How do you remove the backing plate from an '05 Chev Venture rear hub so the hub can be replaced?

Yes the hubs need to come off
heat the bolts and let them cool down and try to remove them if they break drill them out

Wheel Bearings

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Adjustment

2002-05 Models

1. Before servicing the vehicle, refer to the precautions at the beginning of this section.
2. Remove or disconnect the following:
   
   Rear wheel Brake drum Hub cover Cotter pin Lock nut cover
3. Adjust the locknut to achieve wheel bearing play of 0.001-0.006 inches (0.025-0.152 mm).

Removal & Installation

2002-05 Models

1. Before servicing the vehicle, refer to the precautions at the beginning of this section.
2. Remove or disconnect the following:
   
   Rear wheel Brake drum Hub cap Cotter pin Lock nut cover Lock nut Wheel bearing retainer washer and the outer wheel bearing Hub assembly Grease seal Inner wheel bearing
3. Clean and inspect the wheel bearings and races for unusual wear or damage. Replace parts as necessary.

To install:

1. Pack the wheel bearings with grease for assembly.
2. Install or connect the following:
   
   Inner wheel bearing Grease seal Hub assembly Lock nut. Adjust the locknut to achieve wheel bearing play of 0.001-0.006 inches (0.025-0.152 mm). Lock nut cover Cotter pin Hub cap Brake drum Rear wheel
   

Remove the rear wheel, if the vehicle has rear disc brakes remove the brake caliper and brake rotor, If the vehicle has drum brakes , slide the drum off. Remove the 4 hub mounting bolts located on the back side of the backing plate.Using a hammer tap on the hub assembly (near the wheel studs) Reverse the steps to install the new hub assembly.

Remove the brake drum, remove the plate that holds the axle to the brake backing plate. The nuts are under the hub flange (where the wheel studs are), there is a hole in this flange to insert a socket on an extension. (you will need to rotate the hub flange to reach all four nuts.) After you get these nuts off, attach an axle puller (slide hammer) to the hub and pop the axle half-shaft out. Take this to a machine shop and have them press the old bearing off and press the new bearing on. Slide the half-shaft back in, and reinstall the nuts.

Might as well replace both bearings (left and right sides) while you are at it. Mark which side the axles come out of, often they are not interchangeable.

Sometimes you can rent or borrow the axle puller from a major chain auto store such as Checker or Auto Zone. They should be able to recommend a machine shop also, if they don't have the correct press.

REAR BEARING IS A HUB ASSEMBLY. REMOVE TIRE AND BRAKE CALIPER THEM REMOVE BRAKE ROTOR. ON THE BACK SIDE ON BACKING PLATE THERE WILL BE 4 BOLTS REMOVE BOLTS SLIDE HUB BEARING OUT AND INSTALL NEW HUB.

On the inside trim, you can remove screws that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls.

Remove Both Wheel and Drum Look for 3 or 4 Torx type Bolts at front or back of Backing Plate , Remove theese Bolts to Remove the HUB, Reverse To Install.
P.S. It may takje A Hammer to Get Hub off After Bolts.

Dana or Ford axle?

Ford here:
SECTION 205-05: Rear Drive Halfshafts 2002 Explorer/Mountaineer Workshop Manual
REMOVAL AND INSTALLATION Halfshaft
Special Tool(s) Protector, Differential Seal
205-506 Remover, Front Wheel Hub
205-D070 (D93P-1175-B) or equivalent Remover, Halfshaft
205-502
Removal and Installation
NOTE: This procedure applies to both rear halfshaft assemblies.

1. CAUTION: Do not loosen the rear axle wheel hub retainer until after the wheel and tire assembly are removed from the vehicle. Wheel bearing damage will occur if the wheel bearing is unloaded with the weight of the vehicle applied.
   With the vehicle in NEUTRAL, raise and support the vehicle. For additional information, refer to Section 100-02 .

1. Remove the rear wheel and tire assembly. For additional information, refer to Section 204-04 .

1. NOTE: Have an assistant press the brake pedal to keep the axle from rotating.
   Remove and discard the rear axle wheel hub retainer and the washer.

1. CAUTION: To prevent damage to the brake hose, do not allow the disc brake caliper to hang suspended from the hose.
   Remove the brake disc.
   1. Remove the two bolts and lift the disc brake caliper and brake pads off the brake disc.
      • Using mechanics wire, position the disc brake caliper out of the way.
   1. Remove the brake disc.

1. Remove the bolt retaining the parking brake cable bracket to the frame.

1. CAUTION: Cover the stabilizer link bolt threads and the nut to prevent boot damage when removing the halfshaft assembly from the vehicle.
   Using a rubber hose approximately 37.5 mm (1.5 in) long, cover the stabilizer link bolt threads and nut.

1. WARNING: The bolt that retains the upper ball joint to the knuckle is longer and it has fewer threads than the bolt that retains the toe link to the knuckle. Switching these bolts during installation will prevent the pinch arms on the knuckle from correctly retaining the toe link to the knuckle. This may cause the toe link to separate from the knuckle during vehicle operation. Failure to follow these instructions may result in personal injury.
   Remove the pinch bolts and disconnect the toe link and upper ball joint from the knuckle.

1. CAUTION: Support the rear suspension upper arm to prevent boot damage when removing the halfshaft assembly from the vehicle.
   Using a wood stick, approximately 450 mm (18 in) long and 25 mm (1 in) wide, support the rear suspension upper arm.

1. CAUTION: Do not use a hammer to separate the outboard CV joint from the hub. Damage to the threads and internal CV joint components may result.
   CAUTION: Once the outboard CV joint separates from the hub the knuckle will continue to pivot until the brake backing plate presses against the suspension lower arm. To prevent damage to the brake backing plate, immediately after separating the outboard CV joint from the hub, rest the knuckle on a cushioned support that is tall enough to keep the backing plate from pressing against the suspension lower arm.
   Separate the outboard CV joint from the hub and rest the knuckle on a cushioned support.
   1. Using the special tool, press the outboard CV joint until it is loose in the hub.
   1. Remove the special tool.
   1. Separate the outboard CV joint from the hub.
   1. Rest the knuckle on a cushioned support.

1. CAUTION: Do not damage the axle shaft oil seal or the machined sealing surface on the inboard CV joint housing.
   CAUTION: Do not allow the splines on inboard CV joint housing to touch the axle shaft oil seal.
   NOTE: A circlip retains the inboard CV joint housing to the differential side gear in the axle.
   Using the special tool, disengage the inboard CV joint housing from the differential side gear.

1. CAUTION: To prevent damage to the axle shaft oil seal, install the special tool before removing the inboard CV joint housing from the axle.
   Install the special tool.

1. Remove the halfshaft assembly from the vehicle.

1. CAUTION: To prevent damage to the axle shaft oil seal, install the Differential Seal Protector before positioning the inboard CV joint housing in the axle.
   CAUTION: Always install the halfshaft with a new retainer circlip and a new rear axle wheel hub retainer.
   CAUTION: Never use power tools to tighten the rear axle wheel hub retainer.
   To install, reverse the removal procedure.

Removal Procedure Tools RequiredJ 38400
Caution: Keep fingers away from rear brake shoe springs to prevent fingers from being pinched between spring and shoe web or spring and backing plate.

1. Remove the brake drum. Refer to Brake Drum Replacement



Notice: Do not over stretch the adjuster spring. Damage can occur if the spring is over stretched.

2. Use the J 38400 in order remove the adjuster spring (1). Disengage the adjuster spring loop from the tab on the adjuster actuator.
2.1. Remove the loop end of the adjuster spring from the adjuster actuator. 2.2. Remove the straight end of the adjuster spring from the secondary brake shoe.



3. Use the J 38400 in order to spread the brake shoes apart.
4. Remove the adjuster.

Installation Procedure

1. Use the J 38400 in order to spread the brake shoes apart.



Important: Ensure that the adjuster (2) engages the brake shoes (4 and 5), the park brake actuator (3), and the adjuster actuator (1) properly.

2. Install the adjuster.



Notice: Do not over stretch the adjuster spring. Damage can occur if the spring is over stretched.

3. Install the adjuster spring (1).
3.1. Install the straight end of the adjuster spring into the secondary brake shoe. 3.2. Install the loop end of the adjuster spring to the adjuster actuator.
4. Install the brake drum.