How long's it been leaking, sounds like it got low on oil.
Hopefully it hasn't messed up the gears.
Why has the oil been changed more than a few times in only 220,00 kms, Dana's recommended change interval with synthetic 75-140 is 288,000 kms

 

 

We changed the gear ratio in mine at 160000 kms which was also first oil change.
Only 40000 kms since so won't be getting the oil changed for some time.
FYI the pinion nut torques on at 625 lb ft of torque, also the 3rd member will have to be removed to replace the back pinion bearing, that 3rd member weighs around 150 lbs

 

Just wanted to follow up on this thread. I got the bearings replaced and the gears were ok still. He said the bearings weren’t all chewed up but just worn out. Guess they only last around 220 000kms. Doesn’t seem like a lot but it sees some pretty harsh conditions. Including lots of cold weather use, muddy lease roads and the truck weighs over 14000lbs. And also it’s tuned and deleted so I’m thinking that puts lots of extra stress on things. Glad it’s fixed up anyways.

 

Should have lasted longer, pulled one out of a donor truck with 300k+ miles in good condition.
Former utility company bucket truck, they go into some rough places.

Glad you got it fixed
Thanks for posting back.