johnnyfever
Newbie
I bought a 1988 Chevy 30 RV with a TH 400 transmission and a 350 engine, and I'm having a problem on the highway. The trans fluid is at the proper level and appears healthy. It shifts great and seems to be working fine until I run it on the highway for a bit. At about 65 miles per hour it will do a slow downshift into second gear with no change to the accelerator pedal. If throttle is further applied, it eventually will shift back into 3rd gear. The downshift doesn't happen at WOT, just a steady speed on a flat road. The person I bought the RV from put a new carburetor on it, and I'm trying to figure out the kickdown control. I'm trying to sell the RV and would like to repair this problem, not pass it on to the new owner. Any input or ideas will be greatly appreciated!