Transmission Clatter

My '98 transmission makes a clatter sound when I really get on the gas. Under normal driving it is fine. While dealing with a major intake leak on my wifes Ford Windstar van her transmission made the same sound until I fixed it. It of course was a lot worse since her intake leak was severe and any acceleration made the transmission clatter. Now that the van is fixed the transmission makes no sounds at all.
Could I possibly have a vacuum leak somewhere causing this clatter in my transmission? 128,000 miles on the truck.
Ken

Anyone?

torq. converter my trucks doin the same thing though it only happens when im slightly on the gas.....theres kits u can pick up from ebay and etc or a trans shop like aamco, some times it solves it some times it wont but try the cheap thing first throw some lube graud in there....then if that doesnt fix it try that shuddler kit they make it has some springs and etc in it.....if that doenst do it then try a new converter im gettin ready to try the spring kit so i hope its ok