Well, as it turns out, the ebst source I could find, for real world (not mfgr - which I could find no where) dyno charts online today after some time looking was HyperTech.
www.hypertech.com
Even then what they had was only a limited number, but I did get real world charts for the stock 4.0, 4.6 and 5.0. (plus they of course showed their performance gains in comparison, which were impressive on the 4.6 and 5.0 and ho hum on the 4.0.)
I found it interesting that the torque curves were relatively flat to "fall off" on the 4.0 and 5.0 starting about about 1500 RPM. The 4.6 was a little more quirky.
The 4.0 seemed to hit peak HP around 4250, the 5.0 around 4000 and the 4.6 around 4750 RPM.
Peak torque for the 4.0 tested was 182 ft lbs at 3000 RPM, for the 5.0 tested was 214 flt lbs at 3250 RPM and for the 4.6 was 223 ft lbs at 3000 RPM. Remember though that if the curve is more or less a flat line, that number is less important than if the curve built up to a peak and then declined afterwards. The 4.6 was a little more "curvy" if you will, still "relatively" flat.
I'm trying to digest all this and work into yet an even more confusing subject to apply it... torque convertors.
There IS one steep curve involved here - the learning curve.
