Re: Tunnel Work and diff ratios?
The tunnel should fit the 4 speed no drama, i think the main issue with cortinas was going from manual to auto (i belive manual tunnel was smaller).
Diff ratio doesnt really matter, manuals had higher ratios, 3.2 or so, I will guess you have 3.7 or 3.9 diff with the manual you are going to have fun, but speedo will be out.
I did put something here, but it vanshied, I think
"So long and thanks for all the fish!"