Clutch size

[Ironman03R]

all the 11" kits are for trucks with the 8TH digit of vin is M
12" kits 8th digit is C until 94 where 12 is K and F is 13

Does this sound right?

 

[Diesel JD]

Your truck should be a "K" code engine. The "K" was for a factory turbo IDI in '94 and the F was for a 1st gen PSD. The C likewise was for a factory turbo IDI. I think this info suggests you should use the 12" clutch. The "M" engines were 7.3 N/A IDIs and in case you ever wanted to know "1" was the code for the 6.9.

 

[Agnem]

You won't know until you get in there. The Moose Truck was built with a 12" clutch, but runs an 11" because that's what FoMoCo specified as a replacement part.

 

[7.3shrk]

Is it hard to upgrade from an 11 " to a 12"?

 

[Ironman03R]

Not my truck, friends 90 250. I told him to pull it out first to see what he has, but he found that info on a website for replacement clutches.

 

[ttman4]

When I was poking round getting info for my clutch on my "M" rig, IIRC, Ford had a 12" disc available, but the flywheel had to be designed/sized for 12".....wait a min, that kinda sounds wrong.....don't remember.
Maybe it was upgraded 12" DMF with 12" disc

My original DMF flywheel only would accept an 11" disc though...that I DO remember. I wound up going 12"SMF & disc.
I did find a spring dampened dic at FoMoCo(I like way Mel says FoMoCo instead of Ford...)

Diesel JD...where you guys find all this info for deciphering different codes on such stuff?? IE: what it means.
Clutches, "M, C,K" engines, axles, springs, etc,etc

 

[Diesel JD]

Everything I know I learned here or on the Diesel Stop before many of the good folks left there and came here.

 

[hesutton]

Is it hard to upgrade from an 11 " to a 12"?

Not at all. I got a 12 Kevlar-Metallic from Southbend clutch. Works well. There is a picture of the clutch on th last page of my webshots gallery.

Click Here

Heath

 

[Agnem]

Not hard to upgrade, but technically you should have the flywheel turned due to the rust outside the 11" disc area.

 

[Ironman03R]

So can a 12" clutch be instsalled on a flywheel that had an 11"? I thought they were different?

 

[hesutton]

So can a 12" clutch be instsalled on a flywheel that had an 11"? I thought they were different?

I took the flywheel to a local shop to resurface it like Mel said. Cheap and quick. No need to get a new flywheel for the upgrade. I'm using a 6.9 flywheel behinde my 7.3 with the T19 tranny. It simple bolted right up to the stock flywheel.

Heath

 

[2manydsls]

final answer?

So the holes on the flywheel work with either the 11 or 12 inch pressure plates? Or are there two sets of mounting holes?
Ross

 

[69oiler]

the holes are the same. it's a direct bolt on (at least the LUK 12" clutch i bought was). just make sure you have the flywheel resurfaced.

 

[ttman4]

Your truck should be a "K" code engine. The "K" was for a factory turbo IDI in '94 and the F was for a 1st gen PSD. The C likewise was for a factory turbo IDI. I think this info suggests you should use the 12" clutch. The "M" engines were 7.3 N/A IDIs and in case you ever wanted to know "1" was the code for the 6.9.

Just curious & asking but where is "C" listed somewhere?
Looking at the LMC VIN ID site pg11, I see "1,M,F,K" thru those yrs '83-'96, but no "C"

Ironman;So can a 12" clutch be instsalled on a flywheel that had an 11"? I thought they were different?

Like I say, my '90 had the DMF & it was only drilled for a 11". I don't know about others.
That Dampened disc I mentioned earlier that I found at Ford was a 11"...don't know what else they have.

 

[riotwarrior]

So this is a subject where SiZe does Matter eh