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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 |
![Early Bronco Manual Transmissions](graphics/00000001/3/manual-transmission-category.webp)
9 Items
![3-speed Manual Transmission Rebuild Kit, Fits All 66-77 Bronco](graphics/00000001/whcdn/images/uploads/1492_13708_popup_384x384.jpg)
![Early Bronco Tremec TR4050 5-speed Swap Kit, SBF, Dana 20](graphics/00000001/pio-resized/601/7259NET_384x384.jpg)
![LUK V8 11 Inch Clutch Kit, 164T, 289/302/351W V8, 66-77 Bronco](graphics/00000001/whcdn/images/uploads/1401_516_popup_384x384.jpg)
![Dual Friction Centerforce Deluxe Clutch Kit, 164T, 289/302/351W](graphics/00000001/whcdn/images/uploads/5069_1798_popup_384x384.jpg)
![Trail Edition Gear Banger NP435 Shifter Complete Kit, 66-77 Bronco](graphics/00000001/pio-resized/601/8301NET_384x384.jpg)
![NP435 4-speed Manual Transmission Deluxe Rebuild Kit](graphics/00000001/whcdn/images/uploads/1452_863_popup_384x384.jpg)
![ZF 4WD 5-Speed to Dana 20 Adapter, 66-77 Bronco](graphics/00000001/whcdn/images/uploads/1486_12495_popup_384x384.jpg)
![NV3550 Transmission Adapter Kit (No Trans), 66-77 Bronco](graphics/00000001/pio-resized/601/7207_384x384.jpg)
![Early Bronco AX15 5-speed Manual Transmission Kit with New Transmission](graphics/00000001/whcdn/images/uploads/17808_13952_popup_384x384.jpg)