I'm using a Dana 44. It had 3.31 gears before, but its got 3.55's now. The 3.31 is too tall for a 28" tire, at least on my car.What rear you runnin? And what gear?
I'd consider my car a long way from being "new tech" the only aftermarket engine parts are the pistons and camshaft. Ran 10.3 on an "old school" cast wheel CPT66. Still has stock rockers and valves. Stock throttle body/doghouse. Stock crank/rods. Stock ecm. Stock location IC. 200-4r. Stock k-member/ control arms, no fiberglass parts. I don't think I used any parts that weren't around 10-15 years ago, or were factory stuff.