The 5.7L and 6.1L Hemi is Diablosport 7135. Check the Diablo site for applications. Personally I have not heard of anyone using anythings else.

 

I doubt it will work.

The gear ratios between the truck/durango are probably not the same.

I don't think the transmissions are the same, either.

The tuner changes more than just the engine parameters, it affects the torque management, shift points and stability control, all of which will be affected by tire size, transmission and gear ratio.

Not likely to do much except stick you in limp mode. Second gear, no higher...

U7135 is what you want.

 

I agree with them. Unless you're getting an insane deal on it, you'll wanna go with the U7135. Besides, I'm sure there's a Dakota/Durango owner or two {million} out there who may be slightly interested.
Like me...

Check out Dakota Forums or similar to sell it, so you can get the right one for the LX 5.7.

Did I mention I have a Dakota?