DeWayne, Out of the 187,285 Firebirds (all models) produced during the 1978 model year, 153,147 came with UPC code C60 air conditioning or approx 81.8%. Theoretically if you take 18.2% evenly for each model, the number of 1978 Trans Ams produced without air would have been approx 16,988 units. But since Pontiac production records only show totals per car series and not models within those series there is no way to know for sure the exact number.
Hope this helps
John
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