Re: M20 or M21
Gary,
For both '66 and '67 model years when ordering the L79 option you could get the M20 wide ratio transmission with either the 3.36 open rear as standard equipment or 3.36 posi as an option. When ordering the L79 option with the M21 close ratio transmission, the 3.70 open diff was standard with the 3.70 posi available as an option. When the M20 was ordered you could, also, opt for a 3.55 open or posi rear. When the M21 was ordered you could opt for the 4.11 open or posi rear.
You could not get the 3.36 or 3.55 gearing with the M21 nor could you get the 3.70 or 4.11 with the M20.
Gary,
For both '66 and '67 model years when ordering the L79 option you could get the M20 wide ratio transmission with either the 3.36 open rear as standard equipment or 3.36 posi as an option. When ordering the L79 option with the M21 close ratio transmission, the 3.70 open diff was standard with the 3.70 posi available as an option. When the M20 was ordered you could, also, opt for a 3.55 open or posi rear. When the M21 was ordered you could opt for the 4.11 open or posi rear.
You could not get the 3.36 or 3.55 gearing with the M21 nor could you get the 3.70 or 4.11 with the M20.
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