Take a guess then watch the video.

http://www.youtube.com/watch?v=uN9he2qrA9Y

 

im over .5 seconds quicker in 4hi, but launching in 4low is a terrible idea.

my best 2wd launch was 7.03, but usually around 7.2ish, in 4hi its sub 7 by a hair

 

Ouch! I would never take 4low to 60. Heck the owners manual says don't go above 25mph. Heck I wouldn't even dare to put it in 4low on the pavement yet alone gun it, too much torque and grip.

 

wtf... yeah i wouldnt either..

 

I have...by mistake...I think she tops out around 45-50...thats teh downside of electronic shifting...

 

It's just having a little fun...

If something breaks, it probably needed to be replaced anyway.

 

Using 4wd to launch your truck is just a bad idea in general. These 4wd systems were not built for that in anyway. You not even suppose to use 4wd on dry pavement let alone launching it. That's how you break stuff, and it can be expensive if you start breaking half shafts or ruining something in your diff or t-case.

 

diesel guys do boosted launches in 4hi.

 

That's not exactly true. I didn't turn the steering wheel more than 1/2 turn while on the pavement so I wouldn't bind the driveline. That's really hard on it as you said.

When you're locked in 4lo, you're distributing the torque 50/50 front and rear. Even though you've got more torque available from the transfer case gear reduction, you split it nicely between the front and rear axle so neither axle gets overloaded.

In 2hi all the torque goes to the rear end, so that's just as hard (if not harder) on the rear than launching in 4lo.

The only part that really gets stressed in 4lo is the transfer case itself.

You're more likely to bust something off-roading in 4lo because when you lift wheels you can put 100% of the torque on a single axle.

 

Yep, seeing a 3 ton+ rig doing 4 seconds 0-60 off a brake boosted launch in 4x4 is just insane.