NCLA951

I've been hearing a low whomp whomp whomp from my right rear area for a while now, been dealing with other things first. Now that engine is back to a happy place I'm addressing the other little (hopefully) things.

The sound can be heard on this video, I hadn't noticed it since I always drive with the windows down.

https://youtu.be/WWF-HE-uQiw

I thought it was CVs since the wheel bearings seemed solid and the wheels have no play or grinding when turning. Cleaned and re packed them, they looked perfect, and swapped axles side to side, same sound from same side. Thought I'd go ahead and do wheel bearings, but wondering if I should bump up my spare trans rebuild schedule because it doesn't seem like wheel bearing.

The sound is speed and not RPM dependent, at idle with the trans in neutral coasting you can hear it slow in sync with wheel speed.

Anyone have a trans go after hearing this sound?

968workaholic

Does the sound change with load, like hard left/right turns?

NCLA951

I'll check today, I haven't noticed that it does.

It's when coasting to a stop that I hear it the most, but that's also because everything else is fairly quiet.

Raceboy

When under load the shaft of the diff satellite gears is pushed against the diff casing so it probably won't make much noise but when at light load it may move more freely.

I would go for the diff satellite shaft (more specifically the pin that holds it in the casing) and the shaft is touching pinion.

V2Rocket

find someone with a tow vehicle, disconnect your axle shafts from the hubs, get in 951 and have it towed around...do you still hear it?

NCLA951

That's a very involved test!

Dougs951S

its actually just redneck enough that it might just work..

951Dreams

Redneck test are always the best! And even if they don't work, sure are fun!

V2Rocket

Rednecks doing science!
There are two suspect parts that could be making the noise - R/P, or the wheel bearing...

So isolate them to narrow it down

My guess is wheel bearing.