thanks JD49 for the compliment. i put that steel deck HD bed on her a few years or so ago but thats gonna get sold, i have a 1962 Omaha Standard bed with round corners thats gonna replace it, it'll look more period correct. the diff in my 55 has the gear ratios stamped right on top,how'd i miss that, it is the 6.13-8.10 set. maybe a rear end swap to the higher geared GMC would be the way to go, the 5.83-8.10 GMC that crenwelge spoke of would probably get me 55-60 and the low side 8.10 would still give me the low-end grunt i already have. now its a matter of finding one thats not too far away.