CK5
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noJeeps 2001 duramax Frank - new headlights

I knew that would come up...

Yup, highway 35 between Francis and Tabiona, summit is around 9,500 feet.
 
Bit of an update:

Just rolled over 6,000 trouble free miles since purchase, time for an oil change. Got 12 quarts of Mobil1 full synthetic for $75, a wix oil filter, a wix air filter and a can of seafoam. I haven't changed the oil yet, but I tried an experiment, before replacing the air filter, I ran the truck though a 0-60 run without a filter, just to see what difference it made.

Quite a bit it turns out. Given the intense maintenance regime the previous owner kept to, it's a safe bet the air filter that was in there was at least 8 years old, and even though I blasted it with some compressed air, the little vacuum indicator would always be maxed out, even if I never went to full boost since the last time I checked it. Also, when I planted the go pedal, the boost would always taper off near redline. Without a filter, it held at 20 psi all the way to 3200 rpm. With a new air filter, it did the same thing, and the truck is more responsive and feels more powerful all around.

One thing I did find out, when running without a filter, is that I can hear the turbo much better with an open intake, so a quality intake is on the list of upgrades. Because turbo noises are cool :pimp:
 
You can remove the part of the intake that has 6.6L on it and replace it with a 2” plug to give you more noise on the cheap. Pretty sure it’s called the turbo resonator.

I would do this and keep the stock filter for reasons we’ve already been over.
 
The drilled air box is/was a very common mod for more air flow and letting out any water ingested, but tended to dirty filters faster due to changed inlet. Don't use foam, use good AC delco paper filters. Every objective test ever performed has shown no appreciable improvement even with fresh perfect oiling, and reduction in flows otherwise, plus MUCH higher abrasive silicates allowed into the intake, not to mention potential oil fouling of the sensor.
Forgot about this conversation...
 
After having driven this in the snow for several days I can positively say this truck does not have any kind of traction adding differential in the rear axle. Which is annoying and should be changed.
 
Mine has the G80, which in these massive AM axles is actually quite good. Some find it to be somewhat violent engaging, but mine with 33" tires has been quite well mannered in mud, gravel, ice, and snow. If you are open to that option, they should be readily available as I think they are pretty common in the 4x4s.
 
After having driven this in the snow for several days I can positively say this truck does not have any kind of traction adding differential in the rear axle. Which is annoying and should be changed.

Mine has the G80, which in these massive AM axles is actually quite good. Some find it to be somewhat violent engaging, but mine with 33" tires has been quite well mannered in mud, gravel, ice, and snow. If you are open to that option, they should be readily available as I think they are pretty common in the 4x4s.

Are you sure you were driving right to engage a G80 properly? They don't just start working like a regular clutch type unit. You have to have steady tire spin below 35mph (depends on vehicle and tire size but I think that's what GM rates it at) to engage it.

But if you don't, we just put a Truetrak in a buddy's 4x4 E350 and he LOVES it in the snow. They were up in the mountains at a ski resort last weekend and he was telling me how good it did for them.
 
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