I have a 67 with a 4 speed in it. The tranny is in an M 10 and it is great for cruising on the freeway and stuff but i would like to be a little quicker off the line. Would putting an M21 or M22 rock crusher compromise my ability to cruise on the free way or do they have wide open 4 gears. I dont mind shifting around town but i dont want to give up my ability to drive my car far without redlining. Also if this is applicable does anybody know where i could find a nice M21 or M22 for a decent price. Thanks for your time sincerly Lance. Oh by the way i have a 3.55 rear end on it.
