Here's an older link on rebuilding a Dana 45. Looks as though most parts from a 44 will work.

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=924828


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket