[Sizzler]

I don't understand your desire for a 5 or 6 speed.
If it's actually just a desire for an overdrive gear, then all you really need is a 4-speed automatic.

A 5-speed (and 6-speed) trans is only really needed behind engines that are peaky in the power curve or just plain low-powered, the idea being to have more gears available to keep the engine in its sweetspot rpm-wise in most driving situations. Any engine in a Cobra should have a sweetspot the equivalent of a Prince racquet in the back in the days of the little wood and gut racquets (how long ago it all seems).

And, any 5 or 6-speed automatic you find, probably won't live long behind any engine exhibiting any amount of torque over 300...torque is what a trans needs to handle, not HP.

If you want an automatic with an overdrive gear, I'd recommend Lentech, just let them know what sort of powerlevel will be coming through it. Otherwise, above, the name GearVendor came up: an add-on overdrive unit you can put behind virtually any 3-speed (or 2-speed) automatic ever built in the last 40 years or so, with an excellent reputation. Just need to verify total lengths (trans + OD unit).

As for transplanting foreign transmissions, with weird computers and dodgy harnesses, just to get paddle shifting. At SEMA, Moon Equipment was showcasing a add-on paddle shifter system for most popular American transmissions. Cost about $500. Don't know the cost on exotic axis trans, but I'm thinking it's probably cheaper, and Moon is a company I think should be supported given their history with streetrods.