what would cause a trans "thud" sound when going from 1st to 2nd on automatic

Asked by Jun 01, 2012 at 12:28 AM about the 1998 Chevrolet Chevy Van

Question type: Maintenance & Repair

1999 astro van, at times, the transmission will "thud" as it changes from 1st to 2nd. It usually won't do it if you are just driving around town, but get out on interstate driving 65 mph and when getting off interstate everytime you stop and have the start up from a roll or complete stop the "thud" happens again. If I am just driving around town and speed has been maintained to 45 or below this never happens. {the "thud}  It has just started getting worse in the last month. What can it be and how much will it cost me?

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First thing to check to see if the fluid is at the proper level, a low fluid level sometimes causes shifting issues. Look in your owners manual for the proper way to do this, the vehicle has to be warm and on a level surface and in park running. If that checks out, how is your fluid, dark and brown? Maybe time for a fluid /filter change? But worst case is you have to open the transmission up and your talking about a rebuild. $1500-$3500.

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