Notices
1999 - 2016 Super Duty 1999 to 2016 Ford F250, F350, F450 and F550 Super Duty with diesel V8 and gas V8 and V10 engines
Sponsored by:
Sponsored by: Real Truck

99 f250 sd

Thread Tools
 
Search this Thread
 
Old Aug 29, 2015 | 06:13 PM
  #1  
sweetpea30's Avatar
sweetpea30
Thread Starter
|
New User
Joined: Aug 2015
Posts: 1
Likes: 0
Cool 99 f250 sd

My mother in law has been driving her truck since she bought it used, with the lock outs in four wheel drive. Will that cause any damage? It was not engaged on the inside, but just curious. She bought it last summer I believe.
 
Reply
Old Aug 29, 2015 | 06:25 PM
  #2  
LivingLarge's Avatar
LivingLarge
Post Fiend
Joined: Feb 2011
Posts: 26,410
Likes: 6
From: Ft. Lauderdale, FL
Nope, she just had crappy fuel economy... A few of the guys from the excursion forums leave them locked in all winter (regardless of snow or not). As long as the actual transfercase was not engaged that is.
 
Reply
Old Aug 30, 2015 | 09:13 AM
  #3  
ashleyroachclip's Avatar
ashleyroachclip
Laughing Gas
15 Year Member
Liked
Loved
Community Favorite
Joined: Oct 2007
Posts: 952
Likes: 101
I run mine (hubs) locked all the time
Only unlock them when I am going to be traveling on the freeway.

There is absolutely no measurable difference in fuel mileage .
 
Reply
Old Aug 30, 2015 | 09:14 AM
  #4  
texastech_diesel's Avatar
texastech_diesel
Token Redneck
15 Year Member
Liked
Loved
Community Favorite
Joined: Jun 2007
Posts: 9,335
Likes: 344
From: Breckenridge, TX
Club FTE Silver Member

Originally Posted by ashleyroachclip
There is absolutely no measurable difference in fuel mileage .
Same here, never noticed a difference one way or the other.
 
Reply
Old Aug 30, 2015 | 11:06 AM
  #5  
LivingLarge's Avatar
LivingLarge
Post Fiend
Joined: Feb 2011
Posts: 26,410
Likes: 6
From: Ft. Lauderdale, FL
I lost .5 mpg on a 1200 mile trip on my previous ex v10. Hand calculated.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
rockcrusher 24
1999 - 2016 Super Duty
10
Mar 29, 2015 07:38 PM
cali47tide
1999 - 2016 Super Duty
7
Nov 6, 2014 10:09 PM
bigjon2u2
1999 - 2016 Super Duty
8
Dec 20, 2008 01:27 AM
pinshooter13
1987 - 1996 F150 & Larger F-Series Trucks
25
Dec 1, 2005 11:26 AM




All times are GMT -5. The time now is 05:34 AM.

story-0
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-1
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-2
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-3
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-4
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-5
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-6
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE
story-7
2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Slideshow: first look at the 810 hp 2026 Shelby F-150 Off-Road!

By Brett Foote | 2026-05-12 12:50:07


VIEW MORE
story-8
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Slideshow: Everything You Need to Know about the 2027 Super Duty Carhartt Package!

By Michael S. Palmer | 2026-05-07 17:51:06


VIEW MORE
story-9
10 Most Surprising 2026 Ford Truck Features!

Slideshow: 10 most surprising Ford truck options/features in 2026.

By Joe Kucinski | 2026-05-05 11:17:22


VIEW MORE