AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
It doesn't theoretically matter how many teeth the gears have but....
On the 145 TD 5th gear , the 39T and the 31T gear cogs fit on the mainshaft and countershaft respectively and they are a certain size so that when they're both on their shaft they "engage" with each other.
If the Tipo gear cogs have less teeth (31T and 27T respectively) then they must be smaller. Even if they do fit on the 145 gearbox shafts, there will be a gap between them. So your mainshaft will turn but there will be no enagagement to the countershaft.
Smaller gears are used when the distance between the mainshaft and the countershaft is smaller.
This weekend I'll put my two old gears together side by side (like they fit inside the gearbox) and measure the distance (approx) between the centre of each gear cog. I think if you position your Tipo gear cogs the same distance apart, then the gears won't touch any more.
Last edited by Ralf S.; 20-11-13 at 14:12.