Hello all! I am new to the forum but have read through quite a few threads and have found a lot of great information. I have a problem that I hope someone has dealt with before, and would appreciate any insight to get it figured out.
I have a crew cab short bed 99 obs chevy 2500 4x4 with a 5.7 and 4L80. The truck had been neglected when I bought it, but I've worked through almost all of the issues and its pretty nice now. However, the torque converter does not lock up in overdrive, and the cruise control does not work. The transmission shifts perfectly in all gears, just doesnt lock up in OD. I have replaced the brake switch, engine temp control sender, throttle position sensor, have traced wires under the dash, removed the trailer brake controller, checked all fuses, had the transmission rebuilt with new harness and new torque converter, swapped speed sensors, made sure all lights are working (read somewhere that 3rd brake bulbs being out could affect lockup, although I don't really buy into that theory). When hooked up to a scanner, it says that the cruise control is disabled. I'm inclined to believe that the two issues are related, and that it's an electrical problem somewhere. Have any of you experienced something like this? Any thoughts on what I should check into next? Thanks in advance! -David
I have a crew cab short bed 99 obs chevy 2500 4x4 with a 5.7 and 4L80. The truck had been neglected when I bought it, but I've worked through almost all of the issues and its pretty nice now. However, the torque converter does not lock up in overdrive, and the cruise control does not work. The transmission shifts perfectly in all gears, just doesnt lock up in OD. I have replaced the brake switch, engine temp control sender, throttle position sensor, have traced wires under the dash, removed the trailer brake controller, checked all fuses, had the transmission rebuilt with new harness and new torque converter, swapped speed sensors, made sure all lights are working (read somewhere that 3rd brake bulbs being out could affect lockup, although I don't really buy into that theory). When hooked up to a scanner, it says that the cruise control is disabled. I'm inclined to believe that the two issues are related, and that it's an electrical problem somewhere. Have any of you experienced something like this? Any thoughts on what I should check into next? Thanks in advance! -David
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