Join Date: Nov 2011
Location: Moyock, North Carolina
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Unless the trans has been religiously maintained, and I mean religious at every 30k or less, I wouldn't do a flush. Every reputable shop I've spoken to about trans rebuilding says no flushes. I would however drop the pan to inspect it, then do a 08/09/10 pan and filter. Read up on that, lots of info on here about it. The early trucks, 03-08.5 didn't have much of a filter in the trans pan, just a screen really, they had a bypass style filter up by the bumper, it filters great, but its only bypass filter meaning it won't filter all the fluid every pass.
Honestly if you're attempting to approach 500hp at the wheels, I'd be planning on a upgraded trans eventually, especially if you're going to take it to the track. I was right around that power level, albeit on fluid that had probably never been changed at 150k miles, combined with tuning that had questionable shifting and it smoked the torque converter clutches and direct clutches. Maybe just my dumb luck, I know there's lots of folks around 500+ on stock trans, but eventually you hear of them addressing the trans.
I'd also recommend a coolant flush, and switch over to elc coolant. It won't gum up and clog up the oil cooler as bad as the ford gold coolant, though without the egr system it should be less of a problem.
As for tuning, Eric or bill at php are well represented here, I've spoken with both of them, very intelligent guys, though I've never run their ecm tunes. I do run a php ficm tuner, I like it, makes a difference for sure, but anything over the atlas 80 is really hot really fast. I would also consider matt at gearhead automotive, no relation to me or my username, just a coincidence. He's also a smart guy. Back ground in engineering...that's who's tunes I have waiting to load into truck as soon as I get my transmission back.
Actually breaking 500 to the ground is harder than people make it sound...is also consider a ported intake manifold, that helps egt's tremendously even on stock trucks. People talk about the blue spring upgrade, honestly I would just build my own regulated return setup for not too too much more in retrospect.
Good luck, and welcome...this is a really good resource to learn about your truck.
2005 F-250 Harley Davidson Edition
Warren 205/75 Injectors
KC Turbo 71mm VGT
Twisted Diesel Level 3 Transmission/PI Converter
AFE Intercooler/Flexalite Fans/Mishimoto Radiator
Icon 4 Link, 37" Nitto's
SSBC 6 piston calipers
Yukon 4.30's, Detroit Locker
Machining the 6.0: