Well I do know your not supposed to run solid mounts like aluminum and then rubber mounts too. And the 700 vs 400 is a never ending thing. The 400 you will loose hp, loose mpgs, it just depends on what your willing to trade for brute strength. If more people would beef up a 700 it would gain a bigger following. It's not a bad tranny, just needs a lil help. I'm tempted to pull my beefed up 400 and swap a 700 back in, 60mph and the 454 is howling, plus a lil better crawl ratio would help since I don't want a doubler. Just depends on what your looking for, stick vs auto is same thing, I hate sticks personally, and use them to hold down dumpsters every time I get one.