transmission not going into drive please help

ok guys yesterday i did my gear swap from 3.727 to 4.56 got the 3rd member put in and axles put back in place all bolts tightened i put the gear oil in and put hubs back on and cranked the truck up let it idle then shifted into drive without the tires on just to get it good and lubricated then accelerated to 20, 30, 40 and 45 and everything seemed fine so i turned the truck off mounted the tires cranked it up and put it in drive but the truck would not move it would only drive in the lowest gear no slipping it drove perfect in that gear and in reverse but would not move forward in drive, 4, 3 or 2 what is my problem?