| Description | Date | Identifier | |
| Authorisation sheet number 6 for 'India', regarding two small covers for the gearbox. | 25th Mar 1929 | Box 6 \ 4 04-page107 | |
| Telegram about issues with a 4-speed gearbox and a proposed new drawing. | 25th Mar 1925 | Box 6 \ 4 04-page108 | |
| Tests conducted on the 'INDIA' gearbox to resolve issues with the 1st speed gear. | 30th Mar 1925 | Box 6 \ 4 04-page109 | |
| Gearbox test investigating issues with the first speed gear. | 30th Mar 1925 | Box 6 \ 4 04-page110 | |
| Delays with the 'India' chassis and testing of front wheel brake parts. | 1st Mar 1925 | Box 6 \ 4 04-page111 | |
| Testing a modification to the 'India' gearbox pinion to prevent it from working out. | 8th Apr 1925 | Box 6 \ 4 04-page112 | |
| Suggestions for the plunger location on 1st and 2nd speed sliders for a 4-speed gearbox. | 17th Apr 1925 | Box 6 \ 4 04-page113 | |
| Bumping rig tests for an 'India' front axle, noting a chassis failure and plans for further pivot testing. | 18th Apr 1925 | Box 6 \ 4 04-page114 | |
| Design of gearbox sliding pinions, comparing spiral keys to splines with modified driving angles. | 19th Apr 1925 | Box 6 \ 4 04-page115 | |
| 2nd speed gear issue in the 'INDIA' gearbox and a proposed modification. | 22th Apr 1925 | Box 6 \ 4 04-page116 | |
| Instruction of experimental shaft splines for 40/50 & India gearboxes. | 22th Apr 1925 | Box 6 \ 4 04-page117 | |
| Secret memo regarding a modification to the splines on the 1st and 2nd speed pinions for the 40/50 & India Gearbox. | 24th Apr 1925 | Box 6 \ 4 04-page118 | |
| Depth of a slot and locking spring strength for a four-speed gearbox. | 30th Apr 1925 | Box 6 \ 4 04-page119 | |
| Confirmation of a phone message regarding India gearboxes, advising not to build them until results from modifications are available. | 5th May 1925 | Box 6 \ 4 04-page120 | |
| Secret memorandum instructing a halt in production for 'India' chassis gearbox parts, pending results of modifications. | 1st Jan 1925 | Box 6 \ 4 04-page121 | |
| Secret memo regarding modifications to four-speed gearboxes for India, discussing issues with 1st and 2nd speed pinions. | 1st Sep 1925 | Box 6 \ 4 04-page122 | |
| Page 2 of a report discussing design suggestions for a shaft and change lever, comparing it to the 40/50 model. | 5th May 1926 | Box 6 \ 4 04-page123 | |
| Modifications to decrease the height of the floorboards for the 20 HP model. | 5th May 1926 | Box 6 \ 4 04-page124 | |
| Secret internal memo discussing modifications to a 4-speed gearbox for India to avoid excessive scrap parts. | 1st May 1925 | Box 6 \ 4 04-page125 | |
| The failure of a first speed gear test for the 'India' gearbox. | 13th May 1925 | Box 6 \ 4 04-page126 | |
| Post Office Telegram with handwritten instructions regarding adjustments to splines and a servo drive. | 14th May 1925 | Box 6 \ 4 04-page127 | |
| On a Post Office Telegraph form regarding modifications to a worm wheel, servo, and braking system. | 14th May 1925 | Box 6 \ 4 04-page128 | |
| Modification to the 'India' 4-speed gearbox to improve oiling of the worm and worm wheel. | 16th May 1925 | Box 6 \ 4 04-page129 | |
| Improvements to increase the wearing capacity of the India gearbox servo drive. | 16th May 1925 | Box 6 \ 4 04-page130 | |
| 'creeping' issue in a gearbox and proposing further tests on spline and serration angles. | 9th May 1928 | Box 6 \ 4 04-page131 | |
| Instructions regarding the modification and fit of parallel and taper bore pinion serrations. | 19th May 1925 | Box 6 \ 4 04-page132 | |
| The design and supply of an oil thrower for a 4-speed gearbox. | 19th May 1925 | Box 6 \ 4 04-page133 | |
| Secret memo discussing experiments to fix the 'creeping gears' issue in the India 4-speed gearbox, focusing on spline angle and parallelism. | 21th May 1925 | Box 6 \ 4 04-page134 | |
| Gear bore fitment and a proposed lubrication system for a servo drive wormwheel. | 22th May 1925 | Box 6 \ 4 04-page135 | |
| Modifications to the 'India' gearbox, focusing on the angle of splines and gear alterations. | 22th May 1925 | Box 6 \ 4 04-page136 | |
| Comparative diagram illustrating two designs of splined pinions. | 22th May 1930 | Box 6 \ 4 04-page137 | |
| Improved lubrication scheme for a 4-speed gearbox servo. | 28th May 1925 | Box 6 \ 4 04-page138 | |
| Improved lubrication scheme for the 'India' four-speed gearbox and servo. | 3rd Jun 1925 | Box 6 \ 4 04-page139 | |
| Secret report on experiments with the 'INDIA' gearbox, focusing on oil supply to the worm wheel and spline modifications. | 12th Jun 1925 | Box 6 \ 4 04-page140 | |
| Modifications and testing of the 'Inma' gearbox. | 1st Jun 1925 | Box 6 \ 4 04-page141 | |
| Modifications to the 'INDIA' gear box regarding taper serrations and keyways. | 15th Jun 1925 | Box 6 \ 4 04-page142 | |
| Requesting a modification to a servo drive worm wheel for a 4-speed gearbox to reduce its weight. | 1st Jun 1925 | Box 6 \ 4 04-page143 | |
| Secret memo regarding a suggested improvement to the 4-speed gearbox, specifically the clearance for the gear change lever. | 1st Jun 1925 | Box 6 \ 4 04-page144 | |
| Secret memo regarding the return of vehicle 9-G-111 for an 'India' gearbox inspection. | 30th Jun 1925 | Box 6 \ 4 04-page145 | |
| Part replacements and material orders for the 2nd motion shaft on the 20-HP chassis for India. | 2nd Jul 1925 | Box 6 \ 4 04-page146 | |
| List of drawings and part modifications for the 20-HP Chassis (India) gearbox and actuating gear. | 2nd Jul 1925 | Box 6 \ 4 04-page147 | |
| List of drawings for the Gear Box Undersheet for the 20-HP India Chassis. | 3rd Jul 1925 | Box 6 \ 4 04-page148 | |
| Parts list and order request for various components for Series 'P' and 'G' vehicles. | 24th Jul 1925 | Box 6 \ 4 04-page149 | |
| Secret memo from 'R' to 'CJ' detailing a 60-mile test run of a modified India chassis. | 24th Jul 1925 | Box 6 \ 4 04-page150 | |
| Testing of specially ground continuous gears for a four-speed gearbox to eliminate humming. | 6th Aug 1925 | Box 6 \ 4 04-page151 | |
| The performance of a gearbox and clutch, noting its good handling is up to standard. | 25th Aug 1925 | Box 6 \ 4 04-page152 | |
| Testing the ventilation of a 20 HP gearbox by drilling a hole to investigate oil leaks. | 1st Oct 1935 | Box 6 \ 4 04-page153 | |
| From 'R' to 'CJ' discussing the shift in preference from 3-speed to 4-speed gearboxes for the 20 HP and 40/50 HP models. | 19th Oct 1925 | Box 6 \ 4 04-page154 | |
| Frame stiffness, the testing of a new tie-rod, and gearbox design considerations between the 20 HP and 40/50 chassis. | 1st Nov 1925 | Box 6 \ 4 04-page155 | |
| Investigation into a stiff gear lever on a 20 HP chassis, considering gearbox oil viscosity. | 25th Nov 1925 | Box 6 \ 4 04-page156 | |
| Modifications to the India gearbox and floorboard for increased clearance. | 14th Dec 1925 | Box 6 \ 4 04-page157 | |
| Following up on a telegram regarding the essentiality of a lubricator for the India Gearbox servo drive. | 14th Dec 1925 | Box 6 \ 4 04-page158 | |
| Modifications and clearances for the India market gearbox and floorboards. | 27th Jan 1926 | Box 6 \ 4 04-page159 | |
| Weight comparison document for components between models G.11 and G.111. | 1st Feb 1926 | Box 6 \ 4 04-page160 | |
| Modifications to the India Gearbox to allow for the lowering of floor-boards. | 2nd Mar 1936 | Box 6 \ 4 04-page161 | |
| Solution for hot air and gas leaks through the floorboards via the gearbox gate mechanism. | 24th Mar 1926 | Box 6 \ 4 04-page162 | |
| Proposing a revised scheme to fix gas leaks through India floorboards to avoid issues with dismantling the gearbox. | 25th Mar 1926 | Box 6 \ 4 04-page163 | |
| Sluggishness issue with the India change speed lever and requesting tests for the new EAC.7 gearbox. | 8th Apr 1926 | Box 6 \ 4 04-page164 | |
| The chassis gear ratios, engine revs, and dynamo revs for the Goshawk II and III models. | 1st May 1926 | Box 6 \ 4 04-page165 | |
| Graph of road speed versus engine RPM for Goshawk II & III gear ratios. | 15th May 1926 | Box 6 \ 4 04-page166 | |
| Confirming a telegram and discussing modifications to the servo braking system for a car in India. | 15th May 1926 | Box 6 \ 4 04-page167 | |
| Solutions for issues with gears, worms, splines, and damping segments. | 15th May 1926 | Box 6 \ 4 04-page168 | |
| Friction dampers and front spring design, discussing material choices and camber issues. | 15th May 1926 | Box 6 \ 4 04-page169 | |
| Potential improvements to front wheel braking, the servo, and front spring stiffness. | 3rd Nov 1926 | Box 6 \ 4 04-page170 | |
| Experiments with lower gear ratios for the 20 HP car due to heavier coachwork demands. | 3rd Nov 1926 | Box 6 \ 4 04-page171 | |
| Standardisation document for the incorporation of 'B' type shear-levers with 'D' type steering. | 22th Oct 1926 | Box 6 \ 4 04-page172 | |
| Provision of high gear ratios for 40/50 and 20 HP cars. | 16th Nov 1926 | Box 6 \ 4 04-page173 | |
| Wording correction on a standardisation sheet for the 20 HP chassis side lever mechanism. | 22th Nov 1926 | Box 6 \ 4 04-page174 | |
| Query about the position of experimental lower gears for the 20 HP model, with handwritten notes on gear ratios. | 13th Jan 1927 | Box 6 \ 4 04-page175 | |
| Standardising the gearbox oil level and procedure for checking it to minimise leaks. | 16th Feb 1927 | Box 6 \ 4 04-page176 | |
| Modifying the gear box tower cover on a 20 HP chassis to prevent oil leaks. | 25th May 1927 | Box 6 \ 4 04-page177 | |
| Standardization of the speedometer drive for Phantom and India models. | 1st Aug 1927 | Box 6 \ 4 04-page178 | |
| The 'India 3' (Next 20 HP) trial car for France, detailing work on the frame, crankshaft, and engine components. | 1st Sep 1927 | Box 6 \ 4 04-page179 | |
| Speedometer drive issue on chassis GSK-76. | 1st Sep 1927 | Box 6 \ 4 04-page180 | |
| Vibration in the change speed lever, recommending a fix with a small rubber pellet. | 1st Dec 1927 | Box 6 \ 4 04-page181 | |
| Investigation into change gear lever vibration and audible noise on the 20 HP model. | 3rd Dec 1927 | Box 6 \ 4 04-page182 | |
| Blueprint diagram illustrating a cross-section of a component assembly with a rubber block. | 1st Jan 1923 | Box 6 \ 4 04-page183 | |
| Inquiry regarding the procedure for removing the gearbox without taking down the engine on model EAC.10. | 1st Jan 1923 | Box 6 \ 4 04-page184 | |
| The practice of removing gearboxes from 20HP chassis without removing the engine. | 16th Jan 1928 | Box 6 \ 4 04-page185 | |
| Accessibility and removal of gearboxes from 20 HP chassis. | 23th Jan 1928 | Box 6 \ 4 04-page186 | |
| Modification to the tubular cross member to allow for gearbox removal without taking out the whole unit. | 6th Mar 1928 | Box 6 \ 4 04-page187 | |
| Proposals for improving the gas tightness of the 20 HP gear quadrant. | 18th Jun 1928 | Box 6 \ 4 04-page188 | |
| Speedometer gear ratios, noting a 3% fast reading on Mr. Royce's car and proposing an alteration for two India chassis. | 5th Aug 1928 | Box 6 \ 4 04-page189 | |
| Request for modifications to use a 20 HP gearbox and motor to drive a shock absorber test rig. | 3rd Sep 1928 | Box 6 \ 4 04-page190 | |
| Optimal gearbox and back axle ratios for cars. | 21th Sep 1928 | Box 6 \ 4 04-page191 | |
| Recommendation to keep the non-standard 10 x 47 gears in stock for future review rather than scrapping them. | 10th Oct 1928 | Box 6 \ 4 04-page192 | |
| Letter discussing the need for increased acceleration and considering freewheel technology. | 24th Oct 1928 | Box 6 \ 4 04-page193 | |
| Gearbox design, focusing on alternatives for achieving a 3rd speed using an epicyclic gear unit. | 24th Oct 1928 | Box 6 \ 4 04-page194 | |
| Discussion comparing different gearbox arrangements, specifically epicyclic versus double helical gears. | 25th Oct 1928 | Box 6 \ 4 04-page195 | |
| Instruction regarding the calibration of speedometers for India 1V cars. | 25th Oct 1928 | Box 6 \ 4 04-page196 | |
| 30-hour endurance test for the strength of gears in a 20 HP gearbox. | 1st Nov 1928 | Box 6 \ 4 04-page197 | |
| Arranging trials of a freewheel with a cancelling clutch and an epicyclic third gear. | 20th Nov 1928 | Box 6 \ 4 04-page198 | |
| Order for a custom-calibrated 20 HP speedometer with a cream dial. | 12th Dec 1928 | Box 6 \ 4 04-page199 | |
| Design fault in the 'SS' gearbox, specifically the difficulty in engaging reverse gear. | 17th Dec 1928 | Box 6 \ 4 04-page200 | |
| Standardisation report for a modified gearbox casing to reduce front floorboard height. | 30th May 1928 | Box 6 \ 4 04-page201 | |
| Record detailing the chassis number, test date, and costs for fitting a new part. | 6th Apr 1929 | Box 6 \ 4 04-page202 | |
| Design of SS and 20 HP gearboxes, comparing different 3rd speed schemes for silence and ease of change. | 3rd Mar 1929 | Box 6 \ 4 04-page203 | |
| American schemes and the performance of an 'SS' vehicle after 14,000 miles. | 7th Mar 1929 | Box 6 \ 4 04-page204 | |
| Change gear problems, including epicyclic gears and freewheel sideshafts. | 7th Mar 1929 | Box 6 \ 4 04-page205 | |
| Scheme for a freewheel in the sideshaft of a 20 HP gearbox. | 20th Mar 1929 | Box 6 \ 4 04-page206 | |
| | | | |
