This is a Buddy from the club I run with. Truck is a mid 90's Burb. </font><blockquote><font class="small">In reply to:</font><hr /> The antilock problem is back and worse than before. After a little more investigation, I do have antilock sensors on each of the front wheels and no sensors on the rear wheels that I can find. There are no HAL effect pick-ups on the rear backing plates or inside the drums anywhere. I can find no wiring into the rear chunk for a tone wheel pick-up there either. Since I have antilock on the front and presumably on the back, I would like to keep it working. This was apparently an option on the 3/4 ton models - I was under the impression that it was only offered on the rear wheels as a single channel in '93. Anyway...the light is coming on and I get some exciting braking when "trying" to come to a stop - the system will start dumping pressure when I am braking on asphalt and all four wheels are turning the same speed! The only difference, is that the speedo doesn't start registering until the truck is rolling at about 25mph. It also uses a tone ring on the output shaft of the TX case. It was nicked fairly bad when I had the TX case apart to rebuild - but it still worked! Is it possible that the speed sensor that reads that tone ring is screwed up and that affects the antilock system? The warning light does not activate until the truck has been rolling for about 10 seconds. I tried driving down the insterstate while the speedo was registering, put the tranny in neutral, shut off the engine, and let it coast for a minute. I restarted the motor and put it back in OD and the light stayed off the rest of the trip. What do you guys think?? [/ QUOTE ] I think it's that sensor. Sounds to me like it is also used with the Anti Lock since he can't find a sensor on the axle. Any thoughts or anybody know thses mid 90's trucks with Anti lock better?