Positive traction ??? - F-Series & SuperDuty Diesel Forums

marine6132 · 10-03-2011, 10:13 AM

Hello, I have a 2011 F250 4x4 crewcab lwb with the 6.7. I was wondering how I can tell if the front axle has a limited slip or just a open differential? Also my hubs have auto and lock on them does it mean that when I turn the hub to lock that I have positive traction? Thanks for the help and God Bless our straight service men and woman.

DaveBen · 10-03-2011, 10:25 AM

to SDD. First off I doubt you have posi in the front axle, unless you ordered it. Posi in the front makes for some strange steering when the hubs are locked. The steering wheel will shake from side to side. There is a tag affixed to the front axle cover that will tell you if you do or don't have posi. Auto/Lock on the front hubs has to do with the ESOF (Electronic Shift On the Fly) four wheel drive button on the dash. If you leave them in Auto, they will engage when you shift to four wheel drive and disengage when you shift out. Lock will lock the hubs in all of the time. Not recommended for driving on the dry pavement.

Dave

marine6132 · 10-03-2011, 10:37 AM

Thanks for the reply. One other question , if I can shift on the fly with the hubs in auto why is there a lock position?

DaveBen · 10-03-2011, 12:52 PM

Yes you can shift on the fly in Auto. Lock is there if Auto does not engage smoothly, you have to get out and lock them manually. It is a backup for Auto.

Dave

sagebel · 10-03-2011, 09:16 PM

The auto function requires you to drive a few feet to engage. Manually locking the hubs will give you four wheel drive as soon as the transfer case is engaged. I usually manually cycle my hubs a few times during an oil change while the oil is draining just to keep them excercised.

10-03-2011, 10:13 AM	#1
marine6132 SDD Junior Member Join Date: Jan 2011 Location: SC Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts	Positive traction ??? Hello, I have a 2011 F250 4x4 crewcab lwb with the 6.7. I was wondering how I can tell if the front axle has a limited slip or just a open differential? Also my hubs have auto and lock on them does it mean that when I turn the hub to lock that I have positive traction? Thanks for the help and God Bless our straight service men and woman.

10-03-2011, 10:25 AM	#2
DaveBen SDD Senior Member Join Date: May 2005 Location: Ukiah, California Posts: 7,866 Thanks: 127 Thanked 505 Times in 488 Posts	to SDD. First off I doubt you have posi in the front axle, unless you ordered it. Posi in the front makes for some strange steering when the hubs are locked. The steering wheel will shake from side to side. There is a tag affixed to the front axle cover that will tell you if you do or don't have posi. Auto/Lock on the front hubs has to do with the ESOF (Electronic Shift On the Fly) four wheel drive button on the dash. If you leave them in Auto, they will engage when you shift to four wheel drive and disengage when you shift out. Lock will lock the hubs in all of the time. Not recommended for driving on the dry pavement. Dave __________________ 2004 F-350 Regular cab with 6.0, Torqshift, 4X4, and just about all of the rest of the options. I added Guages, Satellite Radio, Air Horns, and a coolant filter. Bilstein shocks. Battery Desulphater that really works. Installed Jimmi Jammers. Pictures here: http://community.webshots.com/user/dbennett48 Completely Stock. I had a Detroit Diesel 8V92TA in a KW dump truck in 1980. That sucker would put out 425 hp but would never out pull a CAT.

10-03-2011, 12:52 PM	#4
DaveBen SDD Senior Member Join Date: May 2005 Location: Ukiah, California Posts: 7,866 Thanks: 127 Thanked 505 Times in 488 Posts	Yes you can shift on the fly in Auto. Lock is there if Auto does not engage smoothly, you have to get out and lock them manually. It is a backup for Auto. Dave __________________ 2004 F-350 Regular cab with 6.0, Torqshift, 4X4, and just about all of the rest of the options. I added Guages, Satellite Radio, Air Horns, and a coolant filter. Bilstein shocks. Battery Desulphater that really works. Installed Jimmi Jammers. Pictures here: http://community.webshots.com/user/dbennett48 Completely Stock. I had a Detroit Diesel 8V92TA in a KW dump truck in 1980. That sucker would put out 425 hp but would never out pull a CAT.

10-03-2011, 09:16 PM	#5
sagebel Stock? Pfft! Join Date: Apr 2005 Location: Silverdale, WA Posts: 908 Thanks: 5 Thanked 27 Times in 27 Posts View Photos By: sagebel	The auto function requires you to drive a few feet to engage. Manually locking the hubs will give you four wheel drive as soon as the transfer case is engaged. I usually manually cycle my hubs a few times during an oil change while the oil is draining just to keep them excercised. __________________ Light weight 2011 F-250 6.7 CCSB 4x4 in Sterling Grey Metallic Daily rider: 2010 Cannondale Quick 4

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10-03-2011, 10:37 AM	#3
marine6132 SDD Junior Member Join Date: Jan 2011 Location: SC Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks for the reply. One other question , if I can shift on the fly with the hubs in auto why is there a lock position?