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Old 02-06-2008, 04:42 PM
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Gears in the rear

Do the 4x4 models all come with the 410 gears in the rear? I was talking to this older guy about my truck a week or so ago and that what he told me. And also if I had changed out the Gears to 373's that I would get better gas milage.

What do you guys think? True or false? And will changing the gears out help?
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Old 02-06-2008, 05:16 PM
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no they dont all come with 4.10. Yes going to a 3.73 would help but are you sure you have 4.10s. My 2wd has a 3.73 and turn right @ 2000 rpm at 70mph.
hope this helps
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Old 02-06-2008, 05:18 PM
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Is it a 250 or 350? 350 might have 4.10 in srw but a 250 won't unless someone ordered that way or changed em.
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Old 02-06-2008, 05:35 PM
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Check the VIN

Check your VIN plate against the tables at this site.

It breaks down everything it shipped with from the factory.

If you don't have a forum membership, I can repost it here for ya.
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Old 02-06-2008, 05:41 PM
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You can also check the tag on the rear end, it will tell you factory gearing assuming no one has changed it. You will see 3.73 on the tag and if it is a posi it will be 3L73.
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Old 02-06-2008, 05:47 PM
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No need to do all of that. 2 things... are your RPM's 2000 at 69 mph with stock sized tires?

OR just look at the diff tag on the diff cover. It'll say 3 73 or 3 L73 or 4 10 or 4 L10.

This is on the driver side - it tells you the type of fluid to use.


This is on the passenger side - it tells you "L73" because the bolt is covering the other 3....
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Old 02-06-2008, 06:00 PM
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WHAT GEARS (REAR END) DO YOU GUYS THINK ARE IN A 96 F-250 XLT,NON HEAVY DUTY? ALSO MY REAR END DOESN'T EVEN HAVE LIMITED SLIP, SHOULD I PUT A LOCKER IN HER, OR ANY SUGGESTIONS ON WHAT TO DO AND FROM WHERE (PLACE TO PURCHASE)? I DO NOT HAVE THAT MUCH MONEY SO NEED SOMETHING VERY RELIABLE BUT AFFORDABLE. THANKS
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Old 02-07-2008, 01:04 PM
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Thanks Maintain. And everyone else for your inputs.
I do have 3.73 gears according to the tag BUT it looks like someone has been in there doing something. There is gasket sealer smushed out around the rim, and it is not "sealing" very well either.

What is a common upgrade or change aorund in there? It is not typical for anything in there to break is it? Just wondering why it would look like someone did work in there.

If I am running at 70 my RPM's are a little over 2K. I mean like half of a marking on the stock gauge cluster. So, I would guess that is about 2150 or so.
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Old 02-07-2008, 08:16 PM
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Nobody got any ideas? Or, am I just asking the wrong questions?

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Old 02-08-2008, 04:54 AM
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I dont know of a common change ratio. Usually nothing breaks in the rear end but it may have had new bearings installed or just a fluid change. Those rear ends also come from the factory with sealant and not a gasket I believe.
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