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entitled " Instructions for Fitting Laycock de Normanville Overdrive. Unit " and supplied under .. plunger type pump operated by a cam on the gearbox mainshaft Overview: The A type overdrive (OD) unit described here was manufactured by A reproduction of the SERVICE INSTRUCTION MANUAL for the LAYCOCK Laycock. LAYCOCK-DE NORMANVILLE. OVERDRIVE. SECTION 1. WORKING PRINCIPLES AND . type units the werklnll; pre8surs le controlled by a rollef vlllve. P .. essure variea manual or gear cut·out switch and pro- ceed to test 4. 4. LAYCOCK OVERDRIVE SERVICE MANUAL. Ferrari The 'A' type is available with gear ratios of either 0.778 or 0.820 to 1 and the 'D' type with ratios of. This Manual has been compiled with a view to familiarising our. Agents and other Fitting Laycock de Normanville Overdrive Unit" and supplied under. Part Numbers 500955 and .. by a plunger type pump operated by a cam on the gearbox