Hey everybody! Recently purchased a 98 1500, with 205000 on it. Changed the fluid twice and trans solenoid recently. I was going down the highway, at about 75, deaccelerated to take the off ramp to about 40-50, and heard a thump and the OD off light came on and stayed on all the way home. (after the highway, I was going 40 mph-ish tops) Got home just fine, turned off the truck and came back out with my code reader about 15 minutes later, turned the truck on and the light was off. Any ideas? Speed sensor? Maybe the fluid doesn't have enough grit for the clutch?