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).
Comparison table of gearbox backlash tests for various vehicle models and configurations.
| Identifier | ExFiles\Box 91\4\ scan0016 | |
| Date | 27th May 1935 guessed | |
| GEAR BOX BACKLASH TESTS AMOUNT OF SLACK MEASURED AT 1.875 RADIUS TABLE DATA: COLUMN HEADERS: - 40/50, 40 UK - VULTURE, J 3 SYNCHRO, 2ND SPEED - SPECTRECodename for Phantom III 1.5:1, ALL HELICAL, I H S - SPECTRECodename for Phantom III 2.5:1 - SPECTRECodename for Phantom III 3.5:1 - BUICK ROW DATA (from left to right columns): CLUTCH SPLINES: .005, .007, .027, .012, .006, .0035 REAR AXLE PINION: .017, .080, .210, .110, .070, .027 GEARBOX (MEASURED AT 3RD MOTION SHAFT): - TOP GEAR: .009, .023, .015, .012, .022, .025 - 3RD GEAR: .036, .013, .041, .073, .073, - - 2ND GEAR: .008, .034, .023, .025, .044, .029 - 1ST GEAR: .009, , .010, , , .032 | ||