SD Birds in Registry:
(may not be representative since not all in there)
1973 THM400 with AC - 86
1973 THM400 w/out AC - 35
1973 Manual with AC - 01
1973 Manual w/out AC - 43
1974 Manual with AC - 04
1974 Manual w/out AC - 63
1974 THM400 w/out AC - 80
1974 THM400 with AC - 179
I'd say the SD was not a high RPM engine like the RA IV is why they had AC available.
The RA IV would have gears like 3.90 or 4.33, while the SD had a 3.08 or 3.42 gear.
__________________
John Wallace - johnta1
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