4l80e or t56??
Ah,.which is better for you? What are you doing with the vehicle? If someone like myself suggested, it would be a manual, all day. Made over 780 wheel, on a stock T56, in a daily driven application. Totally stock T56, other then shifter mods. A clutch would be your concern, that or the differentials.
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If you pick t56 go with a t56 magnum or tr6060. They are stronger and hold power better. Think its the output shaft of the normal t56 is kind of weak and the magnum/tr6060 have bigger/stronger output shafts.
4L80 is the best street strip auto for a GM car period. It is a little expensive to get into a C5 or C6 if you have someone do it because there is a lot of trimming to get it to fit. I prefer and auto and if you have the money a 4L80 would get my vote. Bulletproof. However with 750 rwhp a built 4L60 will hold up and fit with no trans tunnel modification.
