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no...combination (proportioning) valve is the same 94-96, all models, disc or drum rear
You may not realize this--to swap in the 9C1 rear axle, you will end up with the rear wheels sitting deeper in the wheel opening on each side by 5/8".
Also, gear ratio will be different and you will need to do a PCM reflash to correct speedometer.
You can take the disc brake system components off of the 9C1 axle and just transfer them to the B4U axle, too.
You may not realize this--to swap in the 9C1 rear axle, you will end up with the rear wheels sitting deeper in the wheel opening on each side by 5/8".
Also, gear ratio will be different and you will need to do a PCM reflash to correct speedometer.
You can take the disc brake system components off of the 9C1 axle and just transfer them to the B4U axle, too.
