Which clutch?

[Matrix37495]

I was looking at RockAuto's offerings and didn't know if i need the 11" or 12" clutch. Can i run a 12" if i have an 11" now?

6.9L flywheel with a T-19....

 

[91idi]

Nope, different fly wheels. If I were you I'd want to resurface the fly wheel to save the new clutch. Measure it while its out. Most trucks had the 11" btw

 

[Dave Barbieri]

For your trucks, the 12" upgrade is a direct bolt-in replacement. I did it 6 years ago, and have just installed a new clutch setup on my fresh rebuild. While you're replacing the clutch, check out the Kevlar pilot bushing from South Bend Clutch.

http://www.southbendclutch.com/kevlarbushing.html

Definitely an improvement!

 

[Matrix37495]

Wayne, I'm going to get it resurfaced if i can find a shop to do it, but i'm going to replace the clutch cause i only want to do this job once.

Dave, I would have thought a needle bearing would be better than a bushing. How does that work?

 

[firehawk]

Wayne, I'm going to get it resurfaced if i can find a shop to do it, but i'm going to replace the clutch cause i only want to do this job once.

Dave, I would have thought a needle bearing would be better than a bushing. How does that work?

The bushing is stronger. A needle bearing can be damaged during installation and you won't know it until its all together. I use bushings in all my cars, even if they came with a needle bearing. The only time they spin is when the clutch is pushed in.

 

[Silver Burner]

Definitely do a resurface. It's really cheap anyway. I had the one on my old 6.9 done for 35 bucks.

 

[Matrix37495]

So what's the final answer on the clutch size?

 

[91idi]

Most came with 11". You can get a 12" up grade.

 

[Matrix37495]

Make up your mind Wayne... ;p

Guess i'll order the 12" and hope it fits...

 

[91idi]

I don't wana!

 

[RLDSL]

So what's the final answer on the clutch size?

You can go 12 or even 12 1/4" (which is generally a redrilled 12" to fit the 12 1/4 but gives a little more surface area ) if you go to a SMF with the larger discs, you end up getting basically as many dampening springs as you had with the DMF so essentially no rollover noise, where an 11in in a smf has only 4 springs in the hub, and reusing an old DMF is playing with fire. Definitely get the lkevlar pilot bushing, trouble free operation * if installed properly*

 

[91idi]

You can go 12 or even 12 1/4" (which is generally a redrilled 12" to fit the 12 1/4 but gives a little more surface area ) if you go to a SMF with the larger discs, you end up getting basically as many dampening springs as you had with the DMF so essentially no rollover noise, where an 11in in a smf has only 4 springs in the hub, and reusing an old DMF is playing with fire. Definitely get the lkevlar pilot bushing, trouble free operation * if installed properly*

He has a 4 speed. Already smf.

 

[dizdak]

following this thread cause i too need to replace my clutch soon, and want to get a good one.. but i am running a 7.3... my clutch was supposedly pretty fresh when i got the truck but now with all new injectors and a baby moose i think the clutch is letting some power fail me when towing.... i want a clutch that is direct bolt on, no mods needed, and will hold like a sumagun when pulling..