you may have a dana 60.
the 70 and 80 are much bigger cases that would take more fluid.

you don't want to overfill it, or fill up the axle tubes. it'll just leak out or blow out.

 

I think the amount you are missing is what is in the axle tubes. I've read how-to's on changing diff fluid were they will actually jack up each side of the truck one side at a time to let the tubes drain down into the pumpkin.

 

If it's coming out the fill holes you're good. Just keep an eye on it. Make sure it isn't leaking out anywhere, and make check and make sure it's staying full for awhile.

Also, I've heard you're not suppose to use synthetic gear oil with limited slips before, but that was probably just BS, but I figured I'd throw it out there incase it triggers someones memory of why...

 

I got the same thing when i took my truck in as well. I dont know which axle it was front or rear but my mechanic put regular oil in one of them. Just a though I think I would rechange my axle fluid.

 

Definitely a 70 on a 2500 with V10. After reading the replies I think I know what happened. I had one side of the truck raised when I drained it and put the cover back on. Lowered it to refill. Must have been some fluid left in the lower side. Also, according to Dodge, synth is OK for these axles and you still have to put in the friction modifier. What I don't get is the spec for 80-90 in the rear but the heavier 80-140 in the front that sees so little use.

 

My rear diff is pretty low, I think. How do you measure? And if it is low will it screw with your tranny. Like will it make your tranny slip or kick hard? And Fluid do i use in my truck. I have the 4:10 front and back

 

Well It will burn up the gears in the truck which I'm sure the tranny will feel the effects of that. The only way to tell is to open here up and drain the fluid. Unless there at dip stick in there. There is none! Drain it and put new it. better safe then sorry. Unless you want to shell out over 1,000 buck for new gears and labor?
http://pavementsucks.com/tech/diff.php

 

Checking the level is as easy as taking the plug out of the cover. The fluid should be level with the bottom of the hole with the truck on level ground. Top it off until fluid just dribbles out of the hole. I doubt a low level is causing problems with your tranny. If the level is too low eventually you could break something in the rear end, but it will be immediate. Your tranny problem sounds like something else.

 

Please refrain from posting if you have no idea what your talking about, which you don't in this case.

 

Oh so it wont burn up the gears why did I pay all that money to get them changed.