FYI - I just replaced the original York compressor on a 1980 Spirit with 258 - found a NEW unit locally for only $165 (yes, I am sure it's new). It works smoother and quieter than any York I have ever used before. I figure the modern technology has found it's way to the older unit. I planned to go Sanden, but this was "supposed" to be a low-buck resto for a daily driver. We (my son and I) got a little carried away, but decided to stay cheap on the AC. Glad we did. It's the first nice comment I have ever made about a York compressor. Cliff Danley Jacksonville, Florida