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Early Bronco Manual Transmissions
Early Bronco Manual Transmission Options
These days there are many options for manual transmissions in your early Bronco. Originally, a three-speed column shifted transmission was the only stock transmission option for 66-72 Ford Broncos and the only manual transmission option in any 66-77 Ford Bronco. There were various versions of the manual three speed. They were all "top loaded" type transmissions. They are commonly referred to as RAT, RAN or HEF. Today, many of these transmissions have been swapped out for more capable 4-speed and 5-speed manual transmissions. The most popular early Bronco 5-speed manual transmission swap today is the AX15 due to its pricing, availability and relatively simple installation process. <| Transmission Gear Ratios | |||||
| 1st | 2nd | 3nd | 4th | 5th | |
| RAT 3-speed (Stock) | 3.41 | 1.86 | 1.00 | ||
| RAN 3 speed (Stock) | 2.99 | 1.75 | 1.00 | ||
| NP435 4-speed Transmission | 6.69 | 3.34 | 1.79 | 1.00 | |
| T18 4-speed Transmission | 6.32 | 3.09 | 1.69 | 1.00 | |
| AX15 5-speed Transmission | 3.83 | 2.33 | 1.44 | 1.00 | .79 |
| NV4500 5-speed Transmission | 5.61 | 3.04 | 1.67 | 1.00 | .73 |
| NV 3550 5-speed Transmission | 4.01 | 2.32 | 1.40 | 1.00 | .78 |
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Frequently Asked Questions
Are WILD HORSES 4x4 parts compatible with my 66–77 Ford Bronco?
Yes. WILD HORSES 4x4 carries every part you need to completely build or restore your 1966–77 Ford Bronco. Each component is carefully tested for fitment and quality to ensure proper compatibility across all early Bronco models.
Does WILD HORSES 4x4 specialize in Bronco restorations?
Absolutely. We specialize in full Bronco restorations and upgrades, offering premium-quality parts, assemblies, and technical support to help you build or restore your classic Ford Bronco with confidence.
What makes WILD HORSES 4x4 the Bronco off-road experts?
Our team lives and breathes Broncos. With decades of experience in early Bronco restoration, customization, and trail performance, WILD HORSES 4x4 is recognized as the Bronco off-road authority—trusted by enthusiasts across the country.
Can I return a Bronco part if it doesn’t fit or I change my mind?
Yes. If your part doesn’t fit or you need to make a return, we make the process simple. Returns are accepted within 30 days when items are in their original condition. Please review our complete policy on our Returned Merchandise & Refund Policy.
Does WILD HORSES 4x4 offer technical support for installations?
Yes. Our in-house tech team provides expert installation and troubleshooting support for every product we sell. Whether you’re working on a full restoration or a weekend upgrade, we’re here to help get your Bronco back on the road or trail fast.