Stock zf6 clutch limits

bigaF250 · Jan 31, 2013

Just bought a 04 6.0 with the zf6. Before I go throwing parts at this thing, what kind of horsepower can the stock clutch handle.

SICKS LITER · Jan 31, 2013

where it will slip is in the meat of the torque curve, 1500-2500rpm +/-. maybe 100ft lbs over stock.

bigaF250 · Jan 31, 2013

Dam thats it? Lol I was hoping for a little more closer to 400hp

sonic_superduty · Jan 31, 2013

Stock power..... they don't seem to like too much extra in my experience

02BigD · Jan 31, 2013

Basic chip from 2006 on the 7.3 when it was a manual, would cause the stock clutch to slip, greater than 3/4 throttle. Couldn't have been any more than 240 or so to the wheels.

bigaF250 · Jan 31, 2013

Wow alright thanks guys. I guess a south bend dd will go on the list as well

colinmitchell111 · Jan 31, 2013

What's the limits of the zf6 itself? With a good clutch of course

Purdue_stroker · Feb 3, 2013

Mine lasted 40,000 miles while tuned with alot of towing and hardly ever slipped! The the throw out bearing went bye bye

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Purdue_stroker · Feb 3, 2013

colinmitchell111 said:
What's the limits of the zf6 itself? With a good clutch of course

With my sb 3600 I'm putting down over 600hp probably with no problems

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bigaF250 · Feb 12, 2013

Thanks purdue. Good to know I can at least put a tuner to it

Scott@All Pro Diesel · Feb 12, 2013

Dan at Midwest trans was 800+ with his old 6.0 and didn't have any trouble with his ZF that I can recall.

reilly8282 · Feb 12, 2013

I hate to throw this off topic but while all the 6.0 guys with zf-6's are here. What fluids are you running? How many quarts will it take. Thanks

Mdub707 · Feb 12, 2013

I asked the same question (what will it hold) for a buddy of mine that had bought an 06 6.0 with the ZF6. Everyone told me they were slipping the clutch in 100 miles with Innovatives Extreme tuning. He ended up ordering it anyways and said he'd just get a clutch if/when it slipped. That was like 3 years ago and when he sold it over the summer it was still holding up just fine, but I wouldn't count on it. Sounds like aggressive tuning will cause them to slip, though that wasn't our experience.

bigaF250 · Feb 12, 2013

I'm thinking that the clutch in the 7.3 zf6 and the 6.0 are different cause that is where I have seen the mix up. But I'm going at it like your buddy did. If it slips I'll throw a clutch at it

HaysKSFirefighter · Feb 12, 2013

Mine will slip in the race tune or when towing heavy. I've got a SB single in my garage waiting to go in. I put amsoil manual trans lube in mine and I'm quite pleased. It runs real smooth with that. My throw out bearing is shot though after 30k tunes miles with quite a bit of towing. Clutch is still kicking though.

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Purdue_stroker · Feb 12, 2013

HaysKSFirefighter said:
Mine will slip in the race tune or when towing heavy. I've got a SB single in my garage waiting to go in. I put amsoil manual trans lube in mine and I'm quite pleased. It runs real smooth with that. My throw out bearing is shot though after 30k tunes miles with quite a bit of towing. Clutch is still kicking though.

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That's what happened to mine. The clutch was still holding strong with 110,000 miles on the truck 30-40k tuned. And the throw out bearing went out. I went ahead and threw a dual disc in it then since I was gonna have it out. 160k on the truck pushin 600-650hp and the DD hasn't slipped once. Even hooked to a sled

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Donovan · Feb 19, 2013

I have the stock clutch in my truck and I have an intake, full exhaust and run the extreme race tune from innocative diesel and my clutch has only slipped on me one time. My roommate runs the same set up and he had to replace his clutch almost immediately after putting the tune on his truck. I honestly think it all just depends on the condition the stock clutch is in whenever you decide to go throwing parts at it.

bigaF250 · Apr 18, 2013

Bringing back a dead horse here but finally grabbed a tuner and played with the truck. I see a clutch in the near future. It does fine from a rolling start but slipped in almost every gear from a dig and slammin gears hard. This clutch hates me haha. Waitin for it to go boom so I have an excuse to pull the cab and have some fun

nasty6.6 · Apr 18, 2013

So i read this thread last night and I was like damn my clutch has held up pretty good. Headed to a job this morning and getting on the loop i put it in forth and give it a little gas, then the rpms jump from 1300 to 3000 in 1/2 a second... Looks like i shouldnt read these threads lol