What did you do to your NBS GMT800 Tahoe/Yukon Today?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

treehan77

TYF Fiend
Joined
Feb 1, 2015
Posts
1,394
Reaction score
1,132
Location
Crestview, FL
So yes. I inspected the rear main seal via the peep hole on bell housing and cover looked clean. Rear main seal looked OK. What prompted me to do the job was the top of the bell housing was covered in oil and no way that's happening unless coming from the top. I only did the knock sensors and all those gaskets because I wasn't taking all that off and half assing the job. Valley pan gasket, grommets all got replaced. My friend and I were both shocked at how clean the engine was. No gunk or buildup on heads or area under valley pan. I've had rig for 3+ years now, so I'm not sure of previous owners maintenance.
Did that stop your leak? I have all those parts on my bench for when I get a chance…
 

blueinkd

Full Access Member
Joined
Nov 21, 2017
Posts
621
Reaction score
1,486
Did that stop your leak? I have all those parts on my bench for when I get a chance…

I haven't had a chance to get under it. The drip pan I had it parked over seems to be staying dry. Perhaps it resolved 70% of the leak. I plan to spray the underside with purple power decreaser and hose it off at the carwash this weekend to verify
 

915_Tahoe

Your GM Parts Specialist
Joined
Jul 1, 2018
Posts
1,333
Reaction score
1,851
Location
HELL PASO, TX
Is the yellow light on the 2wd button supposed to be on during the day. I only just noticed this cause the back light was not working so I replaced the 4x4 switch. The yellow light lights up when the lights are on in the night,, but during the day the 2wd light does not turn on. Can anyone confirm if it should be lite during the day.

20210304_182006.jpg
 

Fless

Staff member
Super Moderator
Joined
Apr 2, 2017
Posts
10,252
Reaction score
20,311
Location
Elev 5,280
Is the yellow light on the 2wd button supposed to be on during the day. I only just noticed this cause the back light was not working so I replaced the 4x4 switch. The yellow light lights up when the lights are on in the night,, but during the day the 2wd light does not turn on. Can anyone confirm if it should be lite during the day.

View attachment 272551

One of the mode indicator lights is on all the time (with ignition on) on my '04. I would think yours would be the same.
 

915_Tahoe

Your GM Parts Specialist
Joined
Jul 1, 2018
Posts
1,333
Reaction score
1,851
Location
HELL PASO, TX
One of the mode indicator lights is on all the time (with ignition on) on my '04. I would think yours would be the same.
Well the 4x4 switch does flash when starting the vehicle then stop. But when I do turn on the parking lights the back light turns on aswell as the 2wd yellow light.
 

Fless

Staff member
Super Moderator
Joined
Apr 2, 2017
Posts
10,252
Reaction score
20,311
Location
Elev 5,280
Well, I'm not sure since your year uses different switches. Hopefully others with the early NBSes will chime in.
 

Forum statistics

Threads
128,802
Posts
1,805,638
Members
91,785
Latest member
Eliteweapons
Top