I have a PacBrake kit and it's one kit $k or 3K you just leave the one spring out for a 3K kit....post a thread in the sponsor forum and they'll PM you some prices.

 

As already stated 4gsk especially with an auto, unless you hold it in gear it will never get near 4k.
Well unless you are going 150 mph LOL
My GSK is a DDP

BTI

 

i have the kit from bd!!!

 

i bought a 3k and i am on the process of returning it for the 4k with 60lb springs

 

No need to return it you can just add the little spring and make it a 4K kit.

 

Make it a 4 k if you are an auto you will need it 3 k's seem to work better in standard trucks 4k all the way> just because it is a 4 k spring doesnt mean you will be getting it up that high in the rpms. its for you auto when it kicks in o/d 3 ks still defuel at 2800rpm 4k will let it go to 3000 rpm with faster response. dont recomend reving it over 3200 on a stock dampener and or without 60lbs springs.

 

4k DDP