First things first

[Thirsty]

Recommendations to new gmt400 truck owners. Basic maintence/upgrades/mods

 

[Jesse_Wenting]

Hello there fellow canuck. Some preventative maintenance you should probably consider is changing your fluids. All of them; engine oil and filter, transmission fluid and filter, differential fluid, coolant, power steering for the ***** and gigs. Don't worry about brake fluid, you'll be servicing the brakes soon enough lol.

If you're mechanically inclined, take a look behind your wheels. See what shape your drums and calibers are in. Look for rust on the rear shocks and their mounts, inside the wheel wells, rockers (feel for expansion at the pinch welds), under the carpet if you can especially by the front passenger (be careful taking the doorsill plates off and replace all the screws with stainless steel screws), around your skid plates if you have them, and on your torsion bars.

I could go on but those are the most common issues in with the weather we go through. I'm in southern Ontario though so I deal with salt in the winter too.

 

[RawbDidIt]

Fuel system and vacuum check, if you have a scan tool, may as well throw it on there and check fuel trims to get ahead of any issues that may be creeping up.

Pull plugs and rotor cap to check for fouling.

Find a parking lot, and test the ABS if equipped.

Steering components, particularly the rag joint.

Anything that doesn't feel quite right, just search around for, one of us has probably had the problem before.

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[Thirsty]

Appreciate the help, looks like this forum will be a great asset

 

[Thirsty]

What oil are you guys running in these big units

 

[smdk2500]

What oil are you guys running in these big units

What engine? 4.3 5.0 5.7 6.5 7.4? When I was driving my gasser 95 daily I just bought the cheapest 5w-30 I could get. It goes through a qt every 500ish miles. My 6.5 I run mobil 15w40.

 

[RawbDidIt]

I run 5w40 on mine, I've got low oil pressure, so it's good for an extra 2-5 psi. Full synthetic. I'll put it back at 5w30 when I rebuild unless I see the oil pressure drop in the summer.

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[Pinger]

What oil are you guys running in these big units

Fill yer boots.
https://www.gmt400.com/threads/conventional-vs-synthetic-oil-debate.50618/

Appreciate the help, looks like this forum will be a great asset

It is.

Anything that doesn't feel quite right, just search around for, one of us has probably had the problem before.

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Exactly what that man said!

 

[PlayingWithTBI]

Yeah, don't ask what kind of oil you use, ha ha. There was another thread asking what oil you use about 6 months ago too.

Oh, and

 

[Erik the Awful]

I put 10w30 in mine after the rebuild, but my oil pressure is high, so first oil change I'll probably switch down to 5w20. All my cars run 5w20.