can you change the abs sensor on the front of a 99 4x4 3500?

 

yes

FRONT WHEEL SPEED SENSOR - 4x4

REMOVAL
1.Raise and support vehicle.
2.Remove wheel and tire assembly.
3.Disconnect the ABS wheel speed sensor wire from under the hood. Remove sensor wire from the frame and steering knuckle.
4.Remove brake caliper.
5.Remove rotor on models with 5 wheel studs. On models with 8 studs remove rotor hub bearing assembly and separate the rotor from the hub bearing.
6.Remove bolt attaching sensor to the hub bearing Wheel Speed Sensor - 4x4
7.Remove sensor and wire

INSTALLATION
1.Install the sensor in the hub bearing and tighten the bolt to 14 N·m (11 ft. lbs.) Use original or replacement sensor bolts only. The bolts are special and must not be substituted.
2.Install the rotor on models with 5 wheel studs. On models with 8 studs install the rotor on the hub bearing and install the assembly on the knuckle.
3.Install sensor wire to the steering knuckle and frame. Connect the wheel speed sensor wire under the hood.
4.Check sensor wire routing. Be sure wire is clear of all chassis components and is not twisted or kinked at any spot.
5.Install brake caliper.
6.Install wheel and tire assemblies.
7.Remove support and lower the vehicle.
8.Apply brakes several times to seat brake shoes and caliper piston. Do not move vehicle until firm brake pedal is obtained.
9.Verify sensor operation with scan tool.