Hi i'm considering a transmission upgrade soon. currently have auto+ cooler.Now i know its down to personol preferance but should i go for a fast road auto built at ztech or a manwell conversion which would be more reliable in the long run if i was going for big BHP. plus performance wise there isnt much difference is there.also people have had problems with manuals syncro (etc) unless manual box is from 95/6 300zx. personolly might stick with auto save you having to change gears all time all advice appreciated cheers.

manual conversions are ok but when purchasing 2nd hand gearboxs you never know what your going to get,possible syncro wear crunching gears,fast road autoboxes are very good and i think they will happily run 450-500 hp not a problem MAC1 on here has changed from auto-manual and the brand new manual gearbox blew up so as for reliablilty its hard to say,but a brand new recon fast road would be ideal IMO

manuals seem to handle the power better, with less transmission loss, but a lot of cash for a good clutch. It will depend on what bhp you are goingto run at