Since Inline Pro's scienced out how to stuff R200 diffs into S2000s, does anyone know if they or another shop has also made a conversion that fits a trans from one of the following cars to the S2000? I'm on my second trans (first failed a bearing likely due to torque load); not sure if it's having a similar bearing failure in progress -- by the way, I don't do any powershifting, no launches -- mostly street driving and some autocross.

Nissan 350Z / G35 trans with stock S2000 4.10 ratio.
Decent (not ideal, but not bad) gear spacing for FI. One would think it would have a stronger torque rating than our transmissions. Lots of them in the salvage yards for less than S2K transmissions; probably a decent rebuild cost.


Tremec TKO600 with 2.95:1 first / 0.82:1 5th using 4.77s in rear.
Close gearing to AP2 with 4.10s (not ideal for NA car gear splits but would be OK given FI's wider powerband; at 600 ft lbs, torque rating isn't a concern

Others?
Tremec T56 has too big of a drop into 4th, and 6th becomes useless.
BMW E46 6 speed has too big of a 1-2 drop.
~$11K dog box (just seems extreme for my pocketbook and usage)

Approach
1 - Measure to find what fits best in terms of dimensions (diameter, location of shifter, input shaft length, overall length),gear ratios
2 - Machining adapter plates that locate the trans properly in relation to bellhousing & trans brace (possibly custom trans brace)
3 - Machining the input shaft to fit S2000 clutch disc location (or getting a custom clutch disc that works with the trans's input shaft & ACT PP)
4 - Custom driveshaft
5 - Tweaking of clutch slave cylinder

AP2 + 4.10 ratios, 1 - 6 (net of trans * reduction gear * rear-end ratio)
15.52
10.13
7.34
5.75
4.67
3.78

350Z / G35 with 4.10s, gears 1 - 6
15.54
9.51
6.64
5.21
4.10
3.24

Tremec TKO-600 with 4.77s, gears 1-5 (huge torque rating, wider gear splits)
13.69
9.02
6.11
4.77
3.91

Tremec T56 with 4.77s, gears 1 - 6, (massive drop in gears 4-6; 6th becomes useless)
14.17
9.87
6.82
4.77
3.82
2.96

Has anyone done the dimensional measurements on these transmissions or others? Ideas welcomed.

Thanks,
Stanford

 

TKO's do not like to shift much past 6500. The syncros were not made for it. I suspect you will have similar issues with some of the others. It's definately an issue that needs to be addressed, but it will not be an easy one.