[TR] overdrive

[Randall]

> Does anyone recognize these numbers from an o/d unit? 
> 22/61753/007684  Might have come from a spitfire.  Angle on 
> the  speedometer drive and solenoid indicate a type"A"  

According to the Moss catalog, that's an A-type from a TR4A IRS.  Should
have the smaller accumulator piston used on the IRS cars (to soften
engagement).

AFAIK, Spits never used A-types, only D and J.  Of course, no doubt someone
somewhere has hooked one up, but I don't think the factory did.

Randall