Last year, after doing a lot of research, I came up with an electric 2 speed fan from a 90 to 95 ford Taurus V6. I picked it up at the local Pick-a-Part for $20.
I had to modify the shroud some what to fit in my 53 1/2ton with a 400 SB, but it works great.
I used a temperature sensor ant heavy duty relay from Summit to control it.
Bear
