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Thought I'd throw these up here after doing some research. The HCH1 and CR-Z gearboxes have both proven to be almost completely interchangeable with the Insight's. Chances are decent the Fit's gearbox has interchangeable internals but a different, more laterally compact shape. The bolt pattern for the 2015+ Fit and 2016+ Civic are likely different but some gears may be interchangeable with the CR-Z box.
Insight:
1st - 3.462
2nd - 1.750
3rd - 1.096
4th - 0.857
5th - 0.711
Final drive ratio - 3.208
Tire size - 165/65r14 (899 revs/mile)
2003 Civic Hybrid:
1st - 3.462
2nd - 1.870
3rd - 1.241
4th - 0.912
5th - 0.711
Final drive - 3.600
Tire size - 185/70r14 (834 revs/mile)
2007 Fit:
1st - 3.462
2nd - 1.870
3rd - 1.321
4th - 0.970
5th - 0.757
Final drive - 4.294
Tire size - 175/65r14 (879 revs/mile)
2009 Fit:
1st - 3.308
2nd - 1.870
3rd - 1.303
4th - 0.949
5th - 0.727
Final drive - 4.625
Tire size - 175/65r15 (842 revs/mile)
2011 CR-Z:
1st - 3.143
2nd - 1.870
3rd - 1.303
4th - 1.054
5th - 0.854
6th - 0.689
Final drive - 4.29
Tire size - 195/55r16 (825 revs/mile)
2015 Honda Fit: (L15B engine)
1st - 3.462
2nd - 1.870
3rd - 1.235
4th - 0.949
5th - 0.810
6th - 0.727
Final drive - 4.62
Tire size - 185/55r16 (840 revs/mile)
2016 Honda Civic: (L15B engine)
1st - 3.643 (probably higher because the Civic is heavier)
2nd - 2.080
3rd - 1.361
4th - 1.024
5th - 0.830
6th - 0.686
Final drive - 4.105
Tire size - 215/55r16 (797 revs/mile)
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