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We are restoring a '28 AA pickup for a customer. He'd like to have a better diff ratio (and be able to travel faster than 40mph !) than what is available with the standard worm drive diff. Can someone please advise what conversions or modifications can be done to achieve this? We still want to...

We're restoring a 28 AA pickup for a customer but are wondering if there is a way to maintain the asthetics of the original worm drive diff, but change/adapt/convert to get a better diff ratio. Owner wants to be able to drive faster than 40mph !