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Old 12-21-2021, 01:59 AM
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From Chevelle Stuff website...

1966 Chevelle RPO Production Numbers/MSRP

M20 4-speed wide-range transmission (SS396)
283 or 327 engine
(13680 - 01/07 - L35) 73,022 $105.35
$184.35
$188.30

M21 4-speed close-ratio transmission - available with L79, L34, and L78 engines. 5,012 $105.35
M22 4-speed close-ratio transmission 12


There were none reported in 1967...
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1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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