We received this email earlier in the week. If anyone here is able to help, let me know and I'll put you in contact with the sender.
- Please advise type of diff and ratio of ex Action Bus 751. Also require any info regarding changing ratios to gain a little more speed.Thank you for your assistance in this matter and Merry Christmas
751 wouldn't be any different to any of the other Mark 2 Renaults. The diff ratio is 16:41. As far as changing the ration to gain more speed, probably the easiest way would be to get new crown wheels made up with less teeth.