SuperiorRam

so i ordered a sdd3250-6 from SBC on the 29th of June and waited and waited and called the following friday to get a tracking # to see where in the world my clutch was... after telling my name to three people there who are you what did you order... so reordered... mean while the truck is down taking up space at the shop...

the following thursday i opened my box read the instructions quite a few times and did as follows... make sure the clutch disks slide on the input shaft freely (which they did not)

so called Peter at SBC and his customer service was above average and would like to publicly thank him here and now and with his guidance spent some time filing the hubs to get them to slide freely ok so that problem wasn't so big

(anybody ever installed a NV5600 by themselves...)

I'd also like to thank the folks at Zumbrota bearing and gear for their above average customer service... so they told me to take it easy on the tranny for break in time which I did

so after the break in time now 400 miles and counting my $1200 clutch has slipped no less than 15 times under moderate (to my driving capabilities) acceleration losing between 2-400 RPM I called SBC at about 200 miles and he said give it another 150 and it's now at over 200+ (it wasn't Peter I talked to ) I was told maybe I need the 3600lb plate but when I ordered the first time I told the salesman I drive like an idiot my truck makes 480/1038 on an old worn out single disk and I tow also and he suggested the clutch I ordered ya know I spent about $4500 to do it right (so I thought )

This happen to anybody... will it go away... are my flywheels scorched... ya know I also thought my clutch pedal was soft when I first got back in the truck (granted it was ~2.6351 weeks later)
HELP...........

SuperiorRam

Nobody has any help that's a first c-mon this is the place to get all the answers

SnowRider1

Did you get the flywheel machined while it was down? It has been forever since we had a small rig with a manual trans. The others were Petes, KWs, etc. I never had a slippage issue with these, and we always put them to work (78,000lbs +) Yes, they are different, but the people manufacturing the new clutches are probably also making some for larger equipment. And the flywheel machining is necessary ONLY if you have excessive warpage or heat spots. Hope you figure it out.

Brian Lent

A 3250 dd is plenty clutch for 600 hp. Pedal feel should be much stiffer then factory was. I would double check why it isn't clamping right before I drove it. I have never installed one so can't help ya but someone will chime in.

SuperiorRam

thanks y'all new flywheel was included

JFlory

Something is not right somewhere. As stated above, a 3250 is more clutch than is needed for your hp, even if you drive like an idiot. Although, a complete idiot can tear up an iron giant with 100hp.

I know it is a pain, but I would remove the tranny form the truck and double check the whole assembly. If you just happened to put in a disk backwards, it would cause problems you've stated. This sounds stupid and I am sure you double and triple checked that upon install, but I have installed at least 15 DD SBC's and can't believe how easy it is to get one of the clutches backwards.

You should also check to make sure your clutch fork is installed correctly. If you remove the slave cylinder and there is no play(1/4 inch or so) back and forth, then it is not releasing completly.

If you do not find any fault in your doing, then call Peter, agian. He will walk you threw the same process I just did and you will have answers ready. He will make it right with you, that I can be sure of.

gadget.35-06

You said you had issues with tight disc hub splines; did the floater plate slide freely in and out of the lugs on the flywheel?

With the clutch assembled, and ready for the trans, is there clearance between the two disc hubs? If they touch you won't get proper engagement.

SuperiorRam

floater was perfectly machined
i had looked at that also at assembly the fly, disk 1, floater, and disk 2 were all pressed together by the pressure plate then i installed the trans

wmonroe

I would call and talk to Peter. His customer service is excellent and he would know the most about the clutches he builds.
Will

Brian Lent

I've heard something about a washer you have to remove from the input maybe? Can't recall exactly but there was a thread a while back about it.

SuperiorRam

i think we got it.......

mattfolsom

HMM...Thats odd, I have installed many of clutches and dual and single discs, its not hard to be sure its all installed correctly the dics say which end faces the flywheel etc. I have never had that issue....but at the same time I have never dealt with SB clutches either

Brian Lent

Don't keep up us hangin.

metal_miner

I can slip my SBC DD 3250 pretty much at will between 1900 - 2600 rpm. The said clutch has been touted to be conservatively rated at 650 rwHP.

I find that the pedal feel is as light as the stock clutch, definitely lighter than the FE clutch I had a few years ago, and light years lighter than the DD 3850 12 CB I had before the 3250. The 3850 held awesome, but the pressure plate finger broke on it from too much city driving.

mattfolsom

Your 3250 DD slips?