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Question about differential lube????

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Old Jul 1, 2008 | 06:28 PM
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meck1
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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
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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
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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
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Mobil 1 75w 90
 
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Old Jul 16, 2008 | 08:55 PM
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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
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hydro_37
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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
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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
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argh. double post. please baleet.
 
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Old Jul 18, 2008 | 01:10 AM
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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
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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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