d15b2 transmission

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Any D series cable clutch transmission. I would keep the one you have- it's already pretty good... unless you just want the slightly shorter final drive of the Si transmission.
 
88-91 L3 trannys will bolt up...the 88 has different clutch splines though...the si would be your best choice of a stock tranny....you could however build a close ration tranny like mine...its a 1-2 si/dx(dx and si have same 1-5) and 3-5 zc with the si final....great combo for the n/a engine.
 
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