First off, stay away from the quickie lube shops! Find an independent shop not associated with a chain.

Second, what is the condition of the old fluid? If it is thick, black, gunky looking and has a strong burned smell to it, you may have problems with new fluid.

Transmission fluid has a very high detergent level. If your old fluid is really bad, the new fluid will clean out all the old build-up around the seals and gaskets and may soon start to leak. Particles of this build-up now floating around could get into the valve body and cause shifting problems. The new fluid will react with the old brittle clutch material and cause them to flake.

My suggestion is to pull the pan, check for any foreign matter in the pan and filter. If there is none, then change the fluid including the torque converter. If there is a lot of trash in the pan, you are probably near a rebuild. Just button it up with a new filter and pan gasket, fill it to the proper level, and run 'til it gives you problems.

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'94 E-150 Conversion Van 4.9 / C-6 -- '89 Mustang LX 5.0