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For those who care about K-series Honda engines, the Accord 5 speed is essentially the same case as the TSX 6 speed, just with a spacer in place of the 6th gear. The gears from any K24A or K24Z-mated transmission are interchangeable, but I believe the K24W gearboxes are different.
2003-2007 Accord:
1st - 3.266
2nd - 1.769
3rd - 1.147
4th - 0.872
5th - 0.659
Final drive - 4.389
2003 Accord (CL7/CL9) UK spec:
1st - 3.266
2nd - 1.769
3rd - 1.121
4th - 0.972
5th - 0.780
Final drive - 4.105
2004-2008 Acura TSX:
1st - 3.266
2nd - 1.88
3rd - 1.355
4th - 1.028
5th - 0.825
6th - 0.659
Final drive - 4.764
Casing is made of magnesium for weight savings and reduced noise.
2012-2015 Civic Si:
1st - 3.266
2nd - 2.040
3rd - 1.429
4th - 1.073
5th - 0.830
6th - 0.647
Final drive - 4.764
Has a limited slip differential.
The ideal Frankenstein gearbox is thus an 04-08 TSX gearbox with a UK Accord final drive and a 2012 Civic Si 6th gear - assuming you don't have custom gears made. All Si's come with factory LSDs - probably not something most ecomodders would want but worth noting.
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