Yet another GMC build

[dsraven]

start with a good power wash.
also, before installation, flush out the cooler lines and replace the cooler.all that stuff is stuck in that old cooler. some will put a filter inline but I am not on that side of the fence, personally. I have seen a hydraulic shop flush new lines and then blow a plug down the line with compressed air to clear any solvent from the line and see if the plug comes out clean or if the line needs more flushing. they use what looks like a roll up ear plug.

[dsraven]

I have also seen a cut away of a previously flushed plate style trans cooler. it still had lots of debris in the plates. a new cooler is cheap insurance.

[dsraven]

you're gonna be soooo tired of ATF soon.

[OKGMC4]

Took the trans apart and all the frictions and steels looked perfect so put them back in. The only damage found was a chewed up converter snout, the stator bushing was banged up, and the front seal came out in little pieces. I replaced the bad parts and put it back in and it’s been driving perfect for almost 200 miles now. Not really sure why it blew the front seal out in the first place. The bad news is I’m not 100 percent thrilled with the 5.3 power. Seems to have about what my cammed 6.0 had naturally aspirated. Not bad, but I ain’t scared yet. Thinking of gapping the 6.0 rings and swapping it. More cubes, little more compression, more cam, and more boost should thoroughly scare / thrill me.

[OKGMC4]

I pulled the heads off the 6.0 and regapped the rings. I changed the Texas Speed 224R out for a mild custom turbo grind from Cam motion. I changed the wastegate springs for 12lbs. Pulled the 5.3 and pushed in the 6.0. The idle needed raised from 650 to 750 and I think I need to lean the idle out a little below 13.6 where the tuner set it. But the power so far is ridiculous. I only pushed it to half throttle and it’s walking sideways while still accelerating and shifting. I believe I finally have the scary power I’ve always wanted. Need to look into wider stickier tires now.

[6DoF]

[Kevin_C]

Looking great! I saw this video the other day and thought of your truck. I was a bit surprised by his current brake and suspension set up.

https://www.youtube.com/watch?v=nf1MItkMMKM

[OKGMC4]

Originally Posted by Kevin_C

Looking great! I saw this video the other day and thought of your truck. I was a bit surprised by his current brake and suspension set up.

https://www.youtube.com/watch?v=nf1MItkMMKM

Man that thing is a beast!

[OKGMC4]

Really wanted to make sure my tune was safe for the engine so I had it dyno tuned this morning. The verdict…
605 hp
656 ft lbs.
I think it has more than enough power now. My poor 275/40zr18 tires agree. I had backed down to 10lb wastegate springs because I was afraid to lean out up top. I’d rather give up some power than burn it up at 12lbs boost.

[6DoF]

haha, yeah, the makings of a tire smoke show