Could be a flex plate crack, too.
97T
> > Hi: Any suggestions?
>
> It could very well be a sticking lifter. I have a hard time
> thinking of a transmission making a tapping noise. I had
> a tapping that would come and go on my E350. A good
> engine flush (Gunk) broke down enough of the varnish
> to clear up the problem. It's a cheap test.
>
> -Jeff Deeney-
>
>