From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Breakdown of the component weights of a Cadillac Gear Box and comparison with a Spectre box.
| Identifier | ExFiles\Box 125\1\ scan0222 | |
| Date | 18th March 1935 | |
| -5- Ha/FJH.{Fred J. Hardy - Chief Dev. Engineer}4/KW.18.3.35. Weight of the Cadillac Gear Box. lbs. ozs. Weight of shell without clutch housing and assuming 5 lbs. for feet as on SpectreCodename for Phantom III box. 30 8 Front cover 2 11 Rear cover 7 6 Top cover 7 5 Gear lever with housing 5 13 Selectors 3 1 Synchromesh operating stirrups 4 2 1st motion shaft complete with race, etc. 9 1 3rd motion shaft complete with gears, races, S.M. cones etc. 28 9 Side shaft with races 18 6 Reverse pinion with shaft 2 7 Total weight of Cadillac box in a form comparable with SpectreCodename for Phantom III 120 lbs. Total weight of SpectreCodename for Phantom III box including one more synchromeshed ratio, servo and servo drive. 140 lbs. | ||