Originally Posted by rancheroracer

I bracket race the truck launching at idle, in 2wd with elec. locker on it works. For a jacked up ET run I use 4wd & locker on, too much rpm & it will still slip some. For now I've found about 2000 rpm gives the best 60'. I haven't tried a lot of different tire pressures since what I"m doing now works well. Tried some spring blocks, didn't help, tried slapper bars, didn't help, just made ride rougher.

Originally Posted by Mark Miller

The 2011 Super Cab 4X4 i had with the Eco Boost it would do ok in 2wd with the LS rear axle.Now the 2013 Super Cab i had i always used 4WD High like you,it didn't have the LS rear axle.I found that the 2000-2,200 launch worked good in my trucks also.Are you using the Sport Mode or Tow Haul Mode in 4X4 or just in the normal Mode?
Thanks Mark

Originally Posted by zx12-iowa

And you have a. 6.5' box as well so a bit heavier than the 5.5'...

Nice run congrats!

Originally Posted by rancheroracer

No Sport or Tow, my tuner has it set up to run w/o it.

Billbeau If you could get the tranny to shift a little harder and qwicker meaning the time between gears. These trannys are a little sloppy. The amount of rpm s dropped between gears is a little to much. I don't know if there are any tranny guys out there that can trick out these trannys but it would help allot.

The tune I'm running he has the shifting down really well.

Originally Posted by Mark Miller

When you ran the 14.08 before you put the tuner on it did you try Sport Mode?Just curious if ran without the tuner if they're actually faster in the 1/4 mile in Sport Mode?

Originally Posted by rancheroracer

Tried it both ways, actually not faster. Seems like it would be from driving on the street but my truck anyway was quicker when it's not holding the shifts higher.