2005 gmc 2500 hd needs front rotors at 23,000 miles cause there're rusted out. How do you change?

Your shop is lying to you. They would cause front tire wear, but not rear.
murf427

There is no thinking at all here

If you never polished the hub & rotor
clean & applied anti-seize in the past,
it is rusted on.

Spray center hole of rotor with penetrating
fluid & hit the rotor with the end of a wood 2x4

they have a extnded warranty on the speedometer cluster 7 years or 70,000 miles

SEAL COULD BE LEAKING CAUSE YOU DIDNT LUBRICATE THE SEAL LIPS WITH PETROLEUM JELLY TO HELP THE THE SEAL LIP SEAL OR YOU DAMAGE THE SEAL WHILE DRIVING IT IN.AXLE FLANGE NUTS TORQUE IS 58 FT LBS THE AXLE HUB NUT TORQUE IS 177 FT LBS.

No it's not too hard. Just needs spring compressor, and socket set.

check in front of radiator

The rotors are one with the hub.s, So, you need to pull the axles , hub bearings. Good Luck

They should just come off. but may need some hammer to assist. they tend to rust up like most other rotors. nothing special needed.

Thats it ,oh and a hammer to knock it out of the knuckle.Some guys tighten the axle nut back up with a torque wrench.

after removing the wheel &caliper depending on rust build up you may need to hit the rotor between the wheel studs this may take some time after removal check for rust build up on hub remove rust with hammer, sanding&scraping put some anti seize lube around hub making sure no rust is caught in between depending if you are replacing the pads you have to push the caliper piston back with a large pair of chanel lock pliers or suitable tool,then you can reassemble.thanx from schleck