thanks guys
i checked patricks already. they have nothing for the 3/4 ton and advised me to do the 4:10 swap
i'll checked carters web catalog and they don't specify 1/2 or 3/4 ton. i'd bet their ring and pinions are 1/2 ton
i'm sure someone on this site would have done a 3:90 swap using carter by now
anyway i'll check today
thanks again
rolf