You probably either installed the hubs improperly, or used too much grease inside the hubs and they are sticking. Tear them back apart and re-check them. I have some links on my site to some good rebuilds

http://home.4x4wire.com/adamf/88/hubrebuild.htm


88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride