Well as far as a rear locker goes, I am looking at detroit's ez-locker, powertrax and one other I cant remember right off hand. They are all similarly priced, who has what and how do yall like it? I was browsing ebay lookin at t18 and t19 stuff, and it looks like both of those are 4 speeds, and I think my tranny is only a 3 speed. Is this right or did I just not try hard enough to get it into reverse? I used a RPM calculator and with no overdrive, 3.73s and 33s my engine would be doing 2650 RPM at 70 mph. With 3.55's the motor would be doing 2530, and with 3.08s it would be doing 2195. Which of these is optimum for this motor? I intend to put a mild cam in it and in my experience with later model chevy V8s they are happiest cruising at around 2000 RPM. I deffinately dont want to go higher than 3.08s though.