Ross - I'm running a similar combo as yours, with a 465 roller cam engine, 0.64 fifth gear, 275/60-15 tires, but I currently have a 4.00:1 gear with a tru-trac. I'm moving the tru-trac to a different car and have a locker to replace it for this car. As the pumpkin is coming out to install the locker, and the 4.00s make a little whine on coasting, I got to thinking how a 4.30:1 ratio may work in place of the 4.00.
Do you think that would be a good move?
Thanks!