How do I remove rear rotors

Being a 3500, I'm guessing it's a dually? The axle MUST be removed to take the rotor off. Remove the 8 bolts on the axle flange, then carefully remove the axle. Behind where it was, you'll find a snap ring. Remove that and pull the key block out. Using a brass punch to knock it loose, unscrew and remove the spanner nut, then the outer wheel bearing. After you do all that, you can remove the rotor.

If you truck has a standard rear axle just remove the caliper and caliper adapter bracket, then the rotor will pull off. Sometimes if the hub face is rusted it may take a little persuasion to come off. You can hit it with a ball peen hammer between the wheel studs, this is usually enough to free it. If you have a dually you will need to remove the axle shafts first by removing the bolts around the outside of the axle housing then pull the shafts outward. Then remove the caliper and caliper adapter. Slide rotor and hub assembly off of axle, then unbolt the the hub from the rotor.

you will have to take hubs off and usually on the back side there will be bolts that hold rotors on

This is a big job for such a small part. I suggest you repair/replace rotors, pads, and anything else back there while you are at it. You will need to remove both wheels on both sides, as well as the axles (I think). See my earlier post on Rear Rotor removal to see how this is done.

You will need a large spindle nut to remove the axles.

DISASSEMBLY:
Once you have access to the parking brakes inside the rotor hat:
1. Lock out the parking brake w/a pair of Vise grips (on the parking brake cable under the cab)
2. Disengage teh park brake cable from behind the rotor assembly to allow easier disassembly of the parking brake shoes.
3. Disassemble the rear park brake shoes.

REASSEMBLY:
1. Reassemble the rear parking brake shoes. This is a typical, small brake drum configuration. Do one side at a time - so you can see how to reassemble each small part. Keep the springs and parts oriented the same: front to front and interior to interior, etc.
2. Release the parking brake cable
3. Install the disc brake rotor(s)
4. Install the disc brake caliper(s)
5. Install tire & wheel assembly
6. Lower the vehicle

after u remove the tires then the caliper bolts remove caliper and look on back side of rotor you will see 2 bolts that support the caliper remove those and the rotor should slide off

2WD pickups don't have hubs. They have rotors with bearings. Once you have the brake assembly supported, remove nut from spindle. Be sure not to strip the threads on the spindle. Remove the front set of bearings and pull the rotor off. Remove the rear set of bearings. Be sure to pack greases into new bearings prior to installation. Insert new rear bearing into rotor and replace onto spindle. Insert new front bearing and washer and re-install nut. Tighten to recommended torque specs, grease fittings and replace brake assembly.

You have to remove the axle shafts first as it has a full-floating axle, then pull rotor and hub off the axle housing. Unbolt rotors from hub. Check bearings and seals in hubs and the axle snouts where the bearings run before installing. Put new flange gaskets on axle and torque flange bolts to 95 ft-lbs.

REMOVE THE RUBBER PLUG IN BACKING PLATE AND ADJUST E BRAKE SHOES DOWN TO REMOVE ROTOR

The rotor and hub assembly are held together by the studs,you must first remove the 4-wheel drive hub assembly,then the wheel bearing nuts,and pull the hub and rotor off as a unit. Next lay it(back down) on a piece of wood, using a drift punch drive the studs out. Turn it over ,lay it(face down) on a block of wood, line the new stud splines up with the grooves in the hub and drive them in with the punch and reassemble. A set of dentist style picks will be helpful with the clip in the 4wd hub and a 4 lug 4wd nut wrench will be needed.

Remove caliper and nut to axle should come of with a little help of a rubber hammer. Knock bolts out from the front and drive new ones in from the back. You can use a lugnut with the flat side down to help pull them in and a hammer to help. Hope this helps.