ZC final drive in SI tranny?

[RedLineZO6]

How is such a thing done? I just read in some other thread that a combination like that would be better for acceleration than either the SI or ZC trannies stock. What all would I need to do that? How long would it take? and how do you put in an lsd?

[TheSilentChamber]

dont know about that, but I know people put dx 5th gear in Si trannys to save gas while at highway speed because the Si is geared lower.

[RedLineZO6]

oh and also... I'm running 195/55 R15s... Are those larger or smaller than stock?

[mellowboy]

Search man. Its one of the most things talked about here in this forum. SI final drive into the zc trans or you can do it the other way around.

The Si transmission is the best choice available. Both the Si and DX transmission bolts right up and keeps the install simple. The DX transmission will sacrifice performance for better fuel mileage and lower freeway rpms. The ZC tranmission has a close ratio 1-5th gear, but a long final drive, making the best transmission still the US Si. For the ultimate acceleration make a Si/ZC hybrid transmission, by taking the Si final drive and put it in the ZC transmission. Or you can do it the other way around, ZC 1-5 in a Si transmission case. Either way, expect 80mph to turn 4300 rpms. However, the ZC transmission requires you to use ZC or 90-91 Integra axles, and a ZC or 86-89 Integra intermediate shaft. Because these axles are equal length, many users report a reduction in torque steer.

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