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

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treehan77

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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

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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

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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

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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

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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

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Well, I'm not sure since your year uses different switches. Hopefully others with the early NBSes will chime in.
 

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