Recent Topics
Peak Cool Orange no longer GM DEXCOOL Approved?
by Matt1980 - 05/26/20 08:10 PM
Mesh Router System - 160MHz Backhaul?
by JHZR2 - 05/26/20 08:06 PM
Downshift before WOT?
by Avery4 - 05/26/20 08:01 PM
Getting a free 1997 Chevy 1500 extended cab
by FADEC - 05/26/20 07:22 PM
Got new tires for the trailer today
by BeerCan - 05/26/20 07:06 PM
how much cca is necessary for a truck battery?
by apollo18 - 05/26/20 06:17 PM
Electric car charge cord review
by OVERKILL - 05/26/20 04:55 PM
faulty bosch right angle drill
by benjy - 05/26/20 04:14 PM
2017 Accord Hybrid Brake Fluid Flush
by Tundragod - 05/26/20 04:12 PM
06 GMC Hybrid
by hardheaded - 05/26/20 03:57 PM
98 Camry busted oil drain plug
by JeffKeryk - 05/26/20 03:31 PM
Picked up a used Honda Push Mower today
by redhat - 05/26/20 02:43 PM
Mevotech vs. MOOG
by pbm - 05/26/20 01:47 PM
Any experience with MU-MIX ?
by henni - 05/26/20 01:22 PM
RA code
by Koncrete_Cam - 05/26/20 12:12 PM
best alternative to a group 79? hopefully more cca
by apollo18 - 05/26/20 11:25 AM
Gas Prices Are Going Up
by BlueOvalFitter - 05/26/20 10:49 AM
Newest Members
Bruce_S, Rwogs, MechEnDawg, jimbacot, MowerVet
71537 Registered Users
Who's Online Now
124 registered members (4WD, 2010Civic, 87sammy, 2015_PSD, 2003f7, 97prizm, 14 invisible), 2,420 guests, and 62 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics305,921
Posts5,282,791
Members71,537
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
2005 Ford Ranger FX4 Off-Road #5369948 03/07/20 03:03 PM
Joined: Aug 2010
Posts: 7,726
K
Kira Online Content OP
OP Online Content
K
Joined: Aug 2010
Posts: 7,726
This is the "neighbor's truck" I purchased in August which is still under 50K.
Being 16 MY old I want to change the differential fluids.
80W-90 is the specced fluid. I want to go synthetic as they're uniformly suggested. Also, the FM for the rear is already in the synthetics.

A few people urged me to use a 75W-140. This is the lube for the Level II's Torsen rear.

How does one calculate any benefit. With my truck's low mileage I'm thinking the specced 80W-90 is fine.

Any towing will be rare and done in temperate climates.

I asked a similar question a while back but deciding between conventional lube and synthetics was the focus then.

I am going synth. Is the 140 even to be considered?

Re: 2005 Ford Ranger FX4 Off-Road [Re: Kira] #5369976 03/07/20 03:33 PM
Joined: Aug 2003
Posts: 14,707
R
Rand Offline
Offline
R
Joined: Aug 2003
Posts: 14,707
supertech "full syn" 75w90 gl-5 would be a cost effective option.
https://www.walmart.com/ip/Super-Tech-Full-Synthetic-Gear-Lubricant-75W-90-1-Quart/309470123


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: 2005 Ford Ranger FX4 Off-Road [Re: Kira] #5369980 03/07/20 03:38 PM
Joined: Aug 2012
Posts: 519
R
Recalculating Offline
Offline
R
Joined: Aug 2012
Posts: 519
I purchased my 2008 Ranger 4WD XLT @ 74k with the regular 3.73 rear differential maybe two months prior to your original post.

I used the 75W140 since like you, do not use the truck in the winter. I chose to go with the 75W140 since I will tow a bass boat and fill up the bed with lumber on occasion.

Truck did not seem to mind while running it up the Northway after the change.

Will be changing out the transmission and front differential fluids as the Spring gets underway to complete the base line history on the fluids.

Looks like Rand hit your mark.

Last edited by Recalculating; 03/07/20 03:42 PM.

2009 Honda CR-V EX-L 63k
2007 Buick Lacrosse 63k
2008 Ford Ranger XLT V-6 4.0 SOHC 76k
Re: 2005 Ford Ranger FX4 Off-Road [Re: Kira] #5369995 03/07/20 04:05 PM
Joined: Apr 2006
Posts: 9,775
0
01rangerxl Offline
Offline
0
Joined: Apr 2006
Posts: 9,775
At one point Ford issued a TSB specifying 75W140 in place of 80W90 in some limited slip 8.8" applications (non-Torsen) to reduce "chatter" and other noises.

I used it in the 7.5 in my old 2.5L I4 Ranger because I figured what's good for an 8.8 must be good for a 7.5. It worked fine and had no noticeable impact on fuel economy. In fact the best MPG I ever got in that truck was with the 75W140 in it.

The only synthetic 80W90 I know of is Amsoil. 75W90 and 75W140 synthetics are what you will find in stores.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 239K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 203K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 256K miles
Re: 2005 Ford Ranger FX4 Off-Road [Re: Kira] #5370055 03/07/20 06:14 PM
Joined: Aug 2017
Posts: 1,348
1
14Accent Online Content
Online Content
1
Joined: Aug 2017
Posts: 1,348
According to my Amsoil rep, 75w140 is pretty much perfect for anything calling for 75w90 or 80w90.

You'll do fine with the 140.


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

1980 Honda CB900C - 15k mile cream puff
Re: 2005 Ford Ranger FX4 Off-Road [Re: Kira] #5370245 03/07/20 10:19 PM
Joined: Nov 2018
Posts: 175
S
stanlee Offline
Offline
S
Joined: Nov 2018
Posts: 175
I'm pretty sure Ford has re-spec'd most rear 8.8 diffs to 75w-140. There is really no good reason not to unless your some sort of fractional gas mileage freak. A lower winter rating and vastly better protection for hard use (off road, towing, aggressive driving etc).

Re: 2005 Ford Ranger FX4 Off-Road [Re: Kira] #5370410 03/08/20 06:13 AM
Joined: May 2018
Posts: 1,681
K
ka9mnx Offline
Offline
K
Joined: May 2018
Posts: 1,681
Ford back spec'd all rear axles to synthetic 75w-140 around 2005. I purchased my 2005 Ranger new and after 6 months they rebuilt the rear axle under warranty. They put in 75w-140. Since then I have changed the rear axle oil with SuperTech syn 75w-140. I don't know if the specs changed for the front axle.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: 2005 Ford Ranger FX4 Off-Road [Re: Kira] #5370442 03/08/20 07:20 AM
Joined: Oct 2014
Posts: 964
N
NH73 Offline
Offline
N
Joined: Oct 2014
Posts: 964
I was never aware that they were back spec'd. I have a 04 Sport Trac, which basically has the same setup. But I don't tow or haul heavy either. I just replaced them with 75w90, but if I knew they were backspaced, I would of pushed for 70w140. Like 01rangerxl said, you will be hard pressed to to find a synthetic 80w90, so I really don't see a problem using 70w90 or 70w140 instead. It would be nice just to keep both axles the same, that what I would do.


2017 Toyota RAV4 Hybrid
2004 Ford Explorer Sport Trac
2012 Gravely ZT XL 48 w/ Kawasaki FR730
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™