ok so after putting all the numbers together I was surprised to learn how close the M20 and M21 are. I do the short story...so we know 1st gear is different from 2.56 vs 2.20 BUT...the astonishing part is the shift recovery from 1-2 = SAME. The shift recovery from 2-3 = SAME. Now the shift recovery from 3-4 in the M21 is same as 1-2, 2-3, while the 3-4 shift in the M20 is a little bit larger step at .675 (m20) vs the .781 for the M21.
Now all of this is just numbers, NOTE with the M21 the recovery may be the same BUT you will be going abut 6-9 MPH faster as 1st gear has longer legs. Looks like it will be the M21 (have complete) and the 3.73 gear (have and has been ran in THIS 10 bolt before). While this combo puts me cruising @ 60 mph @ 2650 ish RPM I don't expect to be doing any cross country trips anyway (in this configuration)
Again all of this comes from MY previous experience of my 400, M21, 3.73 combo that was NOT the FUN driver I had hoped. I believe the issue then was the 400 with it's RAIV cam and STUFF...really did not turn ON till 3200 rpm. Anybody who has had one will understand the ON part because it's like a SWITCH turning on the POWER and then pull up to the 6400 shift point. (numbers indicate about 425 max hp and 425 ish torque around 4000rpm) My 455 current build SHOULD be closer to 425 torque @ 2000 rpm and 500 from 3000-5000 rpm so a DIFFERENT driving experience for sure?
Given the dramatic difference in builds....anybody else been down this road
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