Dana 80 Questions

Randy's Ring and Pinion now has 37 spline stock replacements out of the f450 but the lengths they carry are 40" and the 37 5/8th". Now I need to re-measure my axle shafts.
 
Randy's Ring and Pinion now has 37 spline stock replacements out of the f450 but the lengths they carry are 40" and the 37 5/8th". Now I need to re-measure my axle shafts.

Doesn't the F450 use a larger drive flange on its axle shafts?
 
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