What did you do to your NNBS GMT900 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.

Rocket Man

Mark
Supporting Member
Joined
Dec 25, 2014
Posts
26,679
Reaction score
52,949
Location
Oregon
for that center break you could get a piece of rectangular aluminum or mild steel, cut it into (2) 4" strips, drill a hole on each end and use it as a brace for that break right in the center, drill corresponding holes on each side of the break and bolt it on. That will be stronger than trying to bond it back together, which you could apply also with some epoxy.
i'm poor I have always figured out ways to fix things if it is at all possible.
you can do whatever to it right there as nothing will be touching it.
with the inside being curved you could bend a couple washers the same angle and use a couple stand-offs or short sleeves, unless you can round off the bracing metal with some kind of tool for the inside. or just use a couple big bent washers on the inside I don't think it is critical area that will continue to come apart just needs to be braced to keep from wiggling at all.
View attachment 455189
McGyver it!
 

Charlie207

Full Access Member
Joined
Apr 13, 2021
Posts
3,009
Reaction score
5,905
Location
LFOD, New Hampshire
for that center break you could get a piece of rectangular aluminum or mild steel, cut it into (2) 4" strips, drill a hole on each end and use it as a brace for that break right in the center, drill corresponding holes on each side of the break and bolt it on. That will be stronger than trying to bond it back together, which you could apply also with some epoxy.
i'm poor I have always figured out ways to fix things if it is at all possible.
you can do whatever to it right there as nothing will be touching it.
with the inside being curved you could bend a couple washers the same angle and use a couple stand-offs or short sleeves, unless you can round off the bracing metal with some kind of tool for the inside. or just use a couple big bent washers on the inside I don't think it is critical area that will continue to come apart just needs to be braced to keep from wiggling at all.
View attachment 455189

Just get the hot staple kit.
 

RooTBeeRthe1st

Full Access Member
Joined
Jul 11, 2018
Posts
1,226
Reaction score
2,854
for that center break you could get a piece of rectangular aluminum or mild steel, cut it into (2) 4" strips, drill a hole on each end and use it as a brace for that break right in the center, drill corresponding holes on each side of the break and bolt it on. That will be stronger than trying to bond it back together, which you could apply also with some epoxy.
i'm poor I have always figured out ways to fix things if it is at all possible.
you can do whatever to it right there as nothing will be touching it.
with the inside being curved you could bend a couple washers the same angle and use a couple stand-offs or short sleeves, unless you can round off the bracing metal with some kind of tool for the inside. or just use a couple big bent washers on the inside I don't think it is critical area that will continue to come apart just needs to be braced to keep from wiggling at all.
View attachment 455189
Yeah, that's minor. I'm not worried about it. Good idea, I'll come up with something.
 

CMoore711

Full Access Member
Joined
Jul 18, 2017
Posts
1,577
Reaction score
1,503
Picked up some OEM ‘12-‘14 Premium tail lights and purchased an OEM 3rd brake light as well. Had the day off for Good Friday and weather was good so swapped them out.

3rd brake light is retrofitted with LEDs. Turned out great, only gripe is the LEDs in the 3rd brake light don’t seem nearly as bright as the brake lights on the tail lights…

Before:
IMG_6873.jpeg


After:
IMG_6875.jpeg


Night time shot:
IMG_6876.jpeg
 

Geotrash

Dave
Supporting Member
Joined
Feb 16, 2018
Posts
7,845
Reaction score
20,404
Location
Richmond, VA
Finally got the second fan shroud delivered...
This one's covered in mud, but everything looks to be in good shape otherwise. So I'll give it a good wash and put my brand new motors in with my fan blades. Should be all set after that.

So now I have two sets of used motors and blades and pigtails... Technically three sets of motors except one of mine was making bad noises which is why I bought new ones.
I installed a RockAuto aftermarket one in my 2012 last year but it was for the K5L package. It's working great (confirmed with heavy towing last summer) and was brand new. Just something to think about if the muddy one 5hits the bed.
 
Last edited:

Geotrash

Dave
Supporting Member
Joined
Feb 16, 2018
Posts
7,845
Reaction score
20,404
Location
Richmond, VA
Just replaced the original 2008 LY6 TPS with a new AC Delco part. Engine fired right up to a normal idle. Doubt this will resolve my sporadic throttle-lag issue, but at least I got to go outside for a bit.
How are you liking the power and performance of that 6.0 overall, now that you've had it in there a while?
 

Charlie207

Full Access Member
Joined
Apr 13, 2021
Posts
3,009
Reaction score
5,905
Location
LFOD, New Hampshire
How are you liking the power and performance of that 6.0 overall, now that you've had it in there a while?

Overall, I like it. It definitely has move OOMPH than the mechanically stock 5.3 that was in it last summer. It's certainly quicker off the line, especially the odd time I had it in 4WD Hi, and tried a hard-launch. I really try to NOT beat on my DD, but I had to try it once. On the highway, I notice much less downshifting to 5th gear on long hills that would normally require it with the 5.3, but I doubt I gained much fuel economy, especially with the 33" tires. I did notice a slight bump in MPGs when running my winter 31" tires.

I do feel like the email tune has kind of reached it limit to fine-tune the cam and throttle, and basically all other stuff. It's been very helpful to just datalog, and do the email stuff, but I believe there's a level of polish that isn't possible with it. I have been desperately searching for a "local" dyno-tuner who can do LS stuff in person, but the search is not going well.

The other issue is the occasional warm-start/no start scenario. Again, I believe it's a tuning thing that has been mentioned in previous file revisions, but still not worked out.

Mechanically, the engine has been reliable, doesn't leak a drop (yay!), and sounds good. I'm trying to be financially responsible with a long-tube header plan, but adding cats. to the Speed Engineering headers (at least in my BrainCAD v1) seems to be holding me back. If I had a time machine, I would have just burned up a credit card a bit more, and bought them to install when the engine was out, but I was under an extreme time-crunch to get my daily-driver on the road.
 

Geotrash

Dave
Supporting Member
Joined
Feb 16, 2018
Posts
7,845
Reaction score
20,404
Location
Richmond, VA
Overall, I like it. It definitely has move OOMPH than the mechanically stock 5.3 that was in it last summer. It's certainly quicker off the line, especially the odd time I had it in 4WD Hi, and tried a hard-launch. I really try to NOT beat on my DD, but I had to try it once. On the highway, I notice much less downshifting to 5th gear on long hills that would normally require it with the 5.3, but I doubt I gained much fuel economy, especially with the 33" tires. I did notice a slight bump in MPGs when running my winter 31" tires.

I do feel like the email tune has kind of reached it limit to fine-tune the cam and throttle, and basically all other stuff. It's been very helpful to just datalog, and do the email stuff, but I believe there's a level of polish that isn't possible with it. I have been desperately searching for a "local" dyno-tuner who can do LS stuff in person, but the search is not going well.

The other issue is the occasional warm-start/no start scenario. Again, I believe it's a tuning thing that has been mentioned in previous file revisions, but still not worked out.

Mechanically, the engine has been reliable, doesn't leak a drop (yay!), and sounds good. I'm trying to be financially responsible with a long-tube header plan, but adding cats. to the Speed Engineering headers (at least in my BrainCAD v1) seems to be holding me back. If I had a time machine, I would have just burned up a credit card a bit more, and bought them to install when the engine was out, but I was under an extreme time-crunch to get my daily-driver on the road.
Thanks for the details. I'm glad it's working out well overall!
 

Geotrash

Dave
Supporting Member
Joined
Feb 16, 2018
Posts
7,845
Reaction score
20,404
Location
Richmond, VA
I'd honestly love to do another engine rebuild, but don't have anything to put it in. But, before I do that I need a garage & space to work.
Yeah, it was pretty impressive grit to have done that work outdoors and away from where you normally store your tools.

I've had a similar thought - it would be awesome to do a full engine and transmission workup on the bench and have it ready for when one of our Yukons needs it, but I haven't had either the time or the storage space to do so.
 

SpareParts

Elite Member
Supporting Member
Joined
Sep 17, 2023
Posts
2,058
Reaction score
4,661
Location
North Idaho
What door pins/bushings are people using?
I do not see a listing for them on Cunningham Machine and i don't want to install Doorman.
Going on the buddies 2008 Yukon XL.
 

Doubeleive

Wes
Supporting Member
Joined
Nov 7, 2017
Posts
30,563
Reaction score
48,043
Location
Stockton, Ca.
I wouldn't mind the exterior of a escalade, but the interior to me is gaudy and the console is not well designed at all
it's like wearing a ring with a giant stone on it, useless can't get in your pocket, gets caught on everything, ugh
 

Forum statistics

Threads
137,783
Posts
1,992,176
Members
102,777
Latest member
wwiizz
Back
Top