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Clutch Options

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amish77
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Clutch Options

Post #1 by amish77 » Tue Mar 12, 2019 8:47 pm

Fellas I have a bit of a dilemma. After 10 years of hard service behind a moderately warmed up 300I6 my clutch has gotten warped and now bounces the truck quite violently upon engagement. I'm sure it had nothing to do with the aggressive driving or other shenanigans that I did with it along the way. The clutch that I'm looking to replace is a Hayes super-truck 11" spec'd for high loads, towing, and increased power. Hayes doesn't make that clutch anymore. After poking around the inter-webs I've found a zoom clutch at summit that looks like it will work, but I'm not familiar with zoom and don't want to buy something that will have a crib death. I'm leery of using a stock replacement because this is a moderately warmed over engine. It's anecdotal but I did torque the pinion of a dana 44 in half with this setup. I'd rather not be going back after this in 2 years because the stock replacement 11" gave up, but maybe the Hayes sucked and all i had was a stock 11" clutch. What are your opinions? Is there something else out there that will work?

Thanks in advance for any consideration you may have.

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THE FRENCHTOWN FLYER
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Re: Clutch Options

Post #2 by THE FRENCHTOWN FLYER » Tue Mar 12, 2019 9:49 pm

Is there any oil in the bellhousing area on the outside of the truck? If there is a rear main seal leak or leak past the crank flange bolts that is a quick way to ruin a clutch assembly due to oil contamination.

I'd trust tha OEM clutch, it is probably the same basic unit used on the big V8 (with minor spring tuning of course).
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

Wesman07
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Re: Clutch Options

Post #3 by Wesman07 » Tue Mar 12, 2019 10:41 pm

Good point FTF.

I had a similar clutch issue, where every 11” clutch Id try would have a heavy chatter within a few thousand miles. New fly wheels, resurfacing new flywheels, nothing would help. Until I tried the Brog Warner 11” clutch, which also had a significantly lighter pedal.

Is it possible that a clutch too aggressive will warp a flywheel faster than a standard duty?

Don’t forget to look at motor mounts and u joints while your at it.
In-lines we trust

86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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GPGoverMPG
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Re: Clutch Options

Post #4 by GPGoverMPG » Wed Mar 13, 2019 7:38 am

I'm very interested in this clutch thing as well. I should be making good power and torque when my motor is done. Playing in the mud and trying to keep wheel speed can make for aggressive shifts and the big tire np435 combo can make street driving hard on the clutch. I have used Zoom racing parts in the past with good results on my Mopars just not they're clutches. I've looked at Centerforce and several others just don't know which to go. I normally run automatics as they seem to be easier on equipment. Sure would like to know what clutch combo is giving the best service.
71 F350 4x4 Super Duty 7.3 IDI
72 F250 4x4 4speed 300 I6
72 F100 2x 428 Tri Power
2014 SHO

jason832
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Re: Clutch Options

Post #5 by jason832 » Wed Mar 13, 2019 8:29 am

A stock 11 inch is fine for me. Never even resurfaced the flywheel and threw a used disc on....
Street demon carb, Clifford intake, 268 comp cam, headers, exhaust. Mine doesn't seem like its even close to slipping and I've never had and shaking or noise or anything. I imagine it would take a lot more torque to overpower it, we aren't making big block numbers....

Phase3
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Re: Clutch Options

Post #6 by Phase3 » Wed Mar 13, 2019 9:07 am

The mustang 11 inch clutches will work if they are from a tremec year mustang. My truck has one from an 06 gt and the pedal is very light but the clutch holds great. Only fades at peak boost in 4th gear sometimes. Other times it holds on fine


Edit 9/5/19: just found out new information in regards to mustang clutch. The center of some of these clutch disks are about 1.5 inches rounder. I found the springs will run into the 300 flywheel before the friction material. Some of these disks will not work for this reason unless maybe the flywheel recess is machined out larger.
Last edited by Phase3 on Thu Sep 05, 2019 1:38 pm, edited 1 time in total.
1996 f150 turbo 4.9 OBD2 M5OD 4x4 12 lbs on 93
1997 f350 351w cclb

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THE FRENCHTOWN FLYER
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Re: Clutch Options

Post #7 by THE FRENCHTOWN FLYER » Wed Mar 13, 2019 9:48 am

The Mustang clutch increases clamping force as RPMs go up. So that gives a light pedal for light driving and lots of clamping force for hi-RPM launches. So it seems logical to me that with high boost at low revs you could momentarily overpower it with the turbo.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

guhfluh
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Re: Clutch Options

Post #8 by guhfluh » Thu Mar 14, 2019 1:21 pm

From what I remember, a late model F250 or F150 11" diaphragm should work fine and have a better pedal than an earlier finger style.

I swapped my 11" finger style for a newer diaphragm style 10" looking for less chatter. I still have chatter, but the 10" still holds the heck I put it through. It's close to being overpowered, but it does hold and has been holding for a long time.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

sdiesel
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Re: Clutch Options

Post #9 by sdiesel » Thu Mar 14, 2019 7:53 pm

I like the Mustang principle that seems rational.
furthermore with the ford truck, and the firewall issues due to pedal stiffness, I believe I should purchase that fo my f350.
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

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