| Description | Date | Identifier | |
| Tests to improve the synchromesh operation on the Phantom III gearbox, specifically regarding the bedding of cones. | 24th Feb 1936 | Box 94 \ 1 scan0339 | |
| The bedding of cones in a Phantom III Gearbox. | 24th Feb 1936 | Box 94 \ 1 scan0340 | |
| Testing fine thread cones in an HS8 gearbox for bedding-in purposes. | 24th Feb 1936 | Box 94 \ 1 scan0341 | |
| Test report on a Phantom III No.5 Gearbox after modifications to core angles and fitting new ball races. | 24th Feb 1936 | Box 94 \ 1 scan0342 | |
| Invoice from British Tyre & Rubber Co. Ltd. for vulcanising rubber blocks to metal housings. | 24th Feb 1936 | Box 94 \ 1 scan0343 | |
| Gearbox issues, specifically gear mesh and synchromesh failure, for the Phantom III Hs.5. | 27th Feb 1936 | Box 94 \ 1 scan0344 | |
| Internal request to place an official order for buffers and metal housings. | 27th Feb 1936 | Box 94 \ 1 scan0345 | |
| Modifications to the Phantom III gearbox lubrication scheme. | 2nd Mar 1936 | Box 94 \ 1 scan0346 | |
| Modifications to the lubricating scheme for the Phantom III Gearbox. | 2nd Mar 1936 | Box 94 \ 1 scan0347 | |
| Instruction for modifying the Phantom III gearbox by shortening the inner synchromesh cones. | 3rd Mar 1936 | Box 94 \ 1 scan0348 | |
| Results of extensive tests on Phantom III gearbox synchromesh cones. | 5th Mar 1936 | Box 94 \ 1 scan0349 | |
| Clutch drive test, concluding that the bronze and steel cones are not sufficiently rigid. | 5th Mar 1936 | Box 94 \ 1 scan0350 | |
| Request to drill holes in the Phantom III gearbox's 2nd speed synchromesh cone. | 12th Mar 1936 | Box 94 \ 1 scan0351 | |
| Drilling holes in the Phantom III Gearbox 2nd Speed Synchromesh Cone. | 12th Mar 1936 | Box 94 \ 1 scan0352 | |
| Increased area of thrust washers for the Phantom III differential gear. | 24th Mar 1936 | Box 94 \ 1 scan0353 | |
| Modification to increase the area of thrust washers for the Phantom III differential gear. | 24th Mar 1936 | Box 94 \ 1 scan0354 | |
| .003 inch correction required on the top gear cone of a Ph.III Gearbox No. 33-EX. | 30th Mar 1936 | Box 94 \ 1 scan0355 | |
| Technical memo about gearbox gears working out of mesh and the required clearances. | 2nd Apr 1936 | Box 94 \ 1 scan0356 | |
| Gearbox design improvements and addressing gears working out of mesh for various car models. | 3rd Apr 1936 | Box 94 \ 1 scan0357 | |
| Enquiry to Silentbloc Ltd. for performance data and cost of a bush for a rear engine mounting. | 21th Apr 1936 | Box 94 \ 1 scan0358 | |
| Blueprint illustrating load and torque requirements for a cylindrical component. | 22th Apr 1936 | Box 94 \ 1 scan0359 | |
| Letter from Silentbloc Limited providing specifications and pricing for Silentbloc Bearings. | 22th Apr 1936 | Box 94 \ 1 scan0360 | |
| New design of dirt covers and Arens control routing for the Phantom III gearbox. | 24th Apr 1936 | Box 94 \ 1 scan0361 | |
| Request to complete Phantom III gearbox No. 4HS for chassis 33-EX with specific modifications. | 24th Apr 1936 | Box 94 \ 1 scan0362 | |
| Letter from Silentbloc regarding tolerances for part number G.84361. | 27th Apr 1936 | Box 94 \ 1 scan0363 | |
| Letter to Silentbloc Ltd. detailing revised drawing specifications for unit G.84361. | 29th Apr 1936 | Box 94 \ 1 scan0364 | |
| Modifications to the Gearbox Stay for the Phantom III. | 30th Apr 1936 | Box 94 \ 1 scan0365 | |
| Confirming modifications to the Phantom III gearbox speedo drive lubrication system. | 9th May 1936 | Box 94 \ 1 scan0366 | |
| Investigation into the Phantom III speedometer drive running dry and the recommendation to drill additional oil holes. | 15th May 1936 | Box 94 \ 1 scan0367 | |
| Noisy rear bearing on the Phantom III gearbox first motion shaft. | 15th May 1936 | Box 94 \ 1 scan0368 | |
| Design change for the Phantom III Speedometer Drive, specifically concerning drain holes and an oil retaining washer. | 18th May 1936 | Box 94 \ 1 scan0369 | |
| Requested improvements for experimental gearboxes. | 23th Dec 1936 | Box 94 \ 1 scan0370 | |
| Experiment on a gearbox with original unlapped first motion shaft bearings. | 23th Dec 1936 | Box 94 \ 1 scan0371 | |
| Letter to Hughes-Johnson Stamping Co. Ltd. requesting a cost reduction quote for small gearbox levers. | 23th Dec 1936 | Box 94 \ 1 scan0372 | |
| Requesting a modification to a Phantom III gearbox's 3rd motion shaft for a dynamometer test. | 25th May 1936 | Box 94 \ 2 scan0001 | |
| Synchromesh issue on a Phantom III gearbox for car 32-EX and instructing the preparation of a modified replacement gearbox. | 29th May 1936 | Box 94 \ 2 scan0002 | |
| Checks and modifications for various car gearboxes. | 5th Jun 1936 | Box 94 \ 2 scan0003 | |
| The production of the scoop lubrication scheme for the Phantom III Gearbox. | 5th Jun 1936 | Box 94 \ 2 scan0004 | |
| Use of stronger versus weaker selector rod springs in the Phantom III gearbox. | 5th Jun 1936 | Box 94 \ 2 scan0005 | |
| Modifications and testing for Phantom III gearboxes due to issues with gears jumping out of mesh. | 8th Jun 1936 | Box 94 \ 2 scan0006 | |
| Experimental modification to the Phantom III gearbox using acme splines. | 10th Jun 1938 | Box 94 \ 2 scan0007 | |
| Suggesting fitting non-floating gear bushes to the Phantom III gearbox to reduce gear rocking and wear. | 11th Jun 1928 | Box 94 \ 2 scan0008 | |
| Proposing an experiment on steel thrust washers for the Phantom III gearbox 3rd speed gears. | 11th Jun 1938 | Box 94 \ 2 scan0009 | |
| Requesting a modification for an 'Isolated Change Gear Lever' to be carried out on a different vehicle. | 13th Jun 1936 | Box 94 \ 2 scan0010 | |
| Proposal to remedy an issue with the Phantom III gearbox 2nd speed coupling by applying a universal ring. | 15th May 1936 | Box 94 \ 2 scan0011 | |
| Sketch showing wear on bushes in the 35-EX Gear Box. | 15th Jun 1936 | Box 94 \ 2 scan0012 | |
| Drawing and measurement table for 2nd and 3rd speed gear bushes. | 10th Jun 1936 | Box 94 \ 2 scan0013 | |
| Tests to determine the frictional resistance of the top gear sliding piece in a Phantom III Gearbox. | 16th Jun 1936 | Box 94 \ 2 scan0014 | |
| The trial of a different ball bearing for the Phantom III gearbox and the ordering of parts for two types of gearbox. | 16th Jun 1936 | Box 94 \ 2 scan0015 | |
| Listing required parts and modifications for a Phantom III Gearbox, box No. 10HS. | 1st Jul 1936 | Box 94 \ 2 scan0016 | |
| Experiments on Phantom III gearboxes to prevent gears from coming out of mesh. | 8th Jul 1936 | Box 94 \ 2 scan0017 | |
| Trial of an 'Isolated Change Speed Mechanism' on 20/25 or Bentley cars before standardizing it for cost reduction. | 5th Aug 1936 | Box 94 \ 2 scan0018 | |
| Letter to The Associated Equipment Co. Ltd. inquiring about a scheme for preventing dog clutches working out of mesh in gearboxes. | 19th Aug 1936 | Box 94 \ 2 scan0019 | |
| Letter from the Associated Equipment Co. Ltd. regarding a scheme for preventing gearbox dog clutches from disengaging. | 20th Aug 1936 | Box 94 \ 2 scan0020 | |
| Application of a spherical thrust face to a Phantom III gearbox 2nd speed coupling. | 24th Aug 1936 | Box 94 \ 2 scan0021 | |
| Modification to a 2nd speed component, featuring a spherical seated washer, marked as not suitable for production. | 24th Aug 1936 | Box 94 \ 2 scan0022 | |
| Requesting further testing on a Phantom III gearbox experiment involving a soft third motion shaft. | 2nd Sep 1936 | Box 94 \ 2 scan0023 | |
| Two schemes to prevent the 3rd speed from working out of mesh on the Phantom III gearbox. | 8th Sep 1936 | Box 94 \ 2 scan0024 | |
| Excessive movement in the Phantom III engine and gearbox links, which can cause clutch jaggers. | 11th Sep 1936 | Box 94 \ 2 scan0025 | |
| Strengthened universal ring for the Phantom III Gearbox 2nd speed coupling. | 11th Sep 1936 | Box 94 \ 2 scan0026 | |
| Standardisation of an oil scoop on the gearbox 3rd motion shaft. | 3rd Sep 1936 | Box 94 \ 2 scan0027 | |
| Cost comparison between an old and new part, including estimated costs for extra jigs, tools, and equipment. | 26th Aug 1936 | Box 94 \ 2 scan0028 | |
| Issues with Phantom III gearboxes on four specific cars. | 22th Sep 1936 | Box 94 \ 2 scan0029 | |
| Issues with the Phantom III gearbox and the plan to build a test unit with new components. | 29th Sep 1936 | Box 94 \ 2 scan0030 | |
| Replacement gearbox for a Phantom III, chassis 3-AX-96, due to an issue with second and third gears. | 25th Sep 1936 | Box 94 \ 2 scan0031 | |
| Cancelling instructions for a Phantom III gearbox part, discussing potential synchromesh unit modifications. | 30th Sep 1936 | Box 94 \ 2 scan0032 | |
| Instructions for testing and modifying three specific Phantom III gearboxes. | 5th Oct 1936 | Box 94 \ 2 scan0033 | |
| Meeting report on modifications and testing for the Phantom III gearbox to address gears coming out of mesh. | 6th Oct 1936 | Box 94 \ 2 scan0034 | |
| Confirming the successful dynamometer testing of a modified part for the Phantom III axle and gearbox. | 7th Oct 1936 | Box 94 \ 2 scan0035 | |
| Endurance testing report on a Phantom III Axle and gearbox, including tests on larger differential washers, Cadillac gears, and an Oldham coupling. | 7th Oct 1936 | Box 94 \ 2 scan0036 | |
| Test report on modified components including a 'Concertina' 3rd speed coupling. | 7th Oct 1936 | Box 94 \ 2 scan0037 | |
| Torsional rating test results for a Phantom II gearbox fabric coupling. | 13th Oct 1936 | Box 94 \ 2 scan0038 | |
| Graph showing the results of a torsional rating test for a gearbox fabric coupling. | 7th Oct 1936 | Box 94 \ 2 scan0039 | |
| Torsional rating test results for a G.80232 Hardy Fabric gearbox coupling. | 16th Oct 1936 | Box 94 \ 2 scan0040 | |
| Graph showing the results of a torsional rating test on a gearbox fabric coupling. | 7th Oct 1936 | Box 94 \ 2 scan0041 | |
| Graph showing the results of a torsional rating test on a G80232 Hardy Fabric gearbox coupling. | 14th Oct 1936 | Box 94 \ 2 scan0042 | |
| Torsional rating test results for a G.80232 Hardy Fabric gearbox coupling. | 16th Oct 1936 | Box 94 \ 2 scan0043 | |
| Graph plotting the results of a torsional rating test on a Hardy Fabric gearbox coupling, showing angular movement versus torque. | 14th Oct 1936 | Box 94 \ 2 scan0044 | |
| Graph showing the results of a torsional rating test on a Hardy fabric gearbox coupling. | 7th Oct 1936 | Box 94 \ 2 scan0045 | |
| Modifications required for the gearbox of car 38-EX. | 26th Oct 1936 | Box 94 \ 2 scan0046 | |
| Modifications to the Phantom III gearbox, specifically concerning oil grooves for the 2nd speed pinion bushes. | 26th Oct 1936 | Box 94 \ 2 scan0047 | |
| Fault where the Phantom III gearbox jumps out of third gear and a proposed solution. | 27th Oct 1936 | Box 94 \ 2 scan0048 | |
| Requesting the incorporation of N.Sch.4940 2nd speed bushes for a 33-Ex gearbox, and for a second set for dynamometer testing. | 27th Oct 1936 | Box 94 \ 2 scan0049 | |
| And diagram regarding testing procedures for a 'Concertina' top and 3rd speed sliding piece for a Phantom III Gearbox. | 28th Oct 1936 | Box 94 \ 2 scan0050 | |
| Requesting the preparation of a standardisation sheet for a concertina piece. | 30th Oct 1936 | Box 94 \ 2 scan0051 | |
| Comparison of frictional torques between a Hoffmann journal bearing and an R & M double thrust bearing. | 2nd Nov 1936 | Box 94 \ 2 scan0052 | |
| Decision to use the concertina 3rd speed coupling on the Phantom III gearbox for immediate production. | 2nd Nov 1936 | Box 94 \ 2 scan0053 | |
| Cumbersome gearbox on the Phantom III and proposing to test a Packard gearbox as a replacement. | 4th Nov 1936 | Box 94 \ 2 scan0054 | |
| Improvements to sliding-couplings for a cheaper product. | 4th Nov 1936 | Box 94 \ 2 scan0055 | |
| Letter to Messrs. Ransome & Marles Bearing Co. Ltd. confirming arrangements for a visit. | 5th Nov 1936 | Box 94 \ 2 scan0056 | |
| Specifications for two new Phantom III wide feet gear boxes. | 5th Nov 1936 | Box 94 \ 2 scan0057 | |
| The updating of a Phantom III Gearbox No. 8 HS. | 10th Nov 1936 | Box 94 \ 2 scan0058 | |
| Proposals for reducing the effort required to operate the Phantom III gearbox. | 11th Nov 1936 | Box 94 \ 2 scan0059 | |
| Instructions for rebuilding a Phantom III gearbox following a failure on the dynamometer. | 12th Nov 1936 | Box 94 \ 2 scan0060 | |
| Deflection test results for the G.84834 concertina sliding piece. | 12th Nov 1936 | Box 94 \ 2 scan0061 | |
| Diagram and graph detailing the results of load versus deflection tests on a sliding piece. | 11th Nov 1936 | Box 94 \ 2 scan0062 | |
| Request to rebuild a failed Phantom III 4 HS gearbox with a list of new parts to incorporate following a dynamometer test failure. | 12th Nov 1936 | Box 94 \ 2 scan0063 | |
| The preference for standard front halves on Phantom III gearboxes. | 13th Nov 1936 | Box 94 \ 2 scan0064 | |
| The preference for standard front halves on Phantom III gearboxes. | 13th Nov 1936 | Box 94 \ 2 scan0065 | |
| Confirming the order and receipt of one MRJ.25 bearing from Ransome & Marles. | 14th Nov 1936 | Box 94 \ 2 scan0066 | |
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