Rear Diff Fluid - PowerStrokeNation : Ford Powerstroke Diesel Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 (permalink) Old 09-29-2012, 03:14 PM Thread Starter
JRF
PSN Newb
 
Join Date: Apr 2008
Location: PA
Posts: 14
Rear Diff Fluid

I want to change my rear diff fluid and noticed guys here are using 75w-140. My owners manual says 80w-90. Did Ford put out a TSB and change the specs?

96 F250 XLT SCLB 4X4 E4OD
JRF is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 09-29-2012, 03:29 PM
PMS medication required
 
joedown's Avatar
 
Join Date: May 2008
Posts: 453
Re: Rear Diff Fluid

Quote:
Originally Posted by JRF View Post
I want to change my rear diff fluid and noticed guys here are using 75w-140. My owners manual says 80w-90. Did Ford put out a TSB and change the specs?
Many are using full synthetic which is readily available in the 75w-140. If you have a limited slip diff don't forget the additive.

96 F350 4x4 XLT 7.3 76,472 orig miles, Stage I's, Adrenaline, IDM, EBPV, Tymar intake, Banks intercooler, downpipe, gauges, TW 6 position chip, John Wood Towmaster, 1.0 turbo, WW II, Electric fuel conversion, RSK, OH console, Durn cat done run off an I can't find it.
joedown is offline  
post #3 of 16 (permalink) Old 09-29-2012, 04:22 PM
PSN Veteran
 
Patrick Feeley's Avatar
 
Join Date: Mar 2008
Location: Tehachapi, CA
Posts: 2,845
Re: Rear Diff Fluid

There was something out there from Ford on it, but heck if I can find it (which bugs me ... so I'll keep looking!). Cheers!

97 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, Ext Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

SOLD: 94 F350 CC DRW PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, 3 DP, Bilsteins, $12 AIC, Coolant Filter, Explorer O/H Console, Trans Temp, Boost, and Pyro, Pedestal Mod, Gutted EBPV
Patrick Feeley is offline  
 
post #4 of 16 (permalink) Old 09-29-2012, 11:02 PM
PSN Veteran
 
Coueshunter's Avatar
 
Join Date: Nov 2010
Location: Gilbert, Az
Posts: 1,160
Re: Rear Diff Fluid

75w 140 is very common in rear diffs when they get worked or see 4wd action a lot

Back the Blue BUILD THREAD
POWERSTROKENATION-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Facebook-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Coueshunter is offline  
post #5 of 16 (permalink) Old 09-29-2012, 11:33 PM
1 Slo PoMoFo
 
Ranger50's Avatar
 
Join Date: Aug 2010
Location: EKY
Posts: 109
Re: Rear Diff Fluid

I used 75w140 when I just changed mine a few months ago. I had a poop load of it left over from not needing it on all the Jeep axle rebuilds and changes. I still have yet to put any whale sperm in the fluid, but I have only driven it 12 miles since changing the fluid.

"Never trust an intelligent man with no money to play fair."

97 F250. 213k. Just about as stock as stock can be. Cali mod. Yard ornament.
Ranger50 is offline  
post #6 of 16 (permalink) Old 09-30-2012, 02:01 PM Thread Starter
JRF
PSN Newb
 
Join Date: Apr 2008
Location: PA
Posts: 14
Re: Rear Diff Fluid

Thanks for the responses. I'm gonna go with 75w-140.

96 F250 XLT SCLB 4X4 E4OD
JRF is offline  
post #7 of 16 (permalink) Old 09-30-2012, 03:41 PM
PSN Veteran
 
zilla68's Avatar
 
Join Date: Jan 2009
Location: Moore, Oklahoma
Posts: 1,557
Re: Rear Diff Fluid

what about the front? same thing?

also, using mobil1 I see about a 9-10 dollar difference in the 140 being more money vs the 75w-90, I think I saw 75w-90 for rear and 140 for front, or vice versa, can't we just use the same thing front and rear?

Chris

Moore, Oklahoma



1996 Ford F350 4x4 Crew Cab PSD
6637 tymar
285-75-16 BFG All Terrains/Weld Wheels
3:55 gears
Automatic with billet convertor, tugger and alto discs
New Gearhead Tunes:
1 heavy tow
2 stealth mode
3 tow/econ
4 street perf
5 all out
6 high idle
1.0 housing
exhaust
zilla68 is offline  
post #8 of 16 (permalink) Old 09-30-2012, 04:26 PM
PSN Veteran
 
Coueshunter's Avatar
 
Join Date: Nov 2010
Location: Gilbert, Az
Posts: 1,160
Re: Rear Diff Fluid

Usually 140 in the rear and the 90 in the front. Some use 140 in both but usually on hard driven 4x4s. In most of our trucks the 90 in the front will be fine.

FYI the wal mart brand synnthetic diff fluid ranks VERY high and is very good oil

Back the Blue BUILD THREAD
POWERSTROKENATION-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Facebook-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Coueshunter is offline  
post #9 of 16 (permalink) Old 10-01-2012, 12:24 AM
Terminator Nation
 
Join Date: Aug 2007
Location: Petaluma, Ca
Posts: 5,121
Re: Rear Diff Fluid

The 140 Synthetic is recommended for heavy duty use in the rear in the factory service manual.
old man dave is offline  
post #10 of 16 (permalink) Old 10-01-2012, 01:24 AM
OEM Moderator
 
Tom S's Avatar
 
Join Date: Jul 2007
Location: Littleton, Colo
Posts: 9,381
Send a message via AIM to Tom S
Re: Rear Diff Fluid

Quote:
Originally Posted by Coueshunter View Post
Usually 140 in the rear and the 90 in the front. Some use 140 in both but usually on hard driven 4x4s. In most of our trucks the 90 in the front will be fine.

FYI the wal mart brand synnthetic diff fluid ranks VERY high and is very good oil
Do you have a link to some reading on that? It is definately less expensive.

1996 F250 Powerstroke 4X4 AUTO
DP-Tuner F-6 chip live tuned, BTS Transmission, Garrett 38R Turbo, Swamps Injectors 150cc, electric fuel,
Banks Intercooler, Reflexxions Cowl Hood, 17 degree HPOP, 4" Stainless Magnaflow &
Aeroturbine exhaust, Aeroforce OBD Scan Gauge, Truxedo tonneau cover
Dana 60 Precision Metal Fab RSK and SD Springs
Tom S is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the PowerStrokeNation : Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome