What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[gooffeyguy]

Can someone please share with me the tq specs for the exhaust manifolds on the 5.3 (12)? Gotta get these shorties sealed up.View attachment 377144

What manifolds did you get?

 

[Drwinlied]

I went with the jba's silver ceramic coated. Fit and finish not great, the welds are not what I would call professional quality. We'll see how they hold up.

But new plugs, wires, injectors, and manifolds has the tahoe running strong again.

 

[Amaster]

Installed cabin air filter kit yes I needed it simple procedure.

 

[RooTBeeRthe1st]

Finally put the lubelocker gasket on the 14bolt to replace the new and failed felpro I had on there.
Topped it off with amsoil.
No puddles under it this morning.

Needs a wash and check the oil level before I put a few hundred miles on it this weekend.

 

[Drwinlied]

Installed cabin air filter kit yes I needed it simple procedure.

This reminds me I need to help my stepdaughter replace hers in her mazda3. Fcker reeks and has since we bought it (very used )

 

[Doubeleive]

I thought it was 18 on 2nd but spooked myself and went a bit lower. Thank u

I would get some locking bolts they always came loose on me part of the reason I stopped using headers, that and I would crack them

 

[gooffeyguy]

Why do aftermarket header/bolts loosen but not factory?

Things that make you go hmmm

 

[Doubeleive]

Why do aftermarket header/bolts loosen but not factory?

Things that make you go hmmm

Because they have a smaller bolt head surface area so less contact to keep it in place, less metal coverage overall so more prone to heat/cold expansion, they make locking ones I have seen them or pictures of them anyway

 

[gooffeyguy]

Because they have a smaller bolt head surface area so less contact to keep it in place, less metal coverage overall so more prone to heat/cold expansion, they make locking ones I have seen them or pictures of them anyway

I've used locking ones before with aftermarket headers, just didn't know why OE bolts didn't loosen. Them having bigger heads make sense.

I installed Stage8 one's that have a tab then a C clip that holds the tab into position, but they're really a pain in the ass and hope you don't lose the C clip.

I then switched to some Breslin Split Locks which I like and are easier. The threaded part is split and there is a set screw in the center of the head that spreads the split part slightly after installing. I think the patent is expired now and other brands make them, like Summit, Mr Gasket, and Percy's.

 

[gooffeyguy]

Planning on changing out the front and rear differential fluid. Manual says they both take synthetic 75w90 gear oil. Says nothing about limited slip modifier so I was going to get the Mobil Delvac with no additive.

Also doesn't give me a capacity and researching online I've found 2.75qts rear and 1.8qts front. Is this about right, even for the Denali with AWD? I was going to buy 5qts. Will that be enough or way too much?