in another thead i posted about doing a rear swap on my 42 ton and a half i have...ive been thinking about it and have decided to leave the factory 2 speed under the truck if the gears are not to steep..ive locted a later model wheel to swap tp a 19.5 from the factory 20 if anybody is interested the wheel numbers are for steel accuride wheels #29667 and in alcoa aluminum# 76100..these wheels are made for p-30 box vans and they bolt right up...but any way is there a way to check gear ratio without pulling hoghead ?is there a number casted on the housing some where please give me all info you can ...thanks for all your help