guesstimating HP to pick the right clutch? - Ford Powerstroke Diesel Forum
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Old 07-10-2014, 07:16 AM
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guesstimating HP to pick the right clutch?

I recently put in new 160/30 injectors with appropriate tunes.
under hard acceleration in my higher gears, the clutch will slip.

Is there a way to estimate my HP, so that I can pick the correct clutch?

Any brand recommendations or brands to steer clear of?

Late 99 7.3, ZF6 manual F250 4x4
~280,000 miles......only a handful of mods...
160/30 single shots (powerstruck tunes)
PHP HYDRA
WW2 wheel on the stock turbo
boost fooler
4" turbo back exhaust
bellowed up pipes
HP oil crossover
Riff Raff FRX
Air Raid cold air intake
CCV mod
T500 HPOP
Boost/EGT/Fuel Pressure gauges
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Old 07-10-2014, 07:53 AM
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350-400 range
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Old 07-10-2014, 08:03 AM
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I like my South Bend. I got one rated up to 450 and it shifts nice and the clutch pedal feels great.

Upgrade your clutch fork when your in there. If you have the stock one it will break eventually due to a stronger clutch.
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Old 07-10-2014, 08:20 AM
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Do your research before you finally decide what clutch you want. I can't remember which clutch I have but it's so stiff that my leg gets worn out in traffic and it's very grabby. It has hardly any slip to it and trying to back a trailer is very difficult. Go with valiar or south bend. I recommend calling and talking with either company and ask questions and tell them what you use your truck for and what you want out of the clutch.
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Old 07-10-2014, 03:27 PM
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Thank you for the feedback,
Seems like some more research and a few phone calls are in order.


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Old 07-11-2014, 11:02 AM
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Any opinions/feedback on the southbend 1939-DF kit?

I have a lathe, so I can turn my flywheel, I do know I need a new ring gear.
(I have a "bad spot" on it somewhere, occasionally the Stratford grinds, if I rock the truck in gear, it fires right up)


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Old 07-11-2014, 12:45 PM
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If you have a stock clutch in it now it has a dual mass flywheel and you should replace with a single mass flywheel. South Bend will sell kits with everything you need.

Not sure the South Bend would even bolt up to a stock flywheel but i have never tried...
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Old 07-11-2014, 12:49 PM
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Previous owner had the clutch replaced, but I have no idea what they put in,and I'm guessing there is no way to tell without pulling it.


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Old 07-11-2014, 02:49 PM
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No not really, pulling the inspection plate is almost worthless, you cant hardly see anything but might be able to feel what is in there but i cant describe to you what the differences would be.

Id be willing to bet that if the previous owner had it replaced he had it replaced with a stock clutch. Stock ones will last a good 200K if not abused so id assume yours isnt weak it just cant handle the new power. But ive been wrong before.

Real hard to tell whats goin on in there without pullin the tranny.
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Old 07-11-2014, 02:52 PM
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Quote:
Originally Posted by CarportMechanic View Post
No not really, pulling the inspection plate is almost worthless, you cant hardly see anything but might be able to feel what is in there but i cant describe to you what the differences would be.

Id be willing to bet that if the previous owner had it replaced he had it replaced with a stock clutch. Stock ones will last a good 200K if not abused so id assume yours isnt weak it just cant handle the new power. But ive been wrong before.

Real hard to tell whats goin on in there without pullin the tranny.
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