I have a problem and seeings how I just payed alot of money to fix this problem and it didn't don't mine me cause I don't mean to piont fingers and I am not so don't anyone start on SBC but I am having a problem with maybe the slave cyclinder I think. At normal driving and mild power the clutch is great but turn the power up (350-400HP) and the clutch gos bye bye with just the hint of boost. Easier that the OEM:eek: . Now with that being said I don't think that that should be anywhere close to the beaking point of this clutch and neither does Peter at SBC and he said for me to find the problem and he would work with me on the clutch if its fryed. I don't think I fryed it for no more than it slipped before I noticed ( 300-400RPMs) but I know it doesn't take a whole to fry'em. IS there anyway or possibility the slave cyclinder could be holding off some pressure of the pressure plate and if so how and what would I need to do to releive this pressure? Already tryed to releive pressure by taking the line off and letting the pressure off that way and didn't work. Also the clutch petal feels fine and feels just like it did before I did the clutch job. I hate testing to see if the things I try work cause it just slips the clutch more and more. Also does anyone know how muck one costs I think that the local place told me like $250+ for one is that the price or is that high?
:help:

Thanks
Nathan

Well I'm ready to race then, my slipping alli vs your slipping clutch ):h

I've never looked at a ZF6 set up so I can't help much.

did u put in a new flywheel or not?

I payed 150 dollars for one at body shop pricing. Are you sure you didn't put the disc in backwards? Is it the stock pressure plate still or did you get one from south bend. If the press. plate and disc is the same thicknesses as stock stuff clearances shouldn't be a problem.

New flywheel and SBC clutch and pressure plate. Also yes the clutch is faceing the right way. I made sure that it was in the right way.

When u put it in, and tightened the bolts how far away from the flywheel did the disc get tight.
In other words what was the preload on the disc, 1/8", 1/4" or more.

If you've got enough preload on the disc then it would be something in the release/throw out not having enough clearance.

Can u see or feel up inside and see if the throw out bearing is riding on the fingers?

Maybe the set-up u have is too long and there's no clearance between them.

If u have preload and the throw out bearing has clearance the the PP doesn't have enough spring pressure.

I'm on 2nd shift now and w/ the fair starting have been real busy, but I might get some time to look at it and see if we can finger it out.

One way we check the clutch load on the big trucks is push down on the clutch w/ some power on while driving.
See how far u have too push it before it disengages.

If u just touch the pedal and it quites pulling then it's release trouble, if u push it more/long ways then it's preload trouble.

Yeah I just started 2nd on Koko to. Well you know Damn Gm doesn't give you a nice hole to look up there and see anything the only way you can get in there is to pull the trans.:rant: So I can not tell but yes I do work on truck for a living and I understand what you mean as far as the petal very good thinking but the pedal is as same as before about half way down it'll disengage the clutch and not an inch sooner just like with the stock set up. I would say that the preload on the clutch when we torqued it down was at least 1/4" gap. Thanks you for helping but I think I have done and checked out everything I can think of without removal.:( I will have to pull it again when I get back from my trip this coming weekend. I was hoping to have fixed the problem with the clutch but didn't. I'll just turn the power off and drive up there "limp" I just really need my truck now the most. But I don't know how much you can feel though the hydro clutch but it feels just as it always has to me and I pay very close attention to things after I change something to make sure it's right and as far as the pedal everything feels fine. Theres no "dead" spots in it to act as if the slave cyclinder is only moving a short ways instead of the full travel everything feels just like any hydro clutch I have ever drove felt. Think of anything else let me know.:help2:

Thanks
Nathan

Also with all that being said do you think that it would be worth going ahead and paying $200+ for a new slave cyclinder or not? I don't think it feels or sounds like it is a problem with my slave cyclinder. Any more thoughts?

How far do u push the clutch before it disconnects the tranny?

Oh I don't know for sure exact distance but I would say about half way thought the pedal travel or maybe just a hair before half way.

Look 4 posts up I think I told you eveything that I knew about the ?'s you had for me.

I missed it when I read it and saw the 1/4" preload.

Since u have travel in the pedal, I'd say u don't have enough clamping force in the PP.

If it was something w/ the slave cylinder or throw out bearing u would only touch the pedal to get it to release.

Maybe SBC can send u another set up and when u pull it down swap it.

If u get another one or check your current one, put it together on the bench and see exactly how much preload.

Is it diaphram or finger PP?

Does koko have a hydraulic press w/ a pressure gauge?

put a plate over the fingers and see how much pressure it takes to release the clutch , maybe check your stock set up too.

Oh no get this SBC wants me to take out my DMF,clutch, and PP and ship them to them so they can see what the problem is. Is thst a load of BS or what. Its my only transportation. I told him of my testing and checking and he said that didn't matter he still wanted to see the whole set up to see whats wrong. I'm sorry but I think that that is very unproffectional. Do you think I should argue my piont or just give them my stuff. He said he didn't want to start throwing parts at it and I told him I understood that but I couldn't really see what else could cause it other that too little of pressure from the pressure plate.

Oh no get this SBC wants me to take out my DMF,clutch, and PP and ship them to them so they can see what the problem is. Is thst a load of BS or what. Its my only transportation. I told him of my testing and checking and he said that didn't matter he still wanted to see the whole set up to see whats wrong. I'm sorry but I think that that is very unproffectional. Do you think I should argue my piont or just give them my stuff. He said he didn't want to start throwing parts at it and I told him I understood that but I couldn't really see what else could cause it other that too little of pressure from the pressure plate.

They had SD send them some parts to get specs, maybe they have a stock flywheel there.

Have them set up a unit on another flywheel and if it checks out have them send it too u and just swap them when u get it.

If they don't have a flywheel maybe Eric or some one else around there area can get them one to set u up a good unit.

Will they do the labor if u drive it up there to their shop?
Maybe worth a day off to see if they can fix it.

New flywheel and SBC clutch and pressure plate. Also yes the clutch is faceing the right way. I made sure that it was in the right way.

the clutch plate cannot be put in backwards. You would not be able to bolt the pressure plate to the flywheel if you did.