The peanut that I got the cluster from must have been too busy using both his arms and a mirror trying to pinpoint the exact location of his arse to have had any time to check that what he was telling me was correct because we have the 1.38 third gear mentioned in my post above as the standard V8 ratio set, we wanted the 1.25 which is what he told me we were getting....from June 12 2012
Just ordered an M21 cluster and new third gear. we go from 1.51:1 down to 1.25:1 which means we hit top at 5600 instead of 4700.
so there we go.