Rear Brake Lock Up after Replacing Axle

[Off Road Advent]

HELP!!! I have a 1994 4x4 Exploer w/ 4Wheel ABS, I replaced the rear axle w/ a 1992 Explorer with all the same specs. Now, the rear brakes tend to lock-up under moderate braking, when that occurs, the ABS pump actuates to release the rear. What is wrong? Why are the rear's locking up under light pressure???

Thanks,
Ed

 

[MyExpWork]

Don't know if this makes any difference but didn't the 92s only have rear ABS?

Brian