I went to have my muffler replaced with a Flo-Pro twister today and my rear differential looks to have leaked a lot of fluid from where the drive shaft enters the differential. It has soaked the metal and is substantially darker forming a downward and outward soak pattern. I would guess it happened while I was driving at speed or it would have just been a line straight down. There doesn't seem to be any fresh fluid so it may have happened when I was towing in the summer when the temperatures were much higher. I have made an appointment at the dealer but would like to know what kind of tricks they might play on me? What should I demand to see or expect them to replace? I also told them to order an alternator bracket as mine has a small hair-line crack in it.

Any advice would be appreciated.

BTW, the Flo-Pro Twister will not fit on the stock Cummins exhaust as we have step mufflers from the factory. So, looks like I’m in the market for a complete exhaust.

Also, 2003 QC DRW 3500 HO 3.73 6 Speed

 

i have had 2 rear pinion seals installed in mine in 11,500 miles!

 

maybe coming from the diff vent tube ? I'm not sure where it exits...

Ron W.

 

Mine seeps slightly around where the vent tube enters the top of the case...

 

I noticed the same oil resdue on my rear end around the front were the drive shaft. The truck had ~5,000 miles on it when the dealer replaced the pinon seal. The other day I noticed it was now dripping. So, that means it will be going back agian to have it fixed and the truck now as 6,000 miles on it. I beleive it was not fixed correctly from the start because it is worse. I have had no problems with my dealer they replaced the alternator bracket the samme time they replaced the seal. This has been the only problem I have had with the truck. The truck is used 90% of the time towing our trailer and is not driven in the winter.

 

My seal was seeping as well. Went on a long trip pulling the 5th wheel(worried all the way) and it seems to have stopped. Knock on wood. No kidding a side, cleaned it with brake clean and she is still dry.

 

Oil leaks can be such a Pain ..if you dont see any fresh oil I'd suggest cleaning the area with some spray on engine cleaner at the carwash and checking for any new stains..seals sometimes leak and then reseal..check b4 you take it to the shop..a trick that has served me well for many years is to add the proper proportion of seal expander/ stop leak to all components in the drivetrain...i use an auto transmission stop leak in my transfer case and engine oil stop leak in tranny and both diffs as well as engine..just make sure the % is right for the amount of oil in the component...since I started doing this I have not had one seal leak in over 400,000 miles on various trucks..the stuff keeps the seals live and swollen and for a matter of a few bucks its one of the best tricks I ever picked up