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Greg Brown posted recently in a Rennlist thread that the early design, while klunkier, has better feel in the engagement so you know if you are in the right gear. Apparently an issue racing the newer Borg Warner style tranny engaging the wrong gear is possible with destructive results. Despite this most track cars use a Borg style late model tranny with the G28/55 from a GT highly desirable.
My US 83 has the original 145k mile 5 spd, and its shift with care into second from first, fo get about it down shifting from 3rd to 2nd except slowly with blipping (release the clutch in neutral and blip the throttle to spin up input shaft). I have a rebuilt early tranny I plan to put in it.
My Euro S 85 has 195k on its tranny and its in fair shape, but I plan to put a rebuilt LSD Borg style (as it current has) in it.
Rebuilt I think either is good, my preference is the Borg later model, and big difference is cost. Borg type newer 5 spd transmissions are a good $1000 more than early transmissions, plus two other factors, early transmissions don't last as long and tend to always need a rebuild when purchased used, and early transmissions have some pricey parts like a $600 input bearing that usually needs replacing.
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