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4R70W 4 speed automatic with overdrive

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Tech article by Tim Bowsher (Broncobowsher)

Selecting a new transmission.
It started with when I got the latest Bronco. I didn't want the old 3 speed anymore. I have heard about the NP435, so I got one. I ran along happily with 33's, 4.10's, and the NP435 behind the warmed up 351. It worked ok. The granny was great, but the rest of it was still just a 3 speed. Actually a littl... Click here for full Tech Article
 
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