I know this is old, but I thought I would update it anyway... :crazy:
First of all, there isn't a "performance" shift kit on the market for the CD4E. Also bear in mind that the CD4E is limited to 200 ft lbs of tq. anything beyond this will shorten the life of the tranny. There really hasn't been anyone, other than russel, that has pushed this envelope that I know of.
As we all know, when you upgrade engine performance you should upgrade tranny performance! Well. you Cougar guys are about has high up as they get, next to the Escape and well... there really isn't a whole lot of difference there either.
The only place that I have found that you can pick up performance, when using a CD4E, is using Redline MTL fluid. Yeah, I know! You have heard about that being used in the MTX-75. But the reason being, is that it has a higher rate of friction modifier in it. What that means is more grip on the clutch packs in the tranny. The drawback, a whole lot more wear!! And I mean I WHOLE LOT!!! Percentages? I have no idea! but use just a little common sense and you will get the picture.
The shift kit that Russell spoke of is a shift kit made by TransGo. It is more of a reliability style of performance kit than a Street/Strip performance kit. Plus, it was designed for most older model CD4E's. The only real problems the more recent versions of the CD4E has is the TC shutter and that is found mostly in the Escape and Tribute. That does not mean that your TC bypass valve will not wear out, as most do and cause most of the problems that we see, but...the harder you run it the more you open yourself up to failure.
This last statement holds true for anything, be it a CD4E or a MTX-75. Only the MTX-75 is able to handle more abuse than a CD4E.
Just sharing the facts.