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Message: <blockquote data-quote="INW-Iron-Steel" data-source="post: 28582" data-attributes="member: 11733">Turbo. That's it. The 5.3 and 6.0 have the same stroke length. That is why the 5.3 works OK in a heavy vehicle and the 4.8 is pretty much worthless for doing real work (4.8 van with a trailer is downright pathetic).In my opinion, you over-cammed the 4.8 for your application. That 212/218 cam shifts the torque curve on a 5.3; the torque loss down low will be worse on the 4.8. If you want to keep that cam and not go forced induction, put a converter in it so you can get into the powerband quicker (2500RPM and up). This comes with drawbacks mentioned above. 4.56s with 33s are a bit much in something you intend to drive regularly. 285/70/17s are 32.7" and I don't consider that a particularly large tire. If it were me, I'd put a different cam in it. Cheaper and easier than a converter or gears. Take a look at Cam Motion. Their stage 2 cams are much tamer, especially for the 4.8 (202/206 @ .050). The Cam Motion 5.3 stage 1 (200/204) Summit Torkinator (200/205) and BTR Torque (202/202) would be good alternatives that will make low speed torque. With that last one, single pattern cams have a history of being able to make slightly better low speed torque. FWIW, my 4.8 won't spin the 285/60/18s with a limited slip... unless the road is wet.</blockquote>