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

[swathdiver]

the Top speed for the Tahoe hybrid is 147MPH

As alluded to earlier, the limitation on top speed with these trucks is not their engine or gearing, it's the driveshafts. Must be a pretty stout propeller to spin a Tahoe to 147 mph. Is that theoretical or a confirmed, actual, top speed?

 

[BG1988]

As alluded to earlier, the limitation on top speed with these trucks is not their engine or gearing, it's the driveshafts. Must be a pretty stout propeller to spin a Tahoe to 147 mph. Is that theoretical or a confirmed, actual, top speed?

theor. without speed governor... i'm sure it could do it since the PPV has 5.3 top speed is 139MPH

hybrid has 6.0L plus a bonus 80hp


2008
5.3L 320 horsepower (238 kW) and 335 lb.-ft. of torque (452 Nm)
6.0L 379 horsepower (278 kW) and 472 lb.-ft of torque (640 N⋅m) combined output

 

[swathdiver]

theor. without speed governor... i'm sure it could do it since the PPV has 5.3 top speed is 139MPH

And 6.2s are even more powerful but the driveshaft limits their top speed. Do you know what their specifications are? Tube length, thickness and diameter? U-joint size? Do the 2WD models run AXN 9.5" semi-floater rear axles?

 

[BG1988]

And 6.2s are even more powerful but the driveshaft limits their top speed. Do you know what their specifications are? Tube length, thickness and diameter? U-joint size? Do the 2WD models run AXN 9.5" semi-floater rear axles?

i'm sure it's very strong i can feel the front end lift up like it's going to do a back flip if I "take off"

 

[Rocket Man]

i'm sure it's very strong i can feel the front end lift up like it's going to do a back flip if I "take off"

You just need rear shocks.

 

[Tonyrodz]

You just need rear shocks.

Lol

 

[Doubeleive]

i'm curious about this driveshaft thing, I have only taken mine up to 132 but I know it has more I just didn't have more runway, my nbs would do 136-137

 

[Tonyrodz]

i'm curious about this driveshaft thing, I have only taken mine up to 132 but I know it has more I just didn't have more runway, my nbs would do 136-137

How was the nbs at that speed? Was it all stock?

 

[BG1988]

i'm curious about this driveshaft thing, I have only taken mine up to 132 but I know it has more I just didn't have more runway, my nbs would do 136-137

it's Very high grade aluminium possibly solid not sure though


there is sooo much torque if it was normal aluminium it would twist it self and break with in a few miles of coming off the assembly line... haha

 

[swathdiver]

i'm curious about this driveshaft thing...

Critical Speed is a term used to describe the speed at which a driveshaft would whip or bend or self-destruct. Exceeding this speed can also damage the transmission or transfer case and differential due to the whipping and vibrations.

CS is determined by calculating the tube length of the propeller shaft or the length between centers of the u-joints, the diameter of the shaft, thickness of the material and material used and the u-joint sizes.

Brent, aluminum shafts are not solid, they are tubes as well. They must use larger diameter tubes and usually thicker wall diameters to equal or exceed a steel driveshaft. In my racing days, aluminum driveshafts were all the rage for a time, until every single one of them twisted off, no match for the horsepower and torque of our motors back then.

https://spicerparts.com/calculators/driveshaft-safe-operating-rpm-calculator

My rear propeller is 53-1/2 inches long, 3-1/2 inches in diameter and has a metal thickness of .083 inches and uses 1350 u-joints. CS = 4,556 RPMs

My front propeller is 28-1/4 inches long, 2-3/4 inches in diameter and has a metal thickness of .083 inches and uses 1344 u-joints. CS = 5,000 RPMs

I have as yet to actually put a tape measure to mine to verify, this information is internet derived.