My husband is replacing the wheel barrings on 2000 chevy silverado and is having trouble taking the rotter off. is there a trick. and does he have to take that cap off?

Go to www.youtube.com lots of videos on the subject ! a picture is worth a thousand words , what's a video worth ?

This video should help. It's a 2000 Silverado but is probably the same as yours.
2000 Chevy Silverado 1500 front brake pads rotors replace

The steering wheel has to be removed and further troubleshooting to replace or replace the column or wheel can be performed.For complete step b step procedure.Click the link below :----http://technoanswers.blogspot.in/2012/02/chevy-silverado-2500-hd-steering-wheel.html
-----------This will help.Thanks.

once all the lugnuts are removed give the wheel a large kick,as it may be stuck onto the backing plate.(wheel hub)

you will have to have a lock plate compressor,lock plate has slots around the edge for the wheel lock,when you compress it there is a snap ring on the shaft that has to be removed

Pretty much a remove and replace item...no real trick to it. You may need to change the height to get the end links to line up but you can do that easily with a simple jack.

Fix your car right away, by clicking the link
2000 Chevy

call a locksmith out he can remove the ignition and replace it for about 60.00

I take it you have the manual t-case shifter on the floor. If so check all your linkages from the shifter to the t-case, if all appears well, simply disconnect the linkage from the t-case and see if it moves if it does your problem is in the shift mechanism in the t-case. if it still wont move even while disconnected clean and lube the linkage. If this still doesn't do the trick. replace your linkage

the shifter accuator or the wires going to it on the transfercase..gl