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NP-435 Four Speed Transmission Conversion

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Tech article by Jon Hanna (Admin)

Following are photos of the popular NP435 4 speed installation. This transmission is a much stronger unit than the original 3 speed found in most early Broncos. 2nd, 3rd and 4th gears are comparable to 1st, 2nd and 3rd gears in the stock 3 speed. However the NP435 has a much lower 1st gear (sometimes called a "granny" or "creeper" gear) which allows for... Click here for full Tech Article
 
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