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

[iamdub]

Uploaded the latest tune changes to enable the alcohol content sensor and TCC tweak, then took it to bring Kin out for Taco Tuesday. I'm happy to see that it immediately began reading much more accurately. Before, it was calculating anywhere from 7% to 20% or more low. Now, it's staying around 1% to 2% high as compared to the fuel/water test tube. The TCC tweak seems to not have done much, maybe a harder launch. I couldn't test it much today.

 

[Doubeleive]

I think and hope it uses a standard size, cuz I bought one with 6,000 miles on it after they accepted my offer of $110 on their original price of $135. It has the clutch on it and I'm gonna roll with it. With my engine spinning 6,000+ RPM then the trans upshifting fairly quickly and firmly, it just makes sense. Even if it's a wear item, I should be good for a long time. The alt is essentially new and I don't drive much at all.




A circuit is only as good as it's weakest link. Upgrading just the alternator to battery positive won't do anything if the battery negative to engine (alternator grounds through case>bracket>engine) isn't upgraded equally or larger. Or, if the battery negative goes to the frame, then there needs to be an equal engine-to-frame cable, making it a Big Three.

I think the clutch pulley is wider, I guess you will let us know

 

[Geotrash]

Took the ‘07 to the local lube shop to have the transmission fluid exchanged. Not a good idea. Before I could stop him the tech dumped a can of quick flush of some sort down the dipstick tube and proceeded to let it idle while he readied his fluid exchange machine.

Before I let them touch it I asked the shop owner what kind of fluid they were going to use. He said Pennzoil (they’re a Pennzoil shop) Dexron 6. But when I asked the tech what Pennzoil fluid he used after he was done he said it wasn’t Pennzoil, and said it was a Global something or other synthetic, compatible with “most” transmissions.

Sigh. Should I get that shit out of there or let it ride? Never again will I use that shop.

 

[swathdiver]

The TCC tweak seems to not have done much, maybe a harder launch. I couldn't test it much today.

Test-N-Tune coming up! Let's see some before and after timeslips!

Took the ‘07 to the local lube shop to have the transmission fluid exchanged. Not a good idea. Before I could stop him the tech dumped a can of quick flush of some sort down the dipstick tube...

How did she drive afterwards?

 

[Charlie207]

I hear ya. I really didn't like the fake chrome stuff either.
About the only thing left for me are the door guards / trim with that shiny plastic junk. Not sure what to do with those.

For the life of me I can't get the chrome covers off. I watched a video from 1A Auto that shows the tech struggling with a small flatblade screwdriver, popping the tabs loose on the cover. But, it's way harder than it looks. I must be missing something, or am dumb.

 

[Geotrash]

Did some more reading about the "global" fluid the shop used. General consensus is that it's really good stuff. Full synthetic that exceeds the Dexron VI requirements. Last time I had it done was at a Valvoline shop the used the Maxlife which is the same type of broad compatibility synthetic fluid. Not gonna worry about it but wish they hadn't used a can of "flush". Oh well.

In the next 2 months we have 6500 miles of trips planned with it so just gonna roll with it! Columbus, Cleveland, Denver, Nashville - all on separate trips.

 

[89Suburban]

But if you spread the weight out few bags on the pass side floor

Did some more reading about the "global" fluid the shop used. General consensus is that it's really good stuff. Full synthetic that exceeds the Dexron VI requirements. Last time I had it done was at a Valvoline shop the used the Maxlife which is the same type of broad compatibility synthetic fluid. Not gonna worry about it but wish they hadn't used a can of "flush". Oh well.

In the next 2 months we have 6500 miles of trips planned with it so just gonna roll with it! Columbus, Cleveland, Denver, Nashville - all on separate trips.

Does that ass another wrinkle to the puckered butt driving now?

 

[pwtr02ss]

I think I will either use the trailer or make two 840# trips.

2610 lbs in the bed of the avalanche. It was supposed to be 1800lbs. When Steph got there, they told her they made an error. She went with it. I about fell over when she sent me the pic. Shocks only aired it up about 2"

Dont be skeeered

After she got home and it had aired up (only about 6 mile drive)

 

[pwtr02ss]

The TCC tweak seems to not have done much, maybe a harder launch. I couldn't test it much today.

That only made my converter feel "tighter". Drivability was much improved.

 

[mikez71]

The only made my converter feel "tighter". Drivability was much improved.

What is this TCC tweak? Is it to zero the slip?
I've heard that helps with reliability, but am afraid to adjust the pressures without knowing exactly where and how much...

 

[RooTBeeRthe1st]

What is this TCC tweak? Is it to zero the slip?
I've heard that helps with reliability, but am afraid to adjust the pressures without knowing exactly where and how much...

I've noticed mine slips 5-10 while steady state cruising, flat ground, highway.

Honestly can't remember what all I changed and to what in HPT.

 

[mikez71]

Stock slip tables are set to 20. I've heard it can't hold 0 slip without pressure increase.
I've disabled TCC except for 5 and 6.. thinking about adding it back to 4th.

 

[Fubar0715]

2610 lbs in the bed of the avalanche. It was supposed to be 1800lbs. When Steph got there, they told her they made an error. She went with it. I about fell over when she sent me the pic. Shocks only aired it up about 2"

Dont be skeeered

View attachment 398270
After she got home and it had aired up (only about 6 mile drive)

View attachment 398271

Rented a bobcat/skidsteer many moons ago and wanted to save a few bucks by picking up. Borrowed my buddy's car trailer and off I went with my NBS Tahoe...bad idea. The front end felt "light" and it was squatted for sure...damn thing weighed about 8k lbs. We used my buddy's F350 to take it back!

 

[pwtr02ss]

What is this TCC tweak? Is it to zero the slip?
I've heard that helps with reliability, but am afraid to adjust the pressures without knowing exactly where and how much...

We have aftermarket higher stall torque converters. Not stock. It was one little misstep in the overall changes for the converter.

 

[Sam Harris]

We have aftermarket higher stall torque converters. Not stock.

Details… please.

 

[pwtr02ss]

Details… please.

I was editing my message when you replied. Please see above.

 

[mikez71]

We have aftermarket higher stall torque converters. Not stock. It was one little misstep in the overall changes for the converter.

Ah, gotcha. Thanks. I better stick with stock settings, it's held up for this long and I like not feeling the engagement.

 

[RooTBeeRthe1st]

We have aftermarket higher stall torque converters. Not stock. It was one little misstep in the overall changes for the converter.

Yeah, when I eventually pull the engine and trans, still debating on how high of a converter I want. Honestly probably going to stick with 1,800 to 2,000. But no more than 2500 for my application.
That's just going to hurt my mileage and whatnot and all the traffic I do daily having a real high stall.

 

[RooTBeeRthe1st]

Ah, gotcha. Thanks. I better stick with stock settings, it's held up for this long and I like not feeling the engagement.

There are actually so many settings, you can have it hold really tight but still have it engaged and disengage smoothly.

 

[mikez71]

There are actually so many settings

That's why I'm scared! I'm having a time just doing the shift schedules.. dialing in my mild tune, definitely worth it.. but it's a process
Any disadvantage to disabling tcc lower gears? I figure I'm not cruising speed yet and would save the tcc from constantly engaging/disengaging.. though I'm sure it helps mileage..