I can go down either route as I have a 4HA Salisbury axle on my 120 roadster.
The car will be used for long journeys but some acceleration is essential. I want to go to Germany, France and Italy from England.
I am not interested in hill-climbs or circuit racing in this old car.(not this year anyway).
I like 80/90 mph +.
I have a 3.07 E type and also 2.88 E type on 15 inch wheels and 4 speed synchro gearboxes.
I much prefer the 2.88, as it just gobbles up the road on long journeys. However the wheels are considerably smaller, so the gearing must be different.
On the 120 I have a fresh 4.2 engine running 170 psi on each cylinder until the 3.4 is ready. I also have the 4 sp. synchro E type gearbox. I have disc brakes. The rear calipers are 1 5/8 pistons, the front XK150 calipers with a small servo.
So what I am saying is that it should go and stop well.
Is 2.88 over doing it? Will 3.54 be more “in the zone”?
I have no experience on 16 inch wheels and tall tires, so I very much welcome comments from those that have done it.
By the way, I am using 16 inch Dunlop steels from a MK9.
If I get it wrong, I could swap the diff out later, as I have both diffs in the shed already rebuilt, ready to fit, so not big problem.