Go Back   Ford F150 Forum - Community of Ford Truck Fans > Pre-1997 F150 > 1987 - 1996 F150
Sign in using an external account
Register Forgot Password?


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 05-12-2014, 04:28 PM   #1
Senior Member
5 Year Member
 
ScaldedApe's Avatar
 
Join Date: May 2008
Location: Texas Border
Posts: 353
Mentioned: 1 Post(s)
Thanks: 55
Thanked 22 Times in 18 Posts
Feedback Score: 0 reviews
Default Fluid weight difference - Owner's Manual vs. Motorcraft

So I'm trying to order differential fluid for both the front and rear diff and I'm getting two different numbers. My owner's manual says to use 80w-90 front and rear and motorcraft.com says to use the following:

"Part Description: (Motor Oils And Lubricants Usa Usage); Hypoid gear lubricant - ""Use 75W140 synthetic oil ONLY'' "

I know this subject gets beat to death, but I wonder why the difference in weights? Did Ford come to some new understanding?
__________________
The Red Rocket - 1996 XLT Ext. Cab 4x4 O/R 5.8L
ScaldedApe is offline   Reply With Quote
Old 05-12-2014, 07:14 PM   #2
We'd do it
 
Just call me Sean's Avatar
 
Join Date: May 2008
Location: Orlando,Fl.
Posts: 31,562
Mentioned: 2 Post(s)
Thanks: 29
Thanked 383 Times in 341 Posts
Feedback Score: 1 reviews
Send a message via Yahoo to Just call me Sean
Default

They didn't use synthetics when our trucks were new.
__________________
Quote:
Originally Posted by Early Cuyler
Fights begin, fingerprints are took, days is lost, bail is made, court dates are ignored, cycle is repeated.
Just call me Sean is online now   Reply With Quote
Old 05-12-2014, 07:36 PM   #3
Senior Member
5 Year Member
 
ScaldedApe's Avatar
 
Join Date: May 2008
Location: Texas Border
Posts: 353
Mentioned: 1 Post(s)
Thanks: 55
Thanked 22 Times in 18 Posts
Feedback Score: 0 reviews
Default

Quote:
Originally Posted by Just call me Sean View Post
They didn't use synthetics when our trucks were new.
So does Ford now recommend this new weight and synthetic? Front and rear?
__________________
The Red Rocket - 1996 XLT Ext. Cab 4x4 O/R 5.8L
ScaldedApe is offline   Reply With Quote
Old 05-12-2014, 10:18 PM   #4
It's a Canadian thing eh!
 
sylver91's Avatar
 
Join Date: Nov 2010
Location: Ontario, living across a hay field
Posts: 6,663
Mentioned: 13 Post(s)
Thanks: 17
Thanked 183 Times in 178 Posts
Feedback Score: 0 reviews
Default

As far as I knew only Lightning trucks recommended 75W-140 GL5. Everything else is 80w-90 with or without 4 oz of trac modifier If you have an LS.
__________________
96 300ci M5OD 2wd Reg Cab Long Bed 3.31 LS Gears and 8-Track player

A question that sometimes drives me hazy: am I or are the others crazy?
Albert Einstein
sylver91 is offline   Reply With Quote
Old 05-13-2014, 12:45 AM   #5
Senior Member
5 Year Member
 
ScaldedApe's Avatar
 
Join Date: May 2008
Location: Texas Border
Posts: 353
Mentioned: 1 Post(s)
Thanks: 55
Thanked 22 Times in 18 Posts
Feedback Score: 0 reviews
Default

I looked at the motorcraft part number notes and it looks like at one point it had been replaced by 75w-90. But all the numbers are discontinued.

I may just stick with synth 75w-90 since it's closet to the manual.
__________________
The Red Rocket - 1996 XLT Ext. Cab 4x4 O/R 5.8L
ScaldedApe is offline   Reply With Quote
Old 05-13-2014, 02:23 PM   #6
Senior Member
 
Join Date: Oct 2010
Location: Charlotte, NC
Posts: 1,809
Mentioned: 0 Post(s)
Thanks: 15
Thanked 77 Times in 69 Posts
Feedback Score: 0 reviews
Default

Quote:
Originally Posted by ScaldedApe View Post
I looked at the motorcraft part number notes and it looks like at one point it had been replaced by 75w-90. But all the numbers are discontinued.

I may just stick with synth 75w-90 since it's closet to the manual.
I use 75w-90 with no issues.
__________________
1990 F150 XLT Lariat - 2wd
302/5.0L - E4OD | 3.55 Gears - Non-Limited Slip | Stock GT40 Heads | .030 Over (Speed Pro H120CP30 Pistons) | T-Moss Ported Lower Truck Intake | Comp Cams XE258HR-14 (35-512-8) | Hedman Shorty Headers | Will install my Trick Flow 58cc heads when I quit being a lazy bum.
qdeezie is offline   Reply With Quote
Old 05-20-2014, 09:56 PM   #7
Senior Member
 
Flareside302's Avatar
 
Join Date: Jan 2013
Location: La Vergne, TN
Posts: 441
Mentioned: 0 Post(s)
Thanks: 2
Thanked 19 Times in 19 Posts
Feedback Score: 0 reviews
Default

lightning's were 75w140 all others were 80w90. but 75w90 is a great alternative.
__________________
92 Flareside 302
.030 overbore, Flat top pistons, Comp Cam XE264HR-14, Scorpion 1.72 Roller Rockers
Trick Flow Track Heat 170cc/58cc chamber heads, Ported/port matched truck intake
Hedman Longtubes, magnaflow cats, X-Pipe, Spintech race mufflers
AOD, red clutch packs, 2" OD band, Rebuilt/upgraded valve body, Stall coming soon
Flareside302 is offline   Reply With Quote
Old 05-20-2014, 09:56 PM
 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Join F150 Forum

 

The Mustang Source
All times are GMT -4. The time now is 07:24 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.