Also I just got quoted roughly $600 for 4.10's. Here's my questions. Would a auto hit hard enough to warrant 31
$600 for gears, install, fluid, and install kit sounds about right. That's what I was quoted from three reputable shops in my area. (well, one in your area).
As for the axles, it really all comes down to what kind of tires and how much you plan on drag racing it. IMO the factory 28 splines are too weak to do a reasonable amount of 'real' dig races. It comes down to how much stress you put on them. 'Good' DR's and a serious amount of TQ would probably hurt even an auto. However, that's my opinion as i have no real world experience with gay-tomatics. (just playin' with ya). SEriously though, I've never driven an auto mach, so I don't know for certainty.:beer: My suggestion to you would be to research it a bit on the registry and compare what you find to what you are planning to do with the car. :beer: