2000 S10 ZR2. Ok so i got my new rear driveshaft in and decided to take my truck for a drive. i bought the truck a few months ago and just got it running.. 4-hi the front driveshaft doesnt spin at all and 4-lo works like it should. i dont have any dashlights on and i hear the transfer case engage. when i push the 4-hi button and the button stays lit as well. any ideas to what may be the problem?