Rear end rattle diagnosing?

[Schurkey]

As The Floyd sang: "Got to keep the loonies on the path"

 

[tsr2185]

Got diff cover off and it was pretty dirty and lots of metal sludge on magnet. No metal flakes or chunks. No side to side play in pinion. Diff was still full of fluid. Starting to think the dirvers side leak is the caliper. Rotating driveshaft in neutral with tires on the ground there is about 1/8 rotation of slack from driveshaft from diff. Posted videos on fb and 90% people said that was normal.

Closed the tailgate and one of the exhaust tips rattled ‍. Wd40 that exhaust hanger, filled up diff with fresh fluid and couldn't replicate noise on hwy. Hoping I was just overthinking it first time around when I was under there inspecting it.

Thanks for all the input, but it turns out I just look for things like my 7 yea old even though everyone tells me where to look!!

 

[Pinger]

Closed the tailgate and one of the exhaust tips rattled ‍. Wd40 that exhaust hanger, filled up diff with fresh fluid and couldn't replicate noise on hwy. Hoping I was just overthinking it first time around when I was under there inspecting it.

Thanks for all the input, but it turns out I just look for things like my 7 yea old even though everyone tells me where to look!!

My smart had a bad rattle when idling. Engine mounts were the first thought. Nope, a folding warning triangle in a plastic box behind the passenger seat joining in with the typical three cylinder idle vibes.

 

[Erik the Awful]

Rotating driveshaft in neutral with tires on the ground there is about 1/8 rotation of slack from driveshaft from diff.

1/8 rotation, or 1/8" rotation? I'm pretty sure you mean the latter, which is normal, but it took me a minute.

 

[someotherguy]

My smart had a bad rattle when idling. Engine mounts were the first thought. Nope, a folding warning triangle in a plastic box behind the passenger seat joining in with the typical three cylinder idle vibes.

My previous 300 SRT8 had a weird intermittent clinking noise when I'd drive aggressively. Mash the pedal, brake, turn too sharp..

It had been that way since I bought it. Started to drive me nuts...

While doing a major detailing of the car a few months later, I discovered a few misc. pieces of a new bathroom sink faucet kit under the driver's seat.

Richard

 

[tsr2185]

1/8 rotation, or 1/8" rotation? I'm pretty sure you mean the latter, which is normal, but it took me a minute.

I can't load videos on here but with xfer case in neutral and I grabbed the drive shaft by diff and was able to rock it back and forth with the slack. I'd say more like 1/4" rotationally free play.

 

[tsr2185]

My smart had a bad rattle when idling. Engine mounts were the first thought. Nope, a folding warning triangle in a plastic box behind the passenger seat joining in with the typical three cylinder idle vibes.

My problem was I was told to check everything before opening diff, guess I wasn't thorough enough. Now I know I got fresh fluid back there with a new gasket. PO had used a TON of rtv and it was a pain to remove and wire wheel off.

 

[Pinger]

My problem was I was told to check everything before opening diff, guess I wasn't thorough enough. Now I know I got fresh fluid back there with a new gasket. PO had used a TON of rtv and it was a pain to remove and wire wheel off.

That's what I was kinda thinking - in at the deep end. It won't hurt that the diff got fresh oil though. Every cloud... and all that! Best of all - your rattle has gone.

 

[Caman96]

That's what I was kinda thinking - in at the deep end. It won't hurt that the diff got fresh oil though. Every cloud... and all that! Best of all - your rattle has gone.

Wait…what was the rattle? Fluid change didn’t eliminate it.

 

[fancyTBI]

Wait…what was the rattle? Fluid change didn’t eliminate it.

Sounds like exhaust hanger. Post #22.