How strong is each gear on the MT75 4x4? I know 3rd gear starts giving problems around 350 bhp, and sometimes 2nd gear also gives problems. But how strong are 4th and 5th gear? And would an MT75 with semi-straight cut 1st, 2nd and 3rd gear and standard 4th and 5th be OK for a 400 or maybe 450 bhp car? As the downside of having all gears semi-straight cut is the annoying noise on long trips on the motorway. And would it be possible to mix with standard gears and semi-straight cut?