If you haven't gotten a rebuild yet and it has at least 100K on it, I'd be on the safe side and save up to get it rebuilt. It probably needs it and who's to say that that ISN'T the problem. Like I said, maybe I just have bad luck with transmissions. By the way, the speed you're saying in your post is a few miles an hour less than the tranny would kick into overdrive. Normally (at least on the V8 trannies I've had), the tranny kicks into overdrive around 41-43 mph. If you let the speed slow down a few mph's, then give it just enough gas to hold speed, it shakes. That's why I just kept my trannies in drive until I would hit around 45-50 and I knew I'd be holding that speed for a little while. Hope this helped you out.
Rick
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