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I just checked the truck I will be restoring. It has the low speed rear end. You can cheat by pulling out the speedodometer gear in the drive shaft and check the #s. I also have two others with the high speed in them. Since I will "split the pumpkin" anyway, how bad of a job is it to change out the parts to make the restore truck a high speed? I have a 32 rear end and a 30/31 rear for parts. PS. I have to laugh when the term high speed comes to play. Should be slow and slower speed when it comes to AAs.
Thanks, Alan

The speedometer gear may not tell you which gears are actually in the axle. Someone could have put different gears in an axle without changing the speedometer gear over the past 70+ years.

The '32 axle will not fit an AA. I don't think that the gears will fit either.

Other than heavy greasy parts, the change over is no problem. If the donor axle has good axle shafts, then the complete internal assembly can be transplanted in your axle.

Yes, high speed gears just means not as slow as the low speed gears!