Hi there,
The first thing is to make sure that it is not being over filled with oil, next is the breather blocked, it is a pressure problem, may be a transmission service, change the filter, (it may be clogged) to start with, and if no improvement a word to a transmission specialist and maybe an internal line pressure test my show up a pump problem.
Mark (mhpautos)
Saturday, December 29th, 2007 AT 4:31 PM