How do i install a transfer control module on a 2001 chevy silverado 2500hd

SOURCE: where is the horn located under the hood of my 2008 chevy truck?

Have a friend, (or in-law) someone you're not too fond of, stand in front of the truck while you honk the horn and have them pinpoint it for you.

SOURCE: 2001 Chevy 2500HD Whining

these transmissions have three sets of planatery gears the whining you hear is simply the gears doing thier job. You have to remember the allison trans is basically the scaled down version of the heavy duty isuzu truck trans they are designed more for thier load capacity then for comfort

SOURCE: 4 wheel drive on 02 chevy silverado not working

There is a solinoid on the front differential that shifts the front in and out of 4wd, that could be it.

SOURCE: installing CD player

here is the wiring schematic.
Constant 12V+ Orange Switched 12V+ Yellow Ground Black Illumination Gray Dimmer Brown Antenna Right Window Trim Front Speakers 6 1/2" Doors Left Front (+) Tan Left Front (-) Gray Right Front (+) Light Green Right Front (-) Dark Green Rear Speakers 4" x 6" Side Pillar Left Rear (+) Brown Left Rear (-) Yellow Right Rear (+) Dark Blue Right Rear (-) Light Blue

And you will need a Wire harness... Metra #GMRC-LAN-01
And a mounting Kit Metra #99-3305
And antenna adapter Metra #40-cr10

This is for the basic radio... if you have upgrade NAV/Onstar/Premium sound.... there are different wiring harnesses available.

Let me know if you need more help.

SOURCE: 2001 chevy sylverado 2500hd power steering and power brakes quit

check power steering fluid. first. if all good . power steering is going. your hydro boost brake system depends on the power steering pump if it goes out your brake go out.