Well I was told mine had a 3.9 : 1 in it, and I got myself a 4.1:1 cheap to replace it with.
Got one of our Mechanics to do it.....and out came the old ones..I counted the teeth...simple division...
original was a 3.7:1..which meant I was in for a rather better "rev increase" for my money
and along with the RON plug swap over for Optimax goodness....
we have a proper car on our hands
Third gear WAS just below 90 and is now maxed out mid 70's at 7000 rpm
Just been up the "test road" and I bottled it at just over 100 before the corner...previously bottled at 93 ish every time.
We have a potential rally car on our hands.