12.7 Detroit. Had a Rtloc-160909-At2 trans in it. It was pulled out and replaced by a rtlo-16913a which is an exact replacement. I did not take the speed sensor out of the old transmission. The harness has two plugs for a four wire sensor. The harness also has a three wire plug that was plugged into the old sensor. I have looked, tried a two wire and 4 wire with no luck. Truck pull us up to about 16-1700 rpm and stumbles. No speedo, no cruise. I cannot for the life of me find the 3 wire bolt down push in sensor. And help?