Not sure where the '37 Super 8 is listed, but not in this parts book. There's an 8, 138CD for 1937 in this book. The axle ratios look like 4.54 standard, 4.36 or 4.7 special. I'm sure someone more knowledgeable can point you to the correct info.packardinfo.com/xoops/html/downloads/par ... 5-41_PartsList_Group12_RearAxle.pdf
Joe
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