Z32 transmissions have been known to be behind some engine setups making serious power and dragged often. However, used they suffer from worn synchros or baulk ring retaining clips that fall off and end up causing the grinding, not the synchros. If you purchase one, I recommend having it gone through.
The NA and TT are identical transmissions minus the speed sensor gears and the bell housing, specially around the starter pad to accommodate the larger flywheel. I have yet to find any information showing they are two completely different transmissions internally.
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* My SR20VET* Does your VTC gear rattle in your S14/15 SR? PM me.
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