Quote:
Originally Posted by Half-Inch Stud
Notice the M21 says HD...TH400 output shaft (and 1.00" countershaft).
What were the original colors?
Leather Seats sound nice & rare...condition probably cracked dry and need reskinned.
|
the '70 M21 Muncies used in Pontiac Abodys both used the small output shaft. Big output shaft Muncies had to wait til '71 Pontiac models arrived.
The '70 M21 coded DL was used in 3.90 & 4.33 axle applications.
'70 M21 coded DP was used in 3.31 & 3.55 axle 455 GTO applications.
The difference in these two M21's came down to different tooth count speedo drive gears for each transmission.
Leather seat upholstery was not factory optional in '70 GT0's. Leather seat upholstery was avail in few colors for '69 & 70 GrandPrixs.