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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 652491, member: 8143"] You can kill a stock 5r with big tunes and air......... if you absolutely rape your trans. I have a stock trans in my shortbed dually that runs h&s hd300 24/7/365. I drive the ***k out of my truck. It will smoke all four duals at 30 mph rolling. I hold nothing back when driving that truck, that why i have it. I have nothing special in it besides air mods. It has made 56psi of boost and the trans still goes strong. Needless to say. A good built and tuned 5r will run circles around the 4r for the money. The 4r still breaks at the same power levels that 5r will. The shafts in the 4r and planetaries still have limits on power. Both trans hard parts will hold way more than you are planning on putting out. The tuning for you truck with a 5r can be had from basically any custom tuner with no special effort. There are really very few people running a 4r in comparison to running built 5r transmissions in 6.4 trucks. And unless you plan on 1000hp and nitrous a 5r will handle anything you put on it. [/QUOTE]

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