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Early Ford Bronco TRANSMISSION
The early Bronco came from Ford with either a 3 speed manual transmission (66-77) or the C4 3 speed automatic (73-77). One of the most popular transmission conversions has been the NP (New Process) 435.
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Transmission Gear Ratios
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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 |
| 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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AUTOMATIC C4 
AUTOMATIC TO MANUAL 
3 & 4-SPEED TRANSMISSIONS 
NV3550 5-SPEED 
NV4500 5-SPEED 
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