There's a whole bunch of reasons why this is a good diff to have.
1./ The pinion to crown wheel height is one of the lowest of OEM diffs making it one of the most efficient, way more so than a 9 inch.
2./ We have 2.14:1 ,2.28:1 , 2.41:1 and 2.56:1 ratios. There are 2.73:1 and 3.08:1 ratios also available.
3./ It has a Torsen centre which is a worm gear torque sharing diff, no springs, no clutches, no( well, much less) dual wheel spin if you get greedy on the gas.
We didn't go for a complete transplant because,
1./ We wanted to keep the Ford stud pattern.
2./ If we did swap the whole third member we would have had to build another jig to sit the car on to make sure it was true, THEN get the welding in
right again, the car has run straight up to nearly 200mph, so we know it's pretty good.
But most of all, compared to other options , none of which I really liked.....9inch?, Quick Change? Borg-Warner Statesman 2.6:1? had the same pros and they had cons that didn't stack up.It was Sparky( Bill Smith) from Phoenix Arizona who has run over 300 with a big-block lakester who encouraged us to put this together.... Then he marshaled all the parts and gave them to Norm Hardinge who brought them back from Bonneville for us.We have been done a lot of favours here and spent a lot of time , we've spent around $1000 but we won't find a better spread of ratios or a better centre for what we're trying to do.
We could put 800hp into it if Sparky's experiments(records) are to be believed.....at 2.56:1 we are running at about 34mph/1000rpm....I'll let you do the sums on where we could go, if we had the dough.
![Wink :wink:](./images/smilies/icon_wink.gif)
...few understand what I'm trying to do , but they vastly outnumber those who understand why..