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My biggest problem with going to a 4 speed is the electronic controls... That transmission won't operate w/o the computer, and the computer won't communicate w/ my Engine computer or body control module, so I'd have to swap a bunch of wiring, and add some in, etc.. it's way beyond anything I'd want to do with the van for just a few % gain.
Instead, I'm going to bulid a manual valve body 3 speed with manual lockup control in all gears, *hopefully* LSD. I'm also going to build a turbo 2.0 (420A) DOHC engine to swap in place of the 2.4 that I have now. Turbo + .4 liters less should get me a nice power curve with great mileage, considering the 28mpg I just got on the last tank with no effort at all.
I gotta get my Garage setup for the van on here... I just wanted to wait until I had a few tanks and a solid baseline so it didn't seem so weird that I got over EPA right away w/o trying. (25.66 I think it was)
So what else is OP doing to improve the van? I'd love to see some more on this, since I too have a Caravan and plan on modding it for better mileage.
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