Yes, every 30k for the transmission. However, for the transfer case, on page 38, the only two operating conditions which call for any special transfer case maintenance are operating in dusty conditions and operating off road. In all other cases, the t-case is *supposedly* lubed for life (just like the axles, wink-wink). Changing the fluid every 60K is excessive for normal on-road operation. IMHO, no more often than 100k is necessary.
-Joe