needing to either rebuild rear end or get new one

No need to touch the pumpkin (chunk) if your axles seals leak.

If you lower the fluid level it can slow a leak but it'll most likely still leak.

When I changed the fluid in the rear end when I got my truck it was like 2 quarts overfilled. It was all oil not mixed with water or anything. I'm still trying to figure out how someone managed to get the extra 2 quarts in there lol!

Wow, must have been full to the top!

^^ Yea wow!! I love these sites... you learn something new every day! I never woulda thunk the chunk was over-filled.

There is a hole on the side of the case that needs to be open when you put fluid in the differential so that the excess fluid can run out. The fill hole on the back is not supposed to be the final height fluid hole.