The Fat Girl 86', C30, 3+3, dually, bagged, SFBDed on 22.5"s

i just knew there was sumtin that would crossfit to any cummins from a big rig type diesel , i bet the compressor will last longer than a rebuild aircon pump too
bet there be a couple guys running to the wreckingyard now to score one for their own dually

As long as they know the ramifications. You'll loose your vac pump, you'll need the PS pump from the big truck as well. Then you need to dig into the relief valve on the pump to try and turn it down. Mine was 150bar (2100psi) from the factory. Our trucks run 1100-1300psi from the factory. I have mine turned down but I'll have to adjust it once I have her running again. I turned it WAY down just to be safe. I still have to fab a reservoir and convert my pressure line to the hydro boost to a -06JIC (AN) line. Teeing in the coolant lines has been a bigger pain then I expected. I have the factory coolant lines for the compressor but the industrial block must be different because they don't point to coolant ports on my block. I should just run copper lines and be done with it. Then there's the intake side. They tap into the intake on the industrial applications. I guess boost is the 1st stage of the compressor

darn its never simple isnt it
maibe you need to enlange the bleedoff to make it go down that mush
maibe you find the t's you need for the hydraulics at a shop that does earthmovers and stuff like that these usually use billet blocks drilled and tapped from different sides , they might have the solution for youre pressure problem too so you can keep the pump stock (eazier to repair on the road)

Wow what a week. My goal was to take a spin on Sunday and I ended up getting there but what a battle. After giving up on hard lines for the coolant to the air compressor I plumbed it with rubber lines only to find out the head had gotten water in it at one time. It froze and cracked the coolant passage. After tearing the head off the compressor, drilling out the ends of the crack, grooving it out, and TIGing it back up I was ready to try it again.


No more coolant leak but the power steering pump was pegging the 3000psi gauge I put in to check my modified relief. It settled down after working the air out so I tried a couple more bumps over relief... it was still way up and after the second bump spiked the gauge the end cap on the steering box blew apart like a shotgun!


The Hybrid turbo was the easy part...

All in all I got to drive her again Sunday night. Man did it feel good. My B-day wish came true.

Aye carumba! Murphy's law was not happy with you this weekend. If it could go wrong... However if you are like me I don't take no lip off old Murphy, and I know how to smack that one around to get him back in line! That is what they taught us in bigger hammer school!

just read back thru your build thread.....truck is looking sweet....are you still using the hand clutch? are you planning on ever putting a foot clutch in it?

Do you remember what shock you used on the front end?

Thanks! This Sunday was actually the 1st drive with the foot clutch in it. It was really nice I thought I had a Hyd in my old plow truck but it ended up being a mechanical so I made up some linkage and that's what I'm running.

Just some Jeep wrangler take offs I had in the shop from doing someone's lift. The front rims rub the shock mounting bolts so it's on the list to either cut holes in my uppers and run them thru there or make some tubular uppers. At this point whichever is easier. I hope to get to that this weekend.

A little update, I hacked and wired in a DRAC module the other night to try and get the speedo to work. I'll see if it works the next time I drive it. I should have a GM 40 tooth tone ring but the Eaton trans only has a 16 tooth. While I was in the wiring mood I reworked my switch panel. The line lock was on a toggle switch to be used as a park brake. That made burnouts kind of hectic so I added a momentary to it as well. Since I tied my rear bag together I eliminated the second bag switch and added an auto switch. I'll be installing a ride height control valve to the rear. The auto switch will switch between the raise and lower solenoids and the auto height control valve.

Since I had to cut my switch box off the trans tunnel and I have the foot clutch in I started to cover my trans. The sound of an open floor and a Cummins is deafening. It's rough but it's a start... I forgot a shifter hole:)