Wide, intermediate and close ratio types of gear sets were produced by Lagonda to suit different car models. For the Z gearbox these gear sets are referred to as ZC, ZD and ZE respectively. The individual gear ratios for a specific type of box are the same for both OH and Z gearboxes.
The gear sets produced by the Club are the close ratio type. If you have a wide or intermediate type of gearbox, all is not lost as an individual close ratio gear pair (main and layshaft) can be installed in a wide or intermediate box, with, of course, a resulting change in the box ratio.
An alternative third gear set is also available for both OH and Z gearboxes. This provides a lower third gear ratio, to bridge more evenly the gap between second and top.
The majority of OH Gearboxes have layshafts fitted with solid bearings and run on a separate spindle.
Later OH (and Z- type) gearboxes have a solid layshaft with spigots at either end to run in roller bearings.
Further details of these gearboxes can be found in the "Workshop Manual for 2 Litre Lagonda Gearboxes" available from the Club.
A 2 piece unit for a plain bearing lay-shaft gearbox.
For a late gearbox with roller lay-shaft bearings.
Not used on pre-selector cars. 2 off required.
Composite, single layer, drive coupling 0.560" thick including the top hat bush
For OH & Z boxes. 3 required per box.
Fits into brass cup that goes under the gearbox chassis rails, under the front engine mounting chassis bracket, between radiator and mounting bracket.
Glue or screw into sump plugs of gearbox. 20mm OD