Differences in Lucas Wiper Motors

[Fox]

Ok... This is for all the guys out there who have the insatiable need to sweat the small stuff like I tend to do.

The original Shelby Cobra used a Lucas 75311 DR3 with a 120 degree gear, or so I am told. This is a two speed motor, 6-wire motor. The cheapest I can find is about $200 + a $200 core charge...

As I understand things, an alternative is to use an MG/Triumph Lucas motor and that the drive gear can may need to be changed or modified (as elegantly described in the ERA manual). I realize that these could be DR2 motors that are single speed and therefore 3-wire but visually pretty much the same as a DR3.

That being said what is the significance of the '75311' portion of the part number and what does it practically mean? Drive gear and/or degrees?

The reason I ask is that Land Rovers use a DR3 75664J and are reasonably priced and I would not need the all elusive core. I understand it may need a drive gear change or modification but it is two speed and would be visual and functionally corect...

I know to some this might be splitting hairs but I know to others out there that this stuff is... well... important.

Anyone... Anyone... Anyone...

-John