M21 transmition 660 case vs 661

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crash · #1 12-20-2004, 07:35 AM

He just hasn't seen enough cases, I have over 20 examples of 1970 model year 660 cases and they all have drain plugs with A or B ratio codes.
The A,B,C, ratio code didn't start until end of Oct. 1968 so early 1969 model year Muncie's didn't get stamped with a ratio code...Hope this helps...Crash

P.J. · #2 12-21-2004, 03:26 AM

Thanks Crash
experience experience,experience. 34 years later this information is important more so now than when we were blowing them up. Then it did not matter much,pic taken
at cayuga drag strip 1966 with the 55 blue beast.

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