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Early Bronco Transmission
The Early Bronco came from the factory with either a 3-speed manual transmission or a Ford C4 3-speed automatic transmission. The automatic transmission was only offered in 73-77 Ford Broncos and did not have an overdrive gear. We offer a variety of parts to rebuild your factory 1966-77 Ford Bronco transmission or upgrade to a modern 4-speed or 5-speed manual transmission or automatic transmission with overdrive.
Common Early Bronco Transmission Gear Ratios
| Transmission Gear Ratios | |||||
| 1st | 2nd | 3nd | 4th | 5th | |
| RAT 3 speed | 3.41 | 1.86 | 1.00 | ||
| RAN 3 speed | 2.99 | 1.75 | 1.00 | ||
| NP 435 | 6.69 | 3.34 | 1.79 | 1.00 | |
| T 18 | 6.32 | 3.09 | 1.69 | 1.00 | |
| C 4 auto | 2.46 | 1.46 | 1.00 | ||
| AX15 5-Speed | 3.83 | 2.33 | 1.44 | 1.00 | .79 |
| NV 4500 | 5.61 | 3.04 | 1.67 | 1.00 | .73 |
| NV 3550 | 4.01 | 2.32 | 1.40 | 1.00 | .78 |
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