Ok,

I have found the part numbers to be wrong and Kepsus has got the corrections. I have also corrected the part numbers in my previous post and corrected the gear ratios.

Correct:
774 51 53 and 608 11 731
37/30 - ratio

Please be aware that there are many references to my posts in this thread and that thse references still have the wrong information.

So, how could it get that wrong? Well, I searched in the Fiat ePER database for gearboxes to the 2.0 litre 16V Lampredi engine and found for the Lancia Delta HPE HF (which I knew had higher 5:th gear) some useful information for the TB model. Since I didn't check any engine details I didn't realise that the TB was a small SOHC Fiat engine found in the cheapest Lanica models. The turbo version was listed under 1750 cc 132 c.v. of some strange reason. The workshop who made the upgrade must have found the part numbers to be wrong, ordered the correct ones, but did never tell me. So, as you can see, the gear ratio is also a bit different 37/30 instead of 39/31.

Sorry.