[JoeG]

There was a test done way back by Royal Pontiac----In this test they used a 3sp manual(similar ratio to M2O) and a M21 close ratio 4sp----the GTO had a 3:90----Larry is right in that it had a kick off the line but did fall below the power band--(now the diference might be a little less with the M2O), --the results were .25sec to.40sec and 1 to 3 mph slower with the three sp. depending how tight you wanted wind the 3sp.------For performance you would normally use a close ratio trans with an axle ratio of 3.90 or above,where the 2.20 low would'nt give enough kick off the line with a 3.55 etc.-----Just some added info------------