I posted this question on another forum. Neil, thanks for your response. In the STAR, there was na artiucle about a 400E; the owner changed out the stock differential for an old 450Se 3:07 one. He reports a major increase in acceleration. My question; how much to do this, parts and labor? I thought perhaps a 3:07 differential from a 300E might be the easiest. I am not a DIYer, and would have to pay to have this done.

Any help will be appreciated.
Tom