I have a 88 chevy van with the 700r4. Lost second, fourth and reverse and had it rebuilt with the vette servo, more clutches in o/d and an rv converter. Shifts nice and firm and seems to be at the correct speeds, but here is the problem. With light steady throttle, usually around 30-35 mph, the converter will lock and unlock continuously until I either give it more throttle or less. I have also been noticing lately that it shifts into third (maybe also does it in second, can't remember) and immediatly locks the converter which bogs the motor and then unlocks right away. Very annoying to say the least. It went back to the tranny shop twice in the last 8 months.... Once for immediate 1-2-3-4 shift with no downshift, and was fixed. Second time was for what I described above and I was told it could be the governor and was replaced. The problem persists. Anyone have any ideas? It is tough to demonstrate the problem to the trans shop, cause as you know when you try to make something like this happen it just plain doesn't. Suggestions are welcome so I can throw hints to the shop about what to check. Only got 4 months left on the warrenty so I have to get this resolved.
Thanks all.
Brian