Hey Cashin. . I put a Posi in my 97 Ram 2500 Diesel in 2003, 103 K miles ago, it has worked great for me. a couple of things though, 1/ my truck is a 2 wheel drive. 2/ you must add a slip fluid to your lube (Amsoil has it), 3/ It is a SOB getting the diff. back into place without a case spreader . I purchased the unit from Randy's Ring & Pinion.
You should be able to find the link in your search engine. . If not. . let me know, my son in NH buys rear end stuff from them all the time and I can get the address from him.