Best fluid for stock model a rear axle?

600W that all the vendor's sell. You're going to get a "zillion" different answers now that you've opened the "door". :D:eek::cool:Paul in CT
 
Just about any gear oil regardless of API rating will work in a rear axle for a model A. The SAE viscosity should match the appropriate recommendations for the time of year the car is most often operated in. SAE 85/140 is a safe bet for year round operations.
 
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