Yes, they're compatible. But, what are your plans for this truck? If you want a hard core wheeler, I'd go with a th400 and a Dana 300 and a set of Dana 60's. Both are nearly indestructible. Dana 44's are good axles for moderate wheeling but can be beefed up to be very strong. If it's moderate wheeling you're planning, the 700r4 and Dana 18 will be fine.

Oh, welcome to the site.