My father just picked up a previa van with 197K miles. when he starts up
no problem. when he puts in to gear is makes a knocking noise which goes away at higher speeds. in reverse out of neutral or park, makes noise. seems like anytime load is placed it makes the sound. I think maybe flexplate. any thoughts ? thanks in advance.

hi
what you are experiencing seems to be common in the previa/ estima model
please go to following site where info on how to do this job is given
good luck
steve
http://www.estimaownersclub.com/community/index.php/topic,56.0.html