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Just having a think (as you do) what Vauxhall had the overdrive box?
May be the VX490?

I think Vauxhall were all 4 speeds over here. The Humber was the only
one I can think of with overdrive and some of the very late MK2 Transits

Now all those 6 speed boxes have 2 overdrive gears and soon will have 3,
(7 speed) incredible stuff
 
Yes the VX4/90 also the Ventora and Cresta/Velox. The early Cresta ones were three speed but all the others 4 speed. I bypassed the inhibiter switch so the overdrive would work on all gears except reverse, it would slip in first if you pushed it but otherwise gave you a choice of seven gears.

Peter
 
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