Of course I never say "NEVER", but in talking to an old friend of mine who was a line supervisor, the substitution rule was that you could add an upgraded part, but not a downgraded part. So if you ran out of standard sized battery trays, you could substitute the larger tray from a HD battery/big engine car, but not vice versa. With engine fans I would think you could add a clutch fan or fan with more blades if your car was spec'd for less, but you couldn't downgrade to, say a 4 blade no clutch fan in an air conditioned car. It was to be avoided if possible, but it was preferable to stopping the line or pulling cars to the side. In this case, the 772 fan would be an "upgrade", right?
Last edited by tom406; 09-01-2020 at 05:09 AM.
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