I guess I should have did my homework b4 before I made a post, but truth is I'm not even sure what my rear end is or what gears it has, I just assumed they were all the same for the 320's. I have a 1965 L320 with an A-14 engine and I'm pretty certain it's a stock rear end. I'm not really concerned with better gearing considering its going to be a full show truck and will not be driven daily.