Y1 is the original tranny for the first gen B16A motor...LSD is optional but I'd highly recommend it. Here is a site that list the gear ratios and specs... http://www.bseries.net/html/specs/btrannyspecs.php
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 AF Bay Area Crew
Fully Built LSVtec Motor (245.8 whp/164.6 torque)
88 DX Hatch to JDM SiR conversion
Retired SOLD 1/08
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