For the last few week's I have been having the rear axle fluid leaking under my truck its sprayed all under the bed and on the end of my exhaust and I
can smell it burning on my exhaust when I drive.I bought some fluid and filled it was low and have to refill it once a week for the last 2 weeks. But I don't see any leaks when i check under the truck its just under the bed and on the exhaust from the muffler back..Where could it be coming from?

 

I think you are describing a pinion seal failure.

 

You might have a loose pinion, that was a problem for that rear axle in those years. I'd fix it immediately, letting that rear end get dry isn't good - and if its loose it'll destroy your ring/pinon in a hurry.

 

^^^Agree. Sounds like it may be the pinion seal.