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I believe that your shudder problem may be a problem with your lock up torque convertor. When your transmission has shifted into final gear and is no longer under accelleration or deceleration your torque convertor should lock up. If the lock up is not being applied properly of your torque convertor is damaged you may experience a shudder during the lock up transition. You should be able to initiate lock up on and off by accelerating and coasting to see if this is when it occurs. I have put 45000km's on my '94 Transport since it was given to me because of this prob. If you can live with the annoyance it shoudn't damage anything else and you'll save some cash. Good Luck. ==Another Option == Twice I was told by a transmission mechanic that my shuddering was due to bad plug wires. He showed me this by power braking the car and having the engine get "rough" at certain RPMs. Changed the plugs and the wires, voila`, the back ones are a pain in the butt!

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Q: 93 Pontiac transport 38 around 2000 rpm appears to be a shudder from transmission or on gear change and rpm drops to 2000 transmission?
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