i have noticed not only on my truck but on many others, that the rear axle on most of these trucks looks like it has a leak. i always have my axles serviced when i change my oil, so i would think if any of my axles were leaking they would let me know. perhaps it is just a build up or road grime and oils from the road that are gathering on the rearend. i have never noticed drips or oil stains on my driveway.

 

It's common on a LOT of trucks.

I suggest giving your differential a thorough cleaning (pressure washer, some simple green, and maybe even a scrub brush) so you can get a fresh start.

Then watch to see if it starts to get dark and wet looking again. If so, it may need to be re-sealed, or possibly have the housing "sanded" and sealed.

 

look at any older truck there is almost a stain on the cover from when the fluid was changed. it can stay there for years. gear oil is tough stuff. the cover could have a tiny pinhole rusted thru and is leaking. had a oil pan that did that once.usually rear end leaks at the axle seals in to the drums from what ive experienced.

 

Yeah, a Tuffy guy said my rear axle seals are leaking. The quote was $150. I havent had it done yet though.

 

Nobody likes a leaky rear end.

Edit: Sorry couldn't help myself

 

is that seals for both wheels?? 150$ doesnt sound to bad. the seals are like 15-20$ each. 1-2 hours labor. jiffy lube and those chain places charge 80- 100$ for a differential fluid change.now thats a rip off!!

 

Lets see; $10 for gear oil, .50 worth of sealant. 5 mins to take the cover off and 5 to put it back on. Ya, $100 sounds about right

 

150$ for to replace both axle seals which means you have to take cover off anyway and put new fluid and gasket on. 150$ isnt bad.

 

If his differential requires 75W140 synthetic fluid,minimum for a quart is $10! And it holds 2.75 quarts (8.8 differential).Oh,if its L/S,add another $4-$6 for the friction modifier!

 

My only point was $100 for 10 minutes work is nuts