The one part of the oval project that has given me the the most challenges is the 915 gearbox conversion. Most people that opt to go down the Porsche 5 speed route use the much easier to fit 901 gearbox from the Porsche 914 / 912. Whilst not as strong as the later 915 box it shares the VW mountings, uses a cable pull style clutch and is much simpler to install. I opted to go with the 915 as the 901 was not suitable for the power of the big Type 4 that I had planned to hook up to it, plus I did not like the dogleg shift pattern of the 901.