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I rolled around under there today... I don't think the manual transmissions have a speed sensor of sorts. The only sensor I can find is for the revers light and then another plug that is on the transfer case, but I think it is just for the dash lights and stuff? Maybe not.
Replace the rear axle one which I thought for sure was the problem. When the abs light was on, the rear axle was definatly locking in the snow. When light was off, rear ABS worked. Replaced the sensor tonight (75 bucks) and abs light still comes on.