1983 - 2012 Ranger & B-Series All Ford Ranger and Mazda B-Series models

Question about differential lube????

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Old

Jul 1, 2008 | 06:28 PM

#1

meck1

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Tuned

Joined: Feb 2003

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Question about differential lube????

The manual for my '94 Ranger says to use 90 wt. oil in the differential. (It's a 7.5 in. differ.) Around here noone seems to be selling straight 90 wt. oil anymore. They have 85-140W and 80-90W. Which is the better one to substitute for 90W? Or does it matter? Thanks.

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Old

Jul 1, 2008 | 06:46 PM

#2

fordfaninIL.

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Joined: Aug 2006

Posts: 363

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From: east dubuque, il.

Use the 80-90 if it is not limited slip. If it is limited slip then you will need an additive from ford.

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Old

Jul 1, 2008 | 09:30 PM

#3

hydro_37

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Joined: Nov 2006

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From: Iowa

If you use a full synthetic it is even better for it. Less wear and will help with the gas mileage. JMO I 2nd the 80-90wt.

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Old

Jul 4, 2008 | 03:25 AM

#4

PW01

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Joined: Jan 2003

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Mobil 1 75w 90

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Old

Jul 16, 2008 | 08:55 PM

#5

crfarley

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Joined: Sep 2007

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I'm crfarley and I have a 2000 4.0, 2wd, and a limited slip differential. I noticed, when my son was driving out the road, a humming noise from the rear end. I was in our yard. You couldn't hear the engine. One neighbor said he heard the noise and said he had a similar problem and the whole rear end dropped out of his vehicle. Any help or ideas?

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Old

Jul 17, 2008 | 02:19 PM

#6

hydro_37

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Joined: Nov 2006

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From: Iowa

crfarley, it could be alot of things. Check for brake drag, the limited slip needs a special additive in the fluid too. The brakes may be making the noise....nt the rear end.

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Old

Jul 17, 2008 | 09:05 PM

#7

Dad's Truck

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Joined: Oct 2004

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Lucas makes a good gear lube. I used to recommend it to customers who came in complaining about diff noise.

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Old

Jul 17, 2008 | 09:05 PM

#8

Dad's Truck

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argh. double post. please baleet.

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Old

Jul 18, 2008 | 01:10 AM

#9

R031Kona

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Joined: Oct 2007

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From: The 'Loops

I use Mobil 75W90 synthetic in my 91 + 4 ounces of Ford LSD additive.

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Old

Jul 28, 2008 | 09:41 AM

#10

crfarley

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Joined: Sep 2007

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I had the rear brakes worked on a couple of weeks ago and that did not solve the problem. Some think that something had slipped in the differntial. Some think that it is a problem with the O-ring and bearings. Possible rebuild. I'm having it checked starting today. I'll let you know how things turn out. Thanks for your input. crfarley

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75w90, 90, differential, f350, straight

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