Hey Bernie, since you essentialy have the same truck as me. Is there anything I should do while I have the dash out? Ac blower resister has been replaced already and I found a bad ground for the blower fan I need to fix. What else should I do?
That depends... How much money you willing to spend?
While you have the column down would be the perfect time to replace the multi-function stalk (turn signals, wipers, high beams, etc.) because those things are a mother to replace and a very common part to fail. They're pricey though. Expect to pay $150 & up for a decent one, depending on if you have cruise control or not. If you do, bump the price up about $50.00
Fixing that bad ground is a good idea, and so would be adding a couple of plugged holes to the firewall, in case you want to upgrade the stereo later, or do anything else that involves running wires through the firewall. Much easier to drill the holes now and just plug 'em for the time being.
Upgrading all your dash lights and under dash floor lights to LED would be a good idea now. I did most of the lights on my truck with LEDs and it made a big improvement in the quality of the light.
A/C controls on these trucks are also notorious for fWONking up. On mine the recirculation control does nothing, doesn't even light up, so the next time I pull the dash I'll be looking at that. I forgot to do it the first three times.
On another forum I belong to a fellow was rebuilding an older Blazer, and while he had the dash out he took the time to do a little fiberglass refabrication, adding a nice area for his radios and a police scanner. You could use the same area for a flat screen display and DVD player, or a backup camera display, GPS, etc. Let me see if I can link a picture:
You might even want to consider repainting the dash while you have it out.