming hot!

 

[Fless]

I'd be inclined to change the fluid once again within a few hundred miles. Just to be sure. Cheap insurance.

 

[exp500]

No one mentioned front diff or tcase check either......

 

[OR VietVet]

@exp500, what he said.

 

[B-Fox]

No one mentioned front diff or tcase check either......

I actually thought about checking this just the other day. My next priority.