07-09-2020, 01:41 PM
At 60 mph the engine speed difference between a 5,25 final drive and a 5,625 one is less than 300 revs/min. Thats hardly going to put it into screaming its head off territory. Austin Sevens are in any case overgeared. Normally fitting a 5.625 final drive, results in a higher top speed, particularly if you have standard sized wheels and tyres.
Alan Fairless