Hey guys, i bought a 1993 f250 7.3 idi non turbo (211k) with the e4od automatic (not original tranny, but the owner doesn't know when it was rebuilt or replaced). When i bought it, i was told it had issues with the fipl and vss sensor causing a flashing overdrive light and erratic shifts. I replaced them both in conjunction with a tach sensor, and calibrated the fipl. I also reset the PCM by leaving the batteries unplugged for a few days. The truck ran perfectly for about a month till i pulled in my driveway the other day, and noticed my overdrive light flashing. My overdrive was off, so it should normally stay solid. But it was flashing uncontrollably with no pattern. Everything works well though. If anything, i have a faster shift into 3rd and 4th around 40mph causing the engine to bog just a little. When i have the overdrive engaged, the light never flashes. Its only when i leave it out of overdrive, the light flashes with no pattern, but it runs and drives very well with no hard shifting. Any tips here guys? I'm thinking its an electrical issue, because this truck was well taken care of.