I neglected to share my transmission upgrade/downgrade - depends on your perspective . I was previously running a GForce T5 with straight cut gears . Whine was cool for one year and I was over it . Loved being able to slam gears and not worrying about shock loading the trans . Really liked all the shifter options with the T5.
i know some guys don’t like the heavy/ notchy shifter , but I like the feel .
I didn’t want to replace the G Force with the OEM NWC T5 . Didn’t want a 71B or 71C and parts are getting scarce . CD009 meant more weight , less room and more retro fitting .
What I did was found a way to run a new Tremec T5 world class . I had to source a tailshaft from a WC T5 that put the shifter in the right position . NWC output shaft is only 1.3” and a WC is 1.5” so you can’t use the NWC tailshaft unless you weld build it and machine it out and hope it gets done right .
I got Modern Driveline to help me out doing the R&D . I sourced a WC tailshaft from a Commodore out of Australia . Shifter location is exactly the same . Modern Driveline machined the input shaft for proper length and pilot bearing size . I run a Ford clutch and I run an internal slave unit .
Modern Driveline installed the tailshaft on their new trans and made sure it worked good . That put a new detent plate in for the shifter and since I bought the trans new they honored their 2 year warranty !
Trans is very quiet and so far all is good . It’s rated at 330 ft pounds on a 3300 pound car , so it’s plenty strong enough . Best part is the trans bolts in just like the Nissan one . Yes you also need to modify the DS