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

[swathdiver]

Rebuilding the rear diff, (8.6")

Seems that 14-19 inch pounds of pinion preload is what's documented, and there's a few articles showing 15-30.

I can't tell if that's a revised figure, or maybe pinion with carrier preload.

It's all back together and I had 18 inch pounds of pinion, and about 25-27 ish total of pinion and carrier with the 3.42 ratio so all should be in spec.

There are specs for a new preload and one for after seal replacement which is about 3-5 pound higher.

 

[George B]

I put in 27.2 gallons it was 3.99 per, which is a dollar or more less than 92 is right now
might be like drinking water just so you feel full, lol

Filled up with E85 this morning.

 

[Geotrash]

Filled up with E85 this morning.

View attachment 406226

Geez...at only 107K you don't even have that truck broken in yet!

 

[George B]

Geez...at only 107K you don't even have that truck broken in yet!

65k when I bought it.

 

[Doubeleive]

mine was at 82k when I bought it and now it is at 162k, new crate motor at 84k, both diff's rebuilt at 84k, trans rebuilt at 120k
only thing not done is the transfer case which is suspect at the moment.

 

[wjburken]

Bought ours in June of 2019 with 85K on it. It has 160K on it now. Did have to replace some lifters a while back at around 130K I think it was.

 

[Doubeleive]

Bought ours in June of 2019 with 85K on it. It has 160K on it now. Did have to replace some lifters a while back at around 130K I think it was.

did you do them? or had them done? what was the cost?

 

[wjburken]

did you do them? or had them done? what was the cost?

I did not. Needed it done sooner than I could. Had the local dealer do passenger side lifters and an engine mount and total was $1800 for all of it.

UPDATE:

Got the vehicle back from Rotman's in Maquoketa, IA on Saturday. Final bill for passenger side lifters and associated consumables and gaskets, along with replacing the driver's side motor mount, taxes and shop supplies was just under $1800.00. That also included a free loaner car to use while it was in the shop.

 

[iamdub]

I just asked for pics.

Pics he sent were of both spoilers, but they were covered in dust. He says the paint is great. I'm gonna have to go see them in person. I'll wash 'em off to get the real story on the paint. One has a chunk missing from the red lens and the other looks like it might have a star crack. At the least, they're candidates for the Eagle Eyes light conversion. I'll have to negotiate the price after seeing them personally.

 

[mikeyss]

What did I do to my GMT900 today (well on Tuesday)... Got it towed away for a transmission rebuild. I missed the call from the shop today, but it seems the pump and torque converter are the cause of failure, but they didn't say where all the fluid was pouring out. I had a circle d converter in it, so I'm anxious to see what happened to it when I speak to them tomorrow. Estimate is looking like $7k plus, but this is considering the HD parts going back inside it.

 

[Geotrash]

What did I do to my GMT900 today (well on Tuesday)... Got it towed away for a transmission rebuild. I missed the call from the shop today, but it seems the pump and torque converter are the cause of failure, but they didn't say where all the fluid was pouring out. I had a circle d converter in it, so I'm anxious to see what happened to it when I speak to them tomorrow. Estimate is looking like $7k plus, but this is considering the HD parts going back inside it.

Bummer. I’ll also be interested to hear what you find with the converter.

 

[j91z28d1]

ouch.

 

[Doubeleive]

What did I do to my GMT900 today (well on Tuesday)... Got it towed away for a transmission rebuild. I missed the call from the shop today, but it seems the pump and torque converter are the cause of failure, but they didn't say where all the fluid was pouring out. I had a circle d converter in it, so I'm anxious to see what happened to it when I speak to them tomorrow. Estimate is looking like $7k plus, but this is considering the HD parts going back inside it.

is that the beverly hills shop? holy crap, had mine rebuilt for 500hp and all the fixes it was $4000 w/100k 3yr warranty, maybe I got good deal.....
I even made it perfeclty clear I intended to boost it, so I wanted it built right

 

[the_tool_man]

is that the beverly hills shop? holy crap, had mine rebuilt for 500hp and all the fixes it was $4000 w/100k 3yr warranty, maybe I got good deal.....
I even made it perfeclty clear I intended to boost it, so I wanted it built right

When my OEM stock (BB tuned) tranny failed earlier this year, I was in the middle of moving and needed my Yukon back ASAP. My only viable option was to install a GM-built HD transmission, as the local dealer had one in stock and couldn't get a non-HD one for weeks. That was $4200. By the time I paid labor, replaced the radiator (for trans cooler) and cooler lines, and change the fluid in the TC and diffs, it was about $6k total.

 

[m1dn]

Truck has been running rough on cold start for about a minute or less for a while now, didn’t pay much attention to it.

Now yesterday it got rougher and didn’t go away, then got bad in drive around 1-1.2k rpm.
Finally engine light popped up for few seconds and i was able to read it as cylinder 2 misfire.

Swapped wires, still cylinder 2.
Spark plugs are less than a year old, maybe 10k miles tops, NGK TR5.
Took out the plug and it looked fine, clean!

Replaced single plug with NGK TR5IX, runs smooth again and no rough idle on cold.
Never seen a single plug go bad!

Also got a top engine cleaner just in case, might run it over the weekend

 

[the_tool_man]

Truck has been running rough on cold start for about a minute or less for a while now, didn’t pay much attention to it.

Now yesterday it got rougher and didn’t go away, then got bad in drive around 1-1.2k rpm.
Finally engine light popped up for few seconds and i was able to read it as cylinder 2 misfire.

Swapped wires, still cylinder 2.
Spark plugs are less than a year old, maybe 10k miles tops, NGK TR5.
Took out the plug and it looked fine, clean!

Replaced single plug with NGK TR5IX, runs smooth again and no rough idle on cold.
Never seen a single plug go bad!

Also got a top engine cleaner just in case, might run it over the weekend

Man, I'd be sweating if that had happened to me. I read over and over about a misfire code being indicative of a lifter failure! I'm glad it was just a plug. Why NGK and not ACDelco? I'm asking because I just swapped mine and went with OEM.

 

[Geotrash]

Truck has been running rough on cold start for about a minute or less for a while now, didn’t pay much attention to it.

Now yesterday it got rougher and didn’t go away, then got bad in drive around 1-1.2k rpm.
Finally engine light popped up for few seconds and i was able to read it as cylinder 2 misfire.

Swapped wires, still cylinder 2.
Spark plugs are less than a year old, maybe 10k miles tops, NGK TR5.
Took out the plug and it looked fine, clean!

Replaced single plug with NGK TR5IX, runs smooth again and no rough idle on cold.
Never seen a single plug go bad!

Also got a top engine cleaner just in case, might run it over the weekend

It's possible that the plug got dropped somewhere along the way, which can lead to micro-cracks in the insulator. When that happens, they will start misfiring eventually.

 

[m1dn]

Man, I'd be sweating if that had happened to me. I read over and over about a misfire code being indicative of a lifter failure! I'm glad it was just a plug. Why NGK and not ACDelco? I'm asking because I just swapped mine and went with OEM.

No OEM in Canadian Tire, didn’t want to wait tbh

 

[mikeyss]

is that the beverly hills shop? holy crap, had mine rebuilt for 500hp and all the fixes it was $4000 w/100k 3yr warranty, maybe I got good deal.....
I even made it perfeclty clear I intended to boost it, so I wanted it built right

How long ago was this? In today's economy, everything seems to cost way more, lol

I feel the pricing for mine is on point, I am getting a billet reinforced rear planet, billet 4-5-6 hub, 6 pinion input planet, new billet converter, new steels and clutches, brand new bell housing and pump, etc.

 

[Doug118]

Finally getting the ball rolling on the iPad 12.9 setup. The old 9.7” just wasn’t cutting it for me anymore. Old setup is for sale btw