To add a little fuel to this conversation.. I have a 77 short bellhousing 930 5 spd trans in a 77 930 that does not have a RUF nose cone, and the car has Andial fingerprints on the vintage build.
A 5 speed was built by Ruf early 80s and possibly by Andial even before that . The 4spd was in the 930 chassis for homologation purposes for the 930 project to comply for the production requirements as most reading this know.
I wonder if they got away with a 5spd in any 934 as the Andial partners has long had an affiliation going back then and may predate the RUF 5spd? Just wondering / musing.
First is a dogleg against a spring with reverse in the same place with a gear ratio that gets around 50MPH, the second gear is the old first gear place, with a ratio of around 85MPH, 3rd 120 MPH, 4th around 155 all @ 6800 redline and 5th seems to be close to the stock 4th ratio.
Also a 4spd with a 8:41 R&P is an improvement for our roads with a top speed of around 145 MPH. Sort of like a G50 without the 5th gear. Or just use the stock R&P and regear 3rd and fourth so it gets to around 120 in 3rd and 145 or so in fourth. A g50 is so much work and expense as the alternative and a converted 4spd to a 5spd by RUF is also very costly and rare.