Guest Posted April 11, 2001 Share Posted April 11, 2001 I have a book indicating the Cast Number and Manufacture date of Powerglide Transmissions and Torque Converters, but what does GM1 mean? I have two powerglides. The other has GM20? GM 1 and GM 20 appears under the Case Numbers. Link to comment Share on other sites More sharing options...
Coley Posted April 15, 2001 Share Posted April 15, 2001 That number shows up on P/glide adapters also and I don't know that it means much except to the people casting parts. The other cast and stamped part numbers will tell you what you have. Link to comment Share on other sites More sharing options...
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