

The invention of Edgar de Normanville, it was originally called the de Normanville epicyclic gearbox. It's such a French sounding name from such a distinctly British company. There's something about the Laycock de Normanville mystique that I just love. The J-type overdrive is said to be stronger and able to withstand higher torque than the older D-type. The M46 is the younger sibling of the venerable M41 found in 1800 and in some 140 and Amazons and the more robust M410 found in the 1 E/ES. It is found in both 240 and 260 from 1975 through 1986. The overdrive unit on the M46 manual transmission is surely one of the most maligned and misunderstood parts in the Volvo 200 series.
