Rear is an 8 1/4 open diff with 3.21's.. Trans is an A-230 3 speed. I'm going to go with a 3.55 sure grip sometime this summer though once I get the 340 in. It does ok off idle but it would probably do better if I didn't go for giant dual 3" flowmasters. 2 1/4 or 2 1/2 would be better suited for it. All in all Id say it's not bad though, especially for how mild it is.. It'll outrun my friends '73 350 Omega no problem.
