Can we talk about hitting 600 horsepower on a stock block 5.0?

I finally strapped my 2018 F150 to the dyno after throwing on a Whipple kit and some long tubes. Figured I'd be lucky to see 550, but it laid down 602 at the wheels. That caught me off guard because everything I read said the Coyote block taps out around 580. Now I'm worried about the transmission holding up, the 10R80 isn't exactly known for handling that kind of abuse. Any of you guys running big power on a stock trans? How long before I start looking at a rebuild?

3 comments

3 Comments

adams.spencer21d ago

Your numbers sound nice on paper but 602 at the wheels on a Whipple setup means you're probably around 680-700 at the crank on a stock bottom end. That's pushing it way past what the Coyote block was designed for in these trucks. The 10R80 is actually the bigger worry, those things start slipping around 550 wheel torque if you're flooring it a lot. I'd get it tuned conservatively or start saving for a built motor and trans. There's a reason Ford stopped at 580 on their own builds and didn't go higher.

the_holly20d ago

Ran my 2018 5.0 with basically the same setup for about 18 months before the 10R80 started acting up. First sign was a weird 2-3 shift flare that only happened when I romped on it from a dead stop. I kept thinking it was just the tune being aggressive, but nope, torque converter started slipping bad around 560 wheel torque. My buddy had his trans rebuilt by a shop that does exotics, cost him like 8 grand but he swears it's bulletproof now. Honestly, if you're gonna keep pushing it, I'd start setting money aside for a built unit sooner than later. I learned the hard way and ended up stranded on the highway with a trans that just gave up completely.

dakotawood21d ago

Man that's wild, I ran a similar setup on my 2020 and was shocked when it held together too. Just make sure your tuner pulls timing in the midrange where those 10R80s usually start slipping.

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