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 much more control when rock crawling.
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 much more control when rock crawling.
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| Comparisons of the stock Bronco 3 speed and NP435 4 speed. |
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| Installation from below. |
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| Shifter hole and cover plate. |
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| Adaptor |
