Hey guys, I'm looking to get a new stall converter for my 4r70w. I see a website that has a converter for $308. I believe it's 11 3/4 diameter and has a stall speed of 2500 rpm. Is this a good speed to utilize with 4:10's and future cam upgrades, porting and polishing, etc....also, does anybody have an idea on how much it would cost to have it installed? Any useful advice is greatly appreciated.