I have a off topic question , is it possible to put 2nd gen brake calipers on a 3rd gen to fit 15" wheels?
I'm sort of in the same boat with a 2wd. I ended up putting 2nd gen brakes on the rear so I could fit a 15 inch wheel and slicks for the track. However, I've seen a 3rd gen truck with the M&H drag radial, the big 390 tire, mounted on a widened stock aluminum wheel. It was widened towards the inside so it didn't stick out but had a wide beefy tire on it, looked really good and those drag radials work too. Something to think about.
On edit, how do you like the 3.40 gear?