Charlie,

The 4.4:1 ratio will make the car feel very spirited off the line and as long as you dont run out of puff will perform well....if funds allow have another diff available to put in for the longer circuits. We only have 3 bolts on each of the rear lobro joints to make exchanging the diffs easier, the remaining 3 bolt holes are filled by replacing them with dowels, that way you still have the necessary strength but less time faffing around changing the diff......just make sure you re-check them at shortish intervals to ensure they stay tight....

Regards

Ian