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Nothing. The Torque shift in the 08's has been beefed up from the factory for the 6.4L and can handle the 500RWHP easily. The tranny needs to learn driving styles and needs to be hammered on every few days if not more. Otherwise you might get a little hiccup in shifting, but no damage is being done with the Spartan tunes. Will it shorten the life of the tranny, probally. So far I haven't heard of one rebuild or grenade from the power Spartan is throwing down, or SCT. Heck, the truck Spartan is using has over 100 dyno pulls and driven everyday brutally. They have Suncoast tranny parts waiting to be installed, but haven't needed it yet.
The GM Allisons can't claim that.
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2008 F-250 Lariat 4x4, 6.4L, 4 tires, brakes, windshield, windshield wipers, tailgate, bumpers, blinkers, headlights, spare tire, rear bumper, hood, antenna, driver AND passenger seats, speedometer, radio, steering wheel, & spare set of keys!
Last edited by RDG; 11-18-2008 at 05:19 PM.
Reason: Laguage
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