awhile back I had a thread on down grading obd2 to obd1. My case was 98 pickup. 305 Vortec and 4l60e. Wanted to downgrade to 7427. Several pointed out the differences that changed the 4l60e 97-98 and I dropped getting the truck. Now the truck has been given to me. It is 16258825 with ccsd bin. Now I am thinking of piggy back using 7427 for fuel and timing and leaving the 8825 for trans. Is my thinking plausable or flawed. I would be changing fuel delivery and ignition as the failed spider is why the truck doesn’t run.