Andrew, I've seen and been apart of many G50 to 930 conversions over the years and in my opinion, the G50 is a great match for your requirements. What did Porsche do? In 1989 they put a hydraulic G50/50!
Yes the G50 type gearbox is longer than the 930 4-speed but don't worry, it's installation can be done without hacking up your car, graphing in a new torsion tube or having to reposition your engine. Just think of those spring mechanisms you will be updating.
A smart way to achieve this is to remove the proper amount of material from the bell housing and input shaft with machine operations thus creating what the industry refers to as a "short bell housing" transaxle. Then you can run a variety of readily available lower profile, lighter wight Sachs clutch covers and discs. Chris at TurboKraft is the guy who could right a book about this...then a few more chapters on correcting the other ways.
Going the short bell housing route will make it bolt in. Hydraulic pedal assembly parts, line, and a 5-speed shifter (WEVO version awesome) directly from a 86- 911. Then an adapter for the shift rod and trans mount...thats about it.
Were it will add up is what goes into the box like LSD or other gears. If your pumping 500+tq then the gear oil cooler and turbo side covers reenforcement become required. The G50s from the 911 Carrera has killer gear ratios for these turbos. With the lighter weight flywheel / clutch it's one of the best upgrades you can do IMO.
Just sold a 930 and G50 that had a converted torsion to 89 spec. In that trim no short bell housing was needed. Was thankful to have Chris's help with this.
