4 or 5-speed? And wich one??

[NO_H2O]

You can NOT launch a 901/914 trans. off the line very hard or it WILL break. 1st gear on a 901 is in the nose cone (supported on 1 end with a bearing and the other end is supported by a bushing in the nose cone. 2nd-5th are in the main case (supported on both ends of the shaft with bearings). You can give it all the hell you want to after you are rolling or in 2nd gear. Just dont hole shot it. The 915 has 1st-4th in the main case and 5th in the nose cone. The 930 didn't realy need a 5 speed as it had plenty of power to get thru the gears. After the G50 was introduced it was put in the turo cars and faired very well.