8 tonne bedford cargo truck help

[lemon-aid jay]

I have some diffs and t-case out of a bedford TM 8 tonne. I have been trying very hard to find out more info on the diffs. I need to know were I can find parts or if someone knows were to find more of the same diffs that would be great to. this is what I have foud so far.The front axle is a Kirkstall fully floating, single-speed, spiral bevel with 3.857:1 hub reduction with overall axle ratio of 5.887:1. The rear axle is also a Kirkstall fully floating, single-speed, spiral bevel with 3.857:1 hub reduction and air-actuated differential lock. Overall axle ratio is 5.887:1. I am trying to see if there are other options for the ring and pinion.I would like to get the ratio alittle lower.
Any help would be great

Thanks Lemon-aid jay