A 4l80e. Swapping it and a hybrid aode/470w that will be for my Fairlane for a aquarium I have no use for. Even if I were to pay my trans buddy for the 4l80, it would be cheaper than a gear vendor, unless you can get the gv for around 2k. My car is probably going to have a 572 Hemi with a crossram, and to the best of my knowledge no kick down linkage exists, so I would need a manual valve body. With the 4l80e and the EFI that I will be using it will still be an automatic, no manual shifting, even at the dragstrip. My trans controller is adjustable in many ways. Under full throttle, set it to shift at xxxx rpm and it will. And I will still have the lock up convertor, of which I can have it lock up in any gear, so there will be no convertor slippage while climbing some of the hills around here. Controller also allows for different shift firmness based upon throttle position. Don't like the way it shifts, plug in the laptop and change a few settings. Some people have said it is not strong enough yet with very few upgrades in them they survive behind 1200 hp. Sure, when you couple the cost of the trans with the Quicktime SFI bellhousing and controller it would probably cost the same as a 727/gv, but with my car having efi in it I figured might as well use a non-stone age trans in it also........