cuts out after 3000RPMS???
 

will free rev only to 3500rpms and when you rev her out in low lock she cuts out like crazy. springs are way tighter than what spec calls for. ive checked them and they are in there right. truck drives good and all but when you go to get routy it just doesnt have the a$$ i think it should.

do i need more fuel? DV's? filters are new and clean

I think it has to be in the gov spring assembly, not needing more fuel. My truck has about the same mods as yours, and revs to 3500 with no problem in gear, and revs to the same without load with no problem as well, I just have never gone higher by choice.

im thinking about shimming the little spring out a little bit to see if that changes anything? and ive heard of guys going over 4000 with these springs. how tight do you have yours set?

Re: cuts out after 3000RPMS???
 

Sounds like the springs are to loose

wouldnt that be nice. they are cranked so far down im afraid if i go any farther i might break one of the ears of the clicker nut thingy.

Im not sure how tight they are set, they were already installed on the pump when I bought it.

Re: cuts out after 3000RPMS???
 

If you have them that tight without adverse reactions it makes me think your spring pack if the wrong height or spring rate. Possibly a governor assembly issue outside the spring pack.

ive thought the same thing. they are peak springs installation went just fine but if you set the keeper to .050 or whatever spec is the truck wont rev passt 1500 rpms.that is why they are cranked down so far.

Almost sounds like a spring or shim is missing... Did the springs come with a modified base to go in with them? My PacBrake 4KGSK came with a modified spring base to replace the stock base and shims. I tightened mine down to the stock stem spec and mine free revs just barely up to 4000 rpm. Is the kit maybe missing a spring during installation? I think one of the stock springs gets reused, or it did in my kit... :humm:

ya they came wwith new bases there are 3 stock shims that dont get reused the largest spring is the idle spring and it gets reused. im stumpped?

u 100% sure u didnt get shipped a 3k gsk? i also have a pacbrake 4k and it revs to 3500 rpm easy with no load and about 3000 in gear when im jumping on it because the trans shifts. i dont remember reusing any of the factory springs though:humm:

if i remember right (its been a few months) i have a little stiff spring a pretty stiff bigger spring and the stock idle spring i do very much believe EVERY spring kit utilizes the factor idle spring for drivability reasons. (which is the big outer spring) and i am for positive i have a 4K spring kit. no binding everything went together flawless. what else could it be?

Re: cuts out after 3000RPMS???
 

Buy a new kit and install it, set protrusion at .50 from washer top to stud top or .120 from grove to stud top. You obviously have a spring pack issue if the shims are installed correctly and the idle springs were not removed and reinstalled without the shims. What is the height of each spring?
Is everything else up to par? Fuel pressure and such

ya the truck is up to par and runs great the way it is just a far cry from 4k and there were no shims that went with this kit. and i have to take the pump apart to measure them. do you think i could shim the little spring out a pit to pick up some rpms?

Re: cuts out after 3000RPMS???
 

You could shim but it can make tuning them in core correctly a real pita. I install 4 or 5 kits a week and have never had issues with trucks that were stock, but have had issues with pumps that had been shimmed or had the washer mod installed. Hence why I recommend not installing washers. All but the idle springs are replaced, and in 4k kits you install the smallest inner spring. Some pumps had different configurations of springs, mores-so pumps that had governor replacements or had been to the pump shop. Is there a chance you accidently reused your inner springs instead of the springs with the kit

no sir, iverything was put together just like the instructions said not problems at all. but set to .050 on stem height the truck wouldnt rev past 1500ish? and i have bunches of the stem prodruding now. this truck has never had the pump off of it and was babied before i got it. it has VERY low unmolested miles

take it back apart... USE NO SHIMS start with nothing in the pump install you factory (largest) idle spring and then you largest spring that came with 4k gsk then the middle spring then the smallest... then tighted down your nut till u feel 4 clicks... bar engine over and repeat... call me with any ?s 1 620 277 8992

im prolly gann be taking it apart agin this weekend and see whats going on. thanks