How do you replace backing plate on a 1999 Chevy half ton with out having too remove axle?

You generally cannot replace a backing plate on a 1999 Chevy half-ton without removing the axle, or at least significantly disassembling the braking system to gain enough access. The backing plate is integral to the axle housing and brake assembly. While some minor repairs *might* be possible without full removal, a complete replacement necessitates significant disassembly.

Here's why:

* Space Constraints: The backing plate is bolted to the axle flange, and there's simply not enough room to maneuver a new plate into place without removing the axle or significant brake components (calipers, drums/rotors, wheel cylinders/calipers).

* Brake Line Connections: The brake lines are connected to the backing plate. To replace the plate, you'll need to disconnect these lines. While you can disconnect them, rerouting them while working in the limited space is extremely difficult.

* Wheel Cylinder/Caliper Attachment: The wheel cylinders (drum brakes) or calipers (disc brakes) are mounted to the backing plate. Removing them is required to access the plate for replacement.

In short: While some minor repairs or adjustments *might* be possible, replacing the entire backing plate is a job that almost always requires axle removal or at least the significant disassembly of the brake system. This is a job best left to someone with experience working on brakes and automotive suspension. Improper installation could lead to brake failure, which is extremely dangerous.