Various manuals and instructions by Laycock de Normanville who manufactured the overdrive for Volvo 1800
Laycock de Normanville Type D Overdrive workshop manual
Overdrive (Laycock De Normanville)
Service instruction manual for the Laycock-de-Normanville overdrive unit with electrical control
Volvo Overdrive Diagnostic and trouble shooting. Volvo part number 7777943-7
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