Originally Posted by TransEngineer
Boy, this SM must have ESP or something! He can tell that your pump is bad by just riding in the truck with you? Sorry, but I don't think I'd buy that. A bad pump will typically cause line pressure issues, but you noted no fault codes (like P0868 Line Pressure Low) and never said that he checked the line pressure readings with a scan tool. I don't understand how he could think your pump was "bad" without checking these things.
It's probably too late now, but I would avoid having your pump replaced unless there is a definite problem. The converter noise issue is NOT a pump problem!! It is caused by excessive backlash in the turbine hub spline (inside the converter). It has nothing to do with the pump!
It is very easy (when replacing the pump by itself) to allow the input clutch thrust bearings (which are inside the next big "chunk" of parts behind the pump) to fall out of position. If this happens, you will have a complete transmission failure, generally 300-600 miles after the pump replacement. Unfortunately, this is one of the most common misrepairs we see in these transmissions.
So for the rest of you (with the converter noise), I'd recommend that you replace only the converter, unless there is an obvious issue with the pump. Replacing the pump "just to be safe" is actually a LOT riskier than just leaving it alone.
Thanks for the info, Trans, but it IS too late. I am waiting for a call now to go and pick it up. Not being a mechanic, I didn't even know about the pump there. As far as ESP, I think he was just replacing the pump just to be safe, like you stated. I guess time and 300-600 miles will tell. Just glad it is under warranty for another 4.5 yrs and 98,000 miles!!