who has one and wat do you think? worth the money? what it do exactley? increase power in the rpms so it revs out more?

 

Some say its great and other say it's no better than the 3K GSK. It depends what you use your truck for.If you do any sled pulling or drag racing the 4K would more likely be worth it, If you use your truck as a daily driver and only haul a trailer here and there the 3K will suffice. One thing is that with the 4K, you will need the 60lb valve springs.

 

Yep. It allows fueling that you can actually feel in the higher rpm range.
X2 on what BigDiesel359 said.

I purchased the 4k and will use the 3k portion until I install the 60lb springs then I will probably install the the remaining springs for a 4k gov.

got mine from mightydiesel.com Hope this is ok to put on here if not moderators please remove this last statement.

 

i thought they had the 3000 stock in them?

 

the 4000gsk is amazing it brings your truck to life.. but it would be a good idea to get 60lb valve springs if you get them

 

Nope.
I have seen 2650 rpms's pulling a trailer when 5th gear came off and I ran 4th gear on a 4hour trip home but it was defueling some. With the 3k and 4k the truck is still pulling very srtong and well with no defueling.

 

wat do you mean defueling?

 

The motor is only allowed to rev up to a certain RPM underload or driving power which is different from from revving the motor in neutral or park.


Maybe this link will help out and give a better explaination.
GSK Clarification - Competition Diesel.Com - Bringing The BEST Together

 

you do not need the 60lb valve springs when running the 4k kit. i ran for over 2 years with stock valve springs with the 4k kit. they are recomended if you turn more than 3200 rpm wich i never did i did the springs because of the exhast break

 

If you never go above 3200 anyway, IMO the extra $10 or whatever for the 4K doesn't even make sense. If your not going to use it, you don't need to spend the money on it.