The coupe is magic for unrestricted cruising, however for track days and the road the gears are just a bit to long.

Someone suggested to me perhaps a tipo diff head (crown and pin) or a thema etc might fit into the coupe 5 speed box and have a lower factory ratio - assuming they share the same gearbox, maybe even an N/A 16v coupe

Anyone researched this?

the LSD on the coupe is outside the box so could this work to lower the ratios I guess?

Cheers

I used to run a tipo sedicivalve gearbox and was a close ratio box, only trouble with that, is that it uses a push type clutch (although could be converted to pull) and you needs rods to operate the gearbox

Are all tipo sedicivalve gearboxs close ratio or was that a special

The closest ratio gearbox is the lancia dedra 1.8 and tipo 1.8 16v but that are rod operated gearboxes and are much much smaller and weaker than the coupe 16vt ones. You could use the croma 2.0 16v gearbox internals.

are the croma gears just as strong etc and do you know what the ratio is?

16V and 16VT use quite different gearboxes. 16V is like a Tipo 16V. 16VT is like a Thema or Integrale. The internals dont mix afaik.

You could swap the whole gearbox but the 16VT type box is ment to be a lot stronger. Although ive never had any trouble with my 16V based gearboxes.

At a guess a Thema/Croma etc would be the same or worse. Integrale would be the best bet to look up.

There is no doubt to what steve has said, the boxes are very different I would say the coupe box is the same as the alfa v6 box (not sure). I have ordered all the parts to convert my tipo box to cable shift which will use the same cables as the coupe. Using parts from 146 gamma 1.6TS. That box is the same as tipo 16v. I used a multipla final drive and (CW and Pinion) correct me if Im wrong but the pinion is on the output shaft so you have to dissassemble the box to change the ratio?? I got someone to rebuild mine. In fact I will be taking out that Final drive and gear kit as I have just bought Bacci Romano gear kit 13/53 final drive and LSD - wow thats expensive plus 20% tax. I would think that taking the cover off the turbo diff housing and comparing the crown wheels would be the only way. or look at catalogues to see if there's commonality.

don`t know the exact ratio but everything is as strong as the coupe and you can swap all of the parts into yours gearbox, you could also use the parts from stilo abarth gearbox, alfa v6, thema 2.0 16v/t. The best way to know the ratio is to take of the diff cover and count the teeth