"Upgraded" how? A BB motorhome, police or taxi trans is basically just a HD unit using the same 4-pinion planetary as any production trans, so that might be considered an "upgrade" from 3-pinion units.
The 383-2 unit circled above would have 3-pinion planetaries front and rear.
Yes, "upgraded" meaning 4-pinions... Which implies that the only difference in police or taxi units was the pinion count (?)
