Ford F150 Forum - Community of Ford Truck Fans

Topic Sponsor
1997 - 2003 Ford F150 General discussion on the Ford 1997 - 2003 F150 truck.

Rear diff question

Thread Tools
 
Search this Thread
 
Old 10-06-2015, 06:46 PM
  #1  
Senior Member
Thread Starter
 
Fordfan2006's Avatar
 
Join Date: Jul 2013
Location: Mooresville indiana
Posts: 3,266
Received 182 Likes on 168 Posts
Default
My 2003 Supercrew 4x4 has a 3:73 open diff and the tag says 75W-90 I've only seen 75W-140 for the rear diff.. Which should I use?
Attached Thumbnails Rear diff question-image-922408408.jpg   Rear diff question-image-1803340377.jpg  
Last edited by Fordfan2006; 10-06-2015 at 07:19 PM.
Fordfan2006 is offline  
Reply Like
Old 10-06-2015, 06:48 PM
  #2  
Senior Member
 
jstockert's Avatar
 
Join Date: Aug 2013
Location: Gulfport MS
Posts: 1,243
Received 143 Likes on 135 Posts

Default
Originally Posted by Fordfan2006
My 2003 Supercrew 4x4 has a 3:73 open diff and the tag says 75W-90 I've inky seen 75W-140 for the rear diff.. Which should I use?
75w-140 full syn. 2.8 quarts
jstockert is offline  
Reply Like
Old 10-06-2015, 06:56 PM
  #3  
Senior Member
Thread Starter
 
Fordfan2006's Avatar
 
Join Date: Jul 2013
Location: Mooresville indiana
Posts: 3,266
Received 182 Likes on 168 Posts
Default
Originally Posted by jstockert
75w-140 full syn. 2.8 quarts
haha okay good because I spent lie $65 on that weight of fluid.. I was about to not be very happy.
Fordfan2006 is offline  
Reply Like
Old 10-06-2015, 06:58 PM
  #4  
Senior Member
 
02_Black_On_White's Avatar
 
Join Date: Dec 2013
Posts: 6,446
Received 399 Likes on 286 Posts

Default
Originally Posted by Fordfan2006
My 2003 Supercrew 4x4 has a 3:73 open diff and the tag says 75W-90 I've inky seen 75W-140 for the rear diff.. Which should I use?
Why does the tag say that? It should be 75w-140 and you to add a bottle of FM from ford.
02_Black_On_White is offline  
Reply Like
Old 10-06-2015, 07:19 PM
  #5  
Senior Member
Thread Starter
 
Fordfan2006's Avatar
 
Join Date: Jul 2013
Location: Mooresville indiana
Posts: 3,266
Received 182 Likes on 168 Posts
Default
Originally Posted by 02_Black_On_White
Why does the tag say that? It should be 75w-140 and you to add a bottle of FM from ford.
the friction modifier is for limited slips mines just a open diff ( I wish I had a limited slip though )
Fordfan2006 is offline  
Reply Like
Old 10-06-2015, 08:37 PM
  #6  
Senior Member
 
jstockert's Avatar
 
Join Date: Aug 2013
Location: Gulfport MS
Posts: 1,243
Received 143 Likes on 135 Posts

Default
Originally Posted by 02_Black_On_White
Why does the tag say that? It should be 75w-140 and you to add a bottle of FM from ford.
Because ford changed the specs to 75-140 after the release of that model year.
jstockert is offline  
Reply Like
Old 10-06-2015, 08:46 PM
  #7  
Senior Member
Thread Starter
 
Fordfan2006's Avatar
 
Join Date: Jul 2013
Location: Mooresville indiana
Posts: 3,266
Received 182 Likes on 168 Posts
Default
Originally Posted by jstockert
Because ford changed the specs to 75-140 after the release of that model year.
september 2002 is when it was built
Fordfan2006 is offline  
Reply Like

Trending Topics

Old 10-06-2015, 09:30 PM
  #8  
Senior Member
 
jstockert's Avatar
 
Join Date: Aug 2013
Location: Gulfport MS
Posts: 1,243
Received 143 Likes on 135 Posts

Default
Originally Posted by Fordfan2006
september 2002 is when it was built
I'm not sure when the service bulletin came out changing the specs for rear diff fluid. They did the same thing when they changed the motor oil to run from 5-30 to 5-20.
jstockert is offline  
Reply Like
The following users liked this post:
Ford Fan#1 (10-07-2015)
Back to Subforum
1997 - 2003 Ford F150
View Next Unread
1999 4.6 rough idle/ stalling




Advanced Search
Quick Reply: Rear diff question


Reply Closed Thread Share

All times are GMT -4. The time now is 03:26 AM.