Hmm Richard
I can see why those ratios wouldn't be the greatest
Personally I'm a five speed guy, six speed boxes have never been my bag.
My 4.7 litre Aston Martin V8 Vantage had a six speed Graziano transaxle and the truth is it wasnt the best, typical of an Italian transmission second was baulky until the thing was fully warm and it took ages in the winter to get the tans oil up to temp, the clutch was awful too but that's another story.
I also couldn't help feeling you really shouldn't need six speeds in a 470hp car
By contrast, the five speed Mazda MX5 box in Monty is an absolute delight, it has a lovely light but direct change and as far as I'm concerned the ratios are all spot on. In simple terms, it's everything a good five speed transmission should be, i.e it's just a nice four speed box for attacking the fun winding A & B roads, but with the addition of a well chosen and usable overdrive gear for motorway work.
Why you would need a six speeds, when you can have all that in a five speed transmission is beyond me
PS: Two good online gear calculators can be found here:
https://www.boosttown.com/gearbox_differential/speed_calculator.phphttps://www.gearboxman.co.uk/ratio-calculator/
