Nitrorocket,
I have 4l80e in my 37 ford with a 710 bbc.And it live's.I've made acouple 9's passes with and and have had it to 165 mph,(playin with a zo6)with no problem.plus I tend to punish the hell out of it.
Your TT ls1 doesn't doesn't make anymore hp than my 710 (1050hp),without nos,so if you have a 4l80e in there I wouldn't change it yet,I don't think a GV overdrive is that strong.
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