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

[pwtr02ss]

Noticed a whirling sound on the Avalanche. Sounds like maybe the AC compressor? Its around 1200-1500 RPM and then either the engine noise drowns it out or it goes away. I'll need to do some more investigating when it warms up.

 

[07Burb]

Check your diff fluid, mine just took a dump.

She's only got 64,000 miles on her. Her diff fluid should be so fresh you could drink it

 

[07Burb]

Noticed a whirling sound on the Avalanche. Sounds like maybe the AC compressor? Its around 1200-1500 RPM and then either the engine noise drains it out or it goes away. I'll need to do some more investigating when it warms up.

turbos?

 

[pwtr02ss]

turbos?

Sadly, no

 

[Just Fishing]

Got my new transmission pump cover yesterday.
Located my old transgo shiftkit that I installed when i first got the hoe.
That kit has some pump upgrades!

Fully dissembled the pump valving and cleaned first.
Didn't notice that the pump stator seals on the updated version that i have, well it has Orings behind the seals to prevent leakage and shift issues!
(side note: this pump version also addresses a 2-3 shift flare that units built before December 2008 may have, my transmission should be one of those)

Used carb cleaner spray to really break up the packing gunk, then rinsed with brake cleaner.
then i saw those Orings were already starting to swell from the carb cleaner.

Luckly the pump kit came with an extra set.

Installed my new transgo boost valve kit.
It also happens to address an issue where there can be "run-away pressure" due to worn parts.
That prevents the classic cracked clutch drum that will leave you with a no drive, no reverse, and if minor, delayed reverse and shift flare/delay condition.

That issue drum is right behind the pump
So, i might yank it to give it a good go over while everything is apart...
But if this thing is on its side, then i might have issues getting the spines to align with the clutches for reinstall.

for sure I'm going through it if i end up just pulling the transmission...


Now I'm just waiting on the bell/pump housing so i can get some measurements and get a pump rotor kit and slide ordered.

I'll get some pictures and toss them up on my build thread once i have the pump housing in hand.

 

[gpracer1]

Noticed a whirling sound on the Avalanche. Sounds like maybe the AC compressor? Its around 1200-1500 RPM and then either the engine noise drowns it out or it goes away. I'll need to do some more investigating when it warms up.

While replacing my water pump and radiator last week I just happened to spin the tensioner while I had it in my hand…..glad I did. Sounded so dry and rough I bet it would have failed in a few thousand miles. Easy to check!!

 

[pwtr02ss]

While replacing my water pump and radiator last week I just happened to spin the tensioner while I had it in my hand…..glad I did. Sounded so dry and rough I bet it would have failed in a few thousand miles. Easy to check!!

Everything on the front of the engine is new OEM, Gm stuff. Everything was replaced 6k miles ago while I had the engine out. It could be a tensioner but it sounds like it's on the passenger side

 

[Just Fishing]

Dicked around with the tahoe for a moment today.
Been wanting to try disconnecting the TV screen in the back to see if it helps my rear speaker issue.
Disconnected, and my rear speakers are back!!

damn thing has been rattling anyways.

on the to-do list once i have the other major issues sorted.
With the rear speakers working, it's waaay down below the "replace seat cushion foam" task.

 

[Sobro]

LOL, wth is wrong with a TV screen that it can kill the rear speakers?

 

[gooffeyguy]

LOL, wth is wrong with a TV screen that it can kill the rear speakers?

Thinking that it's on maybe?

I do know that if the rear seat passengers plug in headphones it disables rear speakers or if the rear entertainment screen is on and I'm still listening to music up front the music only come out the front speakers