Does my front axle need friction modifier?

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  #1  
Old 01-18-15, 04:52 PM
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Does my front axle need friction modifier?

I have a 92' Ford Ranger XLT with 2.9 V6 engine and pushbutton 4WD. It's time for me to top off or replace the gear oil in the front axle.

When I had my rear differential rebuilt, the mechanic told me to make sure I add friction modifier when I change out the gear oil in the rear axle.

Does my make/model require friction modifier with the gear oil in the front axle? If it helps, the door placard indicates F7 under the axle category.
 
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Old 01-18-15, 05:28 PM
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As far as I know the friction modifier only gets added to a limited slip differential.
 
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Old 01-19-15, 10:31 AM
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Did you look in the Owners Manual? I doubt that your front axle needs an additive.
 
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Old 01-19-15, 12:09 PM
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The owner's manual only says front locking differentials will need friction modifier added. But the manual does not tell me what type of front axle my truck has.
 
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Old 01-19-15, 11:27 PM
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Taken from the Ford Ranger spec sheet.....
Your F7 differential is a 7.5" limited slip with a ratio of 4.10 and capacity of 2570 lbs.[TABLE]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD="width: 25%"][/TD]
[/TR]
[/TABLE]
 
  #6  
Old 01-20-15, 06:46 AM
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Thanks Pete,

So I guess the F7 designation applies to both front and rear axles?
 
  #7  
Old 01-20-15, 09:37 AM
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There should be a Service Parts ID label listing all options on the vehicle that should tell you if you have a limited slip in the front. Ask the local Ford Dealer for assistance if necessary.
 
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Old 01-20-15, 04:59 PM
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I asked a differential repair place just now. They said the front axle is not limited slip. But it won't hurt it if I add friction modifier anyway.
 
  #9  
Old 01-20-15, 06:15 PM
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only one wheel drives on the front. A fork pulles in from a vacuum actuator that pulls a cable. It pulls the fork to lock the differential to the drive shaft. The cv joints in your truck are always turning AFAIK..

Additionally there is a motor with a worm gear in the TC that puts the transfer case into 4wd.

Most likely your 4 wd truck is actually 2 wd with open rear.. The only other option on these trucks was a locker for the rear only..

As far as additive.. I would say nope....


https://www.youtube.com/watch?x-yt-cl=84359240&v=q-rQTHMVAuw&x-yt-ts=1421782837#t=119
 
  #10  
Old 01-20-15, 06:23 PM
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Look for the tag on the differential cover bolts. The bottom row of text is the spec.
It would be stamped..... 410 75 for an open differential.
It would be stamped .... 4L10 75 for a limited slip differential.
 
  #11  
Old 01-25-15, 05:47 PM
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Thanks for reminding me. The rear axle does have such a tag. I'll look at it and record what the tag says.
 
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