Acts like it's in 4 wheel drive, but it's not??? - Diesel Forum - TheDieselStop.com
Ford Diesel Forum / Powerstroke Forum
Ford Diesel Forum / Powerstroke Forum
Go Back   Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > 1999-2007 General Questions

1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

TheDieselstop.com is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 08-24-2007, 04:52 PM   #1 (permalink)
mdv
Junior Member
 
Join Date: Dec 2006
Location: McKinleyville, CA
Posts: 3
My Photos: (0)
Feedback Score: 0 reviews
Acts like it's in 4 wheel drive, but it's not???

Went to change front diff fluid, ran truck with switch in 4x4 mode to warm up the fluid. I did not turn the front hubs. Went a mile or so down the road and turned the corner and the front end acted like it was in 4x4. Turned off the 4x4 switch and the same thing happened while turning. The only way I could get it to stop acting like this was to put the truck in nuetral for awhile and coast or to stop put the truck in park then back to drive and everything was fine...no tire scuffing/hoping while turning. I checked the hubs when I got back home and they WERE NOT in the lock position. What is happening? Not sure if this is part of the problem but the hubs are a little tough to turn into the lock position. But the way I understand it is the truck would only be in 4x4 if the hubs were in lock position and the switched turned to 4x4.
__________________
2000 F250 SD 4x4 CC SB, 7.3L, 125,000 mi
Hutch Mod, Harpoon Mod, that's it!
mdv is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-24-2007, 04:58 PM   #2 (permalink)
Lifetime Supporting Member
 
klhansen's Avatar
 
Join Date: Jan 2003
Location: Eagle River, Alaska
Posts: 20,134
My Photos: (175)
Feedback Score: 0 reviews
Re: Acts like it's in 4 wheel drive, but it's not???

Welcome to TheDieselStop [img]/ubbthreads/images/graemlins/smile.gif[/img]

You most likely have a problem with the vacuum to your hubs. When they're in Auto position, they are supposed to lock and unlock with a vacuum pulse when the switch is turned, but it's possible they are actually locked.

Running with the hubs locked and t-case unlocked will cause some mild effects similar to the "crow hop" that you get when in 4x4 on dry pavement.

Sounds like your hubs need servicing and the vacuum system checked out.
__________________
First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
klhansen is offline   Reply With Quote Quick reply to this message
Old 08-24-2007, 05:53 PM   #3 (permalink)
mdv
Junior Member
 
Join Date: Dec 2006
Location: McKinleyville, CA
Posts: 3
My Photos: (0)
Feedback Score: 0 reviews
Re: Acts like it's in 4 wheel drive, but it's not???

Thanks for the reply. I'm sure it's time for servicing. Interesting that a vacuum pulse would lock and unlock the hubs depending on the position of the switch. Why would there even need to be a lock position on the hubs then? If they lock and unlock with the switch pulse seems like turning the hubs is unnessesary?
__________________
2000 F250 SD 4x4 CC SB, 7.3L, 125,000 mi
Hutch Mod, Harpoon Mod, that's it!
mdv is offline   Reply With Quote Quick reply to this message
Old 08-24-2007, 06:51 PM   #4 (permalink)
Senior Member
 
Join Date: Apr 1999
Location: Ashburn, Va. USA
Posts: 6,706
My Photos: (1)
Feedback Score: 0 reviews
Re: Acts like it's in 4 wheel drive, but it's not???

[ QUOTE ]
Thanks for the reply. I'm sure it's time for servicing. Interesting that a vacuum pulse would lock and unlock the hubs depending on the position of the switch. Why would there even need to be a lock position on the hubs then? If they lock and unlock with the switch pulse seems like turning the hubs is unnessesary?

[/ QUOTE ]

It's a back up for when the vacuum accuation doesn't work.

Wayne B
__________________
2000 F-250 XLT PSD 4X4 ESOF Auto, SC, LB, Gauges, Mag-HyTech Trans Pan & Rear End Cover, <font color="red"> (((XM))) Inside</font>, ATV Racks w/ Two Kawasaki Prairie 400 4X4's sitting on them, 25' Rockwood TT. Ashburn, Va. Member # 103 Pictures

www.CarpathiaHost.com
Wayne B is offline   Reply With Quote Quick reply to this message
Old 08-25-2007, 01:22 AM   #5 (permalink)
Senior Member
 
GAZ4x4's Avatar
 
Join Date: Jan 2007
Location: NorCal
Posts: 490
My Photos: (17)
Feedback Score: 0 reviews
Re: Acts like it's in 4 wheel drive, but it's not???

[ QUOTE ]
[ QUOTE ]
Thanks for the reply. I'm sure it's time for servicing. Interesting that a vacuum pulse would lock and unlock the hubs depending on the position of the switch. Why would there even need to be a lock position on the hubs then? If they lock and unlock with the switch pulse seems like turning the hubs is unnessesary?

[/ QUOTE ]

It's a back up for when the vacuum accuation doesn't work.

Wayne B

[/ QUOTE ]

Which Ford knows is a requirement because of all the vacuum hub failures!
__________________
2005 F-250 CC/SB 4X4, 6.0L PSD-Torqueshift
med wedgewood blue,towcommand,upfitter switches
5"procomp lift with 5" Donahoe shocks and rear springs, 35"tires, 4.30 gears
BCP mod, LED taillights, 4"Banks exhaust, Harpooned fuel tank,
Accufab intake elbow, ARP Headstuds
Pioneer avic-D3 with backup cams and ipod
GAZ4x4 is offline   Reply With Quote Quick reply to this message
Old 08-25-2007, 10:44 AM   #6 (permalink)
Senior Member
 
JimTJr's Avatar
 
Join Date: Dec 2001
Location: St. Louis, mo. Area
Posts: 13,868
My Photos: (20)
Feedback Score: 0 reviews
Re: Acts like it's in 4 wheel drive, but it's not???

Not a problem and nice to know your going to HAVE 4wd when you need it, (even if it means getting out of the truck) But if properly maintained, the vacume system is pretty dependable, contrary to what some on here feel. It doesn't show up here REALLY often as a failure. When it does, it can be a fairly inexpensive repair, though kind of labor intensive if you have to remove the WHOLE HUB to replace the inner seals.
__________________
Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now an ART (Specialists Flight Chief) with the USAFR 414th MXS Seymour Johnson AFB. My pics! '03 Dually pics!, New truck, 2011 F-350 SRW LB CC. White Platinum Lariat! 4x4

JimTJr is offline   Reply With Quote Quick reply to this message
Old 08-26-2007, 09:01 AM   #7 (permalink)
Senior Member
 
Join Date: May 2001
Location: Ft Myers Florida
Posts: 384
My Photos: (0)
Feedback Score: 0 reviews
Re: Acts like it's in 4 wheel drive, but it's not???

You didn't need to put the truck in 4 wheel drive...all you you needed to do is lock the front hubs in and drive it...you will be turning the axles and driveshaft to the transfer case...you are probably even turning some of the gears in the transfer case...I lock my hubs in about once a month to keep the oil moving on the gears and axles...usually run them engaged for a couple of days...also take truck to the sand dunes to engage the 4X4 itself to keep the solenoid working....just a thought....Kevin
__________________
'04 F-250 Lariat CC LWB 2wd 6.0 Torqshift Dark Satin Green/Arizona Beige TRADED
07 F-250 Lariat CC LWB 4x4 6.0..Dark Stone/Arizona Biege Built 11/27 here on 12/06/06 picked up on 12/07/06...love the truck.....pictures soon...


http://community.webshots.com/user/khitch710
khitch710 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

  Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > 1999-2007 General Questions

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Diesel Forum - TheDieselStop.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



Wheel & Tire Center

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 04:25 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.