Launching in 4x4?

[Powerstroke_soldier]

Guys I know a lot of guys that launch off the line in 4x4 WHEN they have the electronic switch. I have a manual shift. A guy I know said he can run the whole 1/4 mile in 4 High. Why is that I can only get up to 45mph in 4 H? I have 37s with a 6 inch lift. If im doing 50MPH and press the gas alil to hard on dry pavement the back tires break loose. So when I lauch off the line I spin thru the 8th mile. Trying to fix that with out running drag slicks. I mean after all, Diesel Power Challenge contenders have to run the same tires the whole time and that is my dream.... One of these years. lol So can anybody give me some info?

[Foamy]

What do you mean you can only get up to 45 in 4hi? Does the truck top out and not accelerate anymore? And at the 50mph..are you still in 4hi, or in 2hi? With the manual shift, are you sure your hubs are locked in?

[Powerstroke_soldier]

I mean when im in 4 high, hubs locked, I can get up to around 45 before its topped out. The 50MPH rolling burn outs are in 2wd. I also should have mentioned I have an auto trans.

[greasltn]

If you're running close to redline at 45mph., you are not in 4hi. If you are not near redline and just running out of power, you need to check other things. Do your tires feel like they're jumping in 4hi like you have different gearing front and rear?

[Powerstroke_soldier]

No sir I have stock gears in the front and in the back. This is to damn crazy. I guess I am explaining this wrong cuz I talk to my friends and they all say the same thing. They cant get over 45MPH in 4High either. Were talking about cummins, DMax, and PSD. My tranny guy says with stock gears and stock t case no one is getting over 45mph. So does that make any sense?

[scottm0821]

Originally Posted by Powerstroke_soldier

No sir I have stock gears in the front and in the back. This is to damn crazy. I guess I am explaining this wrong cuz I talk to my friends and they all say the same thing. They cant get over 45MPH in 4High either. Were talking about cummins, DMax, and PSD. My tranny guy says with stock gears and stock t case no one is getting over 45mph. So does that make any sense?

No, not one damn bit, i can launch it 4 hi with the hubs locked ( i have a vaccum problem so no auto hubs) and go as fast as a want. i launch in 4-hi and have got to over 100MPH.

[jmonay740]

This is very strange, in winter i am in 4hi all the time, even 70 mph is not a problem

[Powerstroke_soldier]

Well I dont know. Im confused. I dont run out of power until 4500RPM. My gauge only goes up to 5000rpm. Hell cancel this thread. Im just going to have to get in my truck and keep trying **** till I have a better way of telling yall. I have never owned a 4x4 that would get over 45 in 4x4.

[scottm0821]

Now unless you mean you cant lock in 4WD over 45, that sounds right, your not suppost to try to lock in over 45mph. i never lock in over 20MPH. also, how do you break loose at 50? i somtimes can on a wet road, but i find it hard to believe on 37's at 50 with stock gears, you can break the back tires loose.

[Powerstroke_soldier]

HOLY COW! Ok then I guess I need to find out whats up with my truck. Its at the ford dealer right now. I will call them tomorrow and find out what the deal is. Thanks for all the help guys.