Wotcha Chaps

I've read somewhere that the later GS's had revised software in the gearbox controller to allow the overdrive to work in 3rd as well as 4th so providing 5 speeds instead of 4 .

Any idea if this is true and if the later ECU is backwards compatible with a 96 GS.
Also which year ECU do I need and where does it live in any case?

Ta

I have read this too, but have never been able to get anyone to actually confirm it. I beleive the change happened at some point during production of the mk1, but again I cannot seem to find out when. Have you confirmed yours is [b]definately[/b] 4 speed? I'm sure mine changes gear enough times to be 5 (4 gear changes), but to get a definate count of gear changes the car needs to be pushed hard so that multiple changes don't happen at once, so the speed reached kept stopping me getting a solid count.