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

[iamdub]

Took Kin to get her nails done for homecoming tonight. Some spirited city driving ensued. After dropping her off, I tested for sustained high load and RPM. Again, all seems normal so I'm gonna call it good. I might have hit a new speed record but I can only guess the actual speed. 5,700 RPM, 3rd gear (1:1), 3.73 rear gear and 31.9" tire calculate to 145MPH. But it's not quite that due to the converter slip. Should be right around 135, though. Judging by the needle's movement up to 120 and the time following, maybe it is closer to 140ish.

What y'all think?

 

[89Suburban]

Took Kin to get her nails done for homecoming tonight. Some spirited city driving ensued. After dropping her off, I tested for sustained high load and RPM. Again, all seems normal so I'm gonna call it good. I might have hit a new speed record but I can only guess the actual speed. 5,700 RPM, 3rd gear (1:1), 3.73 rear gear and 31.9" tire calculate to 145MPH. But it's not quite that due to the converter slip. Should be right around 135, though. Judging by the needle's movement up to 120 and the time following, maybe it is closer to 140ish.

What y'all think?

I'm speechless. LOL

 

[Just Fishing]

Took Kin to get her nails done for homecoming tonight. Some spirited city driving ensued. After dropping her off, I tested for sustained high load and RPM. Again, all seems normal so I'm gonna call it good. I might have hit a new speed record but I can only guess the actual speed. 5,700 RPM, 3rd gear (1:1), 3.73 rear gear and 31.9" tire calculate to 145MPH. But it's not quite that due to the converter slip. Should be right around 135, though. Judging by the needle's movement up to 120 and the time following, maybe it is closer to 140ish.

What y'all think?

I feel ya on the PTSD.



I'm still getting some valve train rattles with my setup, but I'm not going to worry about it until I get around to swapping those lifters for the different lower oiling version.
"High RPM" double valve springs have their negatives for sure.

At least I know the valve springs were very well-oiled during break-in

 

[iamdub]

I'm speechless. LOL

Ya know... I probably shouldn't be doing this on them old tires. I'm gonna see if I can get my 22s refinished and installed before the trip.

 

[Just Fishing]

Ya know... I probably shouldn't be doing this on them old tires. I'm gonna see if I can get my 22s refinished and installed before the trip.

How old are those tires?
dry rot?
easy to spin on dry pavement?

 

[Doubeleive]

Took Kin to get her nails done for homecoming tonight. Some spirited city driving ensued. After dropping her off, I tested for sustained high load and RPM. Again, all seems normal so I'm gonna call it good. I might have hit a new speed record but I can only guess the actual speed. 5,700 RPM, 3rd gear (1:1), 3.73 rear gear and 31.9" tire calculate to 145MPH. But it's not quite that due to the converter slip. Should be right around 135, though. Judging by the needle's movement up to 120 and the time following, maybe it is closer to 140ish.

What y'all think?

maybe, the most I could ever get any of my 5.3's and 4 speed's up to was 137, the Nali I have had up to 142 and she still had a pinch more but ran out of runway one of these days maybe out in the desert I can try again, wind resistance is a factor
you can throw a little portable gps on the dash and the trip computer will give you a more accurate number

 

[Kapitein]

Changed the EVAP purge solenoid and vent solenoid on my 07 Burb. P0449 CEL for the vent solenoid, bit decided to change both just to be sure.

Once I had the vent solenoid off from the car, the reason became quickly obvious.

30minute repair and cheap too. No more CEL!!

 

[mikeyss]

I like you guys a lot, but come on..... Driving 120+ in these heavy rigs, is not cool at all. What happens when you kill someone else on the road doing stuff like this? There are proper places and proper vehicles to do this kind of thing. Highways where my family, and friends drive is just unacceptable. Please be safe and try to think of the other people you are endangering.

 

[iamdub]

How old are those tires?
dry rot?

Probably too old to be doing this. Not dry rotted, though.

easy to spin on dry pavement?

Kinda! I left this note at my buddy's house that I had stopped by to visit but he wasn't home.

 

[iamdub]

maybe, the most I could ever get any of my 5.3's and 4 speed's up to was 137, the Nali I have had up to 142 and she still had a pinch more but ran out of runway one of these days maybe out in the desert I can try again, wind resistance is a factor
you can throw a little portable gps on the dash and the trip computer will give you a more accurate number
View attachment 383502

A GPS or even a speedo app on my phone. But these things are always unplanned. LOL

I merged onto the road (you can see the signal arrow flashes in the vid) and it was clear so I just stayed in it.