3/4 ton differential swap

[Mako]

I have gone threw 2 right main rear outer bearings in less than 3 years. I also hear others complain of the bearing whine.
I was wondering if its possible to swap a 3/4 rear main for the one I have.
I tow a 5k lb boat. I like the suv but the rear is weak for hauling.
Appreciate your thoughts!

 

[tonydiv]

It would really help if we knew what your current set up is.

 

[Mako]

Sorry and thanks for the kick! Nothing fancy here...
2000 5.4 EB 4wd Automatic
I removed to air suspension and put in coils...

 

[tonydiv]

Doesn't that already have the 9 3/4" axle under it?