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#5
12-20-2004, 07:35 AM
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Re: M21 transmition 660 case vs 661
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 
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