It sounds like you have the same problem as me.Your truck starts to buck at about 40mph and about 2k on your tach ? I believe it's a short between the speedo and tach.I have tried a new vss and removed my panel thinking it was a loose connection.Also checked my wiring for open wires and found none.There is a member on here that is having the same problem and is buying a new instrument panel from ebay to see if it finally resolves our problem.There is a thread about it going on now.Follow my posts and you will
find it.just a few posts below yours....Good luck.
For now when the problem returns you can put in neutral,rev it up a little and
that will keep you going till the next time.
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