| Description | Date | Identifier | |
| Proposal to alter the lightening holes on a Phantom III Gearbox component to increase strength and reduce cost. | 16th Nov 1936 | Box 94 \ 2 scan0067 | |
| Instructing a production change to the Phantom III gearbox selector spring to prevent gears coming out on over-run. | 17th Nov 1936 | Box 94 \ 2 scan0068 | |
| Letter to a bearing supplier regarding a gearbox failure and an order for Bentley pinion bearings. | 19th Nov 1936 | Box 94 \ 2 scan0069 | |
| Test results for a modified 3rd and 4th sliding piece after weakening the concertina section. | 19th Nov 1936 | Box 94 \ 2 scan0070 | |
| Test results graph showing load versus deflection for a weakened type sliding piece, RM 855. | 20th Nov 1936 | Box 94 \ 2 scan0071 | |
| Blueprint detailing load and deflection tests on a weakened type sliding piece. | 20th Nov 1936 | Box 94 \ 2 scan0072 | |
| Blueprint detailing load and deflection test results for a sliding piece component. | 11th Nov 1936 | Box 94 \ 2 scan0073 | |
| Graph and diagram illustrating the results of a load test on a sliding piece component. | 11th Nov 1936 | Box 94 \ 2 scan0074 | |
| Letter to Ransome & Marles Ltd. inquiring about the delivery of an order for bearings. | 21th Nov 1936 | Box 94 \ 2 scan0075 | |
| Instruction to the fitting shop to fit a non-flexible concertina coupling to a Phantom III gearbox. | 21th Nov 1936 | Box 94 \ 2 scan0076 | |
| Gearbox engagement depth recommending a gauge to check the selector position for 2nd and 3rd speeds. | 23th Nov 1936 | Box 94 \ 2 scan0077 | |
| Request for production parts to make the 32-EX gearbox passably quiet. | 23th Nov 1936 | Box 94 \ 2 scan0078 | |
| Production problems and faults with Phantom III gearboxes, including a comparison with Cadillac-type gears. | 24th Nov 1936 | Box 94 \ 2 scan0079 | |
| The trial of fitting Cadillac continuous and second gears into RR-type gearboxes for the Phantom III. | 23th Nov 1936 | Box 94 \ 2 scan0080 | |
| Disadvantages of the Phantom III gearbox and proposing modifications. | 23th Nov 1936 | Box 94 \ 2 scan0081 | |
| Potential improvements to gearbox and synchromesh design, including suggestions for a 4-speed configuration and adopting Packard's designs. | 23th Nov 1936 | Box 94 \ 2 scan0082 | |
| Potential modifications to the Phantom III gearbox, considering a three-speed with overdrive. | 24th Nov 1936 | Box 94 \ 2 scan0083 | |
| Instruction to fit new quieter bearings to the Phantom III gearbox first motion shaft. | 24th Nov 1936 | Box 94 \ 2 scan0084 | |
| Modifications to a Phantom III gearbox to achieve a higher gear ratio. | 25th Nov 1936 | Box 94 \ 2 scan0085 | |
| Blueprint showing a gear cross-section and an arrangement of gear ratios. | 25th Nov 1936 | Box 94 \ 2 scan0086 | |
| Blueprint showing a casting design and gear ratio arrangement for an indirect higher top gear. | 26th Nov 1936 | Box 94 \ 2 scan0087 | |
| Letter from the Experimental Department requesting a higher capacity gearbox bearing with specific dimensions and load requirements. | 26th Nov 1936 | Box 94 \ 2 scan0088 | |
| Letter to Ransome & Marles Bearing Co., Ltd. regarding a rear gearbox support drawing and bearing clearance. | 27th Nov 1936 | Box 94 \ 2 scan0089 | |
| Phantom III gearbox, considering a three-speed with an overdrive. | 27th Nov 1936 | Box 94 \ 2 scan0090 | |
| Letter from Ransome & Marles Bearing Co. Ltd. discussing a proposed double row bearing design and cost. | 28th Nov 1936 | Box 94 \ 2 scan0091 | |
| Page 2 of a letter from a bearing supplier regarding bearing costs, performance, and quality. | 28th Nov 1936 | Box 94 \ 2 scan0092 | |
| Letter to The Hoffmann Manufacturing Co., Ltd. requesting various bearings for experimental gearbox testing. | 30th Nov 1936 | Box 94 \ 2 scan0093 | |
| Development of a Phantom III gearbox with an overdrive ratio. | 1st Dec 1936 | Box 94 \ 2 scan0094 | |
| Development of a Phantom III overdrive gearbox and a comparison to a Packard gearbox. | 1st Dec 1936 | Box 94 \ 2 scan0095 | |
| Letter from Hoffmann Manufacturing Co. Ltd. regarding the supply and specifications of specially made bearings. | 3rd Dec 1936 | Box 94 \ 2 scan0096 | |
| Drawing of a special ball bearing with dimensions and tolerances. | 3rd Dec 1936 | Box 94 \ 2 scan0097 | |
| Design reasons for using a separate gearbox in the Phantom III. | 3rd Dec 1936 | Box 94 \ 2 scan0098 | |
| The length of the propeller shaft, position of the cross frame, and engine/gearbox design. | 3rd Dec 1936 | Box 94 \ 2 scan0099 | |
| Issues with noisy gearboxes on the Phantom II and potential improvements. | 4th Dec 1936 | Box 94 \ 2 scan0100 | |
| The effect of softer gearbox mountings on noise reduction. | 4th Dec 1936 | Box 94 \ 2 scan0101 | |
| Parts of a gearbox for investigation into ball bearing noises. | 4th Dec 1936 | Box 94 \ 2 scan0102 | |
| Letter from a bearing manufacturer regarding a gearbox support and a corresponding drawing. | 7th Dec 1936 | Box 94 \ 2 scan0103 | |
| Request to replace a fractured shaft on gearbox no. 4.HS. | 7th Dec 1936 | Box 94 \ 2 scan0104 | |
| Recommendation to use fine pitch gears for Phantom III C. Series Chassis gearboxes. | 8th Dec 1936 | Box 94 \ 2 scan0105 | |
| Instructions to repair gearbox 4.HS by replacing the 2nd speed driver gear and removing a locating plate. | 8th Dec 1936 | Box 94 \ 2 scan0106 | |
| Requesting a cost analysis on the savings from using cheaper materials for specific gearbox components. | 8th Dec 1936 | Box 94 \ 2 scan0107 | |
| Standardisation of parts report for the Phantom III 'Concertina' 3rd speed coupling. | 26th Nov 1936 | Box 94 \ 2 scan0108 | |
| Cost estimate for extra jigs, tools, and equipment for the 'C' series chassis production. | 10th Nov 1936 | Box 94 \ 2 scan0109 | |
| Distortion issues in Phantom gearbox gears due to spline hardening and proposing solutions. | 10th Dec 1936 | Box 94 \ 2 scan0110 | |
| Cost reduction for Phantom III gearbox parts due to simplified machining. | 10th Dec 1936 | Box 94 \ 2 scan0111 | |
| The cost savings for Phantom III coupling shafts by using Carbon Steel instead of Nickel Steel. | 11th Dec 1936 | Box 94 \ 2 scan0112 | |
| Failure and replacement of parts for Gearbox No.4.HS. | 11th Dec 1936 | Box 94 \ 2 scan0113 | |
| Special bearing received from Ransome & Marles for a Phantom III gearbox dynamometer test. | 11th Dec 1936 | Box 94 \ 2 scan0114 | |
| Unnecessary slack in gearboxes and the cause of chunking. | 12th Dec 1936 | Box 94 \ 2 scan0115 | |
| Distorted and worn clamping washer on a 35 FX Gearbox 2nd Motion Shaft, with suggestions for a redesigned part. | 12th Dec 1936 | Box 94 \ 2 scan0116 | |
| Comparison between an existing and a suggested stiffer clamping washer for a front end 2nd motion shaft. | 12th Dec 1936 | Box 94 \ 2 scan0117 | |
| Proposal detailing material specifications for returning to non-casehardened splines in Phantom gearboxes. | 14th Dec 1936 | Box 94 \ 2 scan0118 | |
| Technical memo regarding failures of the Phantom III gearbox 2nd motion shaft and a proposed strengthened design. | 14th Dec 1936 | Box 94 \ 2 scan0119 | |
| Technical memorandum discussing issues and proposed solutions for Phantom Gearboxes, specifically regarding steel hardness and spline performance. | 14th Dec 1936 | Box 94 \ 2 scan0120 | |
| Invitation to F.O. Hickling for a visit concerning axle bearings. | 14th Dec 1936 | Box 94 \ 2 scan0121 | |
| Quotations for Phantom III gearbox costs for various parts and materials. | 14th Dec 1936 | Box 94 \ 2 scan0122 | |
| Material quotes for a Phantom III Gearbox lever. | 15th Dec 1936 | Box 94 \ 2 scan0123 | |
| Machining and broaching operations for Phantom gearboxes on material with a Brinell figure of 360 to 380. | 15th Dec 1936 | Box 94 \ 2 scan0124 | |
| Alteration and hardening of a washer for the Phantom III Gearbox. | 16th Dec 1936 | Box 94 \ 2 scan0125 | |
| Results of a 2nd and 3rd gear modification for Phantom III gearboxes. | 16th Dec 1936 | Box 94 \ 2 scan0126 | |
| Outlining modifications and preparations for gearbox dynamometer testing. | 17th Dec 1936 | Box 94 \ 2 scan0127 | |
| Side shaft noise of an 8 HS. Gearbox and instructing a change of bearings. | 17th Dec 1936 | Box 94 \ 2 scan0128 | |
| Experiment on the Phantom III Gearbox involving bushes pressed into the 2nd speed pinion. | 17th Dec 1936 | Box 94 \ 2 scan0129 | |
| Outlining factory cost savings for Phantom III gearbox parts when manufactured with alternative materials. | 15th Dec 1936 | Box 94 \ 2 scan0130 | |
| List of purchased parts for a P. III gearbox, detailing materials and prices. | 21th Dec 1936 | Box 94 \ 2 scan0131 | |
| Measurements and tolerances for P.3 gearbox 1st motion shaft bearings. | 21th Dec 1936 | Box 94 \ 2 scan0132 | |
| Tolerances and interference fits of the Phantom 111 gearbox first motion shaft bearings. | 23th Dec 1936 | Box 94 \ 2 scan0133 | |
| Instructions regarding ball bearing clearances, tolerances, and fits to address noise issues. | 23th Dec 1936 | Box 94 \ 2 scan0134 | |
| Specification sheet for the 1st motion shaft bearings for the Phantom III chassis. | 18th Dec 1936 | Box 94 \ 2 scan0135 | |
| Letter from Hughes-Johnson Stampings Ltd. requesting quantities for forgings against four specific patterns to provide an estimate. | 28th Dec 1936 | Box 94 \ 2 scan0136 | |
| Letter to The Hughes-Johnson Stampings Ltd. regarding costs for parts based on previously sent drawings. | 29th Dec 1936 | Box 94 \ 2 scan0137 | |
| Requesting modifications to a gearbox to reduce chunking noises. | 30th Dec 1936 | Box 94 \ 2 scan0138 | |
| The Phantom III Gearbox selector rod plunger housing, its material, and manufacturing process. | 31th Dec 1936 | Box 94 \ 2 scan0139 | |
| Cost-reduction proposal for the Phantom III Gearbox reverse actuating shaft. | 31th Dec 1936 | Box 94 \ 2 scan0140 | |
| Modifications for gearbox no. 4.HS for further testing. | 31th Dec 1936 | Box 94 \ 2 scan0141 | |
| Fitting an overdrive gearbox to either the long chassis 38-EX or a Trials car. | 2nd Jan 1937 | Box 94 \ 2 scan0142 | |
| Works order for car 36-EX detailing the replacement of gearbox bearings and the fitting of a new exhaust system. | 4th Jan 1936 | Box 94 \ 2 scan0143 | |
| Costs of various Phantom III gearbox components from different foundries. | 5th Jan 1937 | Box 94 \ 2 scan0144 | |
| Estimate from The Hughes-Johnson Stampings Ltd. for drop forged parts. | 6th Jan 1937 | Box 94 \ 2 scan0145 | |
| Cover letter from The Hughes-Johnson Stampings Ltd. enclosing a quotation for parts. | 6th Jan 1937 | Box 94 \ 2 scan0146 | |
| Inquiry about the readiness of a car with a 3-speed box and over-drive, referencing a previous communication. | 4th Jan 1937 | Box 94 \ 2 scan0147 | |
| Requesting the use of car 34-EX for testing a new 3-speed and overdrive Phantom III gearbox. | 6th Jan 1937 | Box 94 \ 2 scan0148 | |
| Request for a quotation on part G.84366 in cast iron to investigate gearbox cost reduction. | 8th Jan 1937 | Box 94 \ 2 scan0149 | |
| Phantom III gearbox testing, detailing failures and running times of various components. | 8th Jan 1937 | Box 94 \ 2 scan0150 | |
| Gearbox failures, modifications, and updated testing procedures. | 8th Jan 1937 | Box 94 \ 2 scan0151 | |
| Letter requesting a quotation for gearbox bearings and an update on rear axle investigations. | 8th Jan 1937 | Box 94 \ 2 scan0152 | |
| Request for a pair of modified 2nd speed cones for a Phantom III gearbox. | 11th Jan 1937 | Box 94 \ 2 scan0153 | |
| Requesting a rebuild of gearbox No.8.HS to investigate the effect of motion shaft bearings on side shaft noise. | 12th Jan 1937 | Box 94 \ 2 scan0154 | |
| Letter to Ransome & Marles Bearing Co. requesting various bearings for experimental purposes. | 16th Jan 1937 | Box 94 \ 2 scan0155 | |
| Comparing Cadillac gears with in-house gears for the Phantom III gearbox, discussing noise, chunking, and cost. | 18th Jan 1937 | Box 94 \ 2 scan0156 | |
| Parts for a Phantom III gearbox to address chunking and inquiring about the status of related experiments. | 18th Jan 1937 | Box 94 \ 2 scan0157 | |
| Query regarding the relative cost of replacing Phantom III gearbox bearings with angular contact bearings. | 18th Jan 1937 | Box 94 \ 2 scan0158 | |
| Experiment to determine the effect of end clearance in thrust bearings on gearbox chunking. | 18th Jan 1937 | Box 94 \ 2 scan0159 | |
| Conclusion of a memo stating that the cost of an improvement is being determined and recommendations will be issued after further experiments. | 19th Jan 1937 | Box 94 \ 2 scan0160 | |
| Requesting the production of specific gearbox parts and engine couplings, and proposing a material change. | 19th Jan 1937 | Box 94 \ 2 scan0161 | |
| Dynamometer testing of gears with soft splines, with a conclusion to delay standardisation until further road testing is complete. | 19th Jan 1937 | Box 94 \ 2 scan0162 | |
| Requesting modifications to gearbox 8.HS to gain experience with soft splined gears and then fit it to car 36-EX. | 20th Jan 1937 | Box 94 \ 2 scan0163 | |
| Cost comparison for Phantom III Gearbox inner cores (part G.84366) in cast iron from two different foundries. | 22th Jan 1937 | Box 94 \ 2 scan0164 | |
| Progress on various schemes for the Phantom III Gearbox. | 25th Jan 1937 | Box 94 \ 2 scan0165 | |
| List of requested changes for the P.3. Gearbox 14.HS. for the 39-EX model. | 26th Jan 1937 | Box 94 \ 2 scan0166 | |
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