Rear gear ratio 2003 ford f-150 supercrew

[Ford Fan#1]

It says 26 on the code so a 3.73 limited slip and another one says something else

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On the internet

[Jersey_Joe]

I'm pretty sure your truck has the same rear my 03 had. A 9.75 sterling locker 3.73. They made a ton of em

[Ford Fan#1]

If it wines does that mean it needs replaced or the gears need replaced or oiled?

[RhinoZ24]

Well changing the rear differential oil would be a good place to start, it will also give you a chance to inspect the gears as well.

[Ford Fan#1]

That's what I was thinking

[Jersey_Joe]

If it wines does that mean it needs replaced or the gears need replaced or oiled?
Could b your pinion gear. Mine went. She wined somethin terrible. I changed the fluid and it got worse Remember. Changing the fluid lets out all the fine peices of metal that r holding it together. If she's whinning. It could b your pinion gears. Changing the fluid could actually make it worse. U can get em online. And it's an easy job to change em. Should take about 2 hrs start to finish

[alfie]

If it's a grear whine. Ring and pinion both have to be changes as they are mated together. Also. Before u remove them. Check the mesh pattern and see if the gears are properly set up. If they are not sounds like u will need to reshim. But the factory shims are a good place to start.

So real fast. Check current pattern.

Install me gears.

Check pattern. (Re shim if it's off)

A good trick I do is grind the instide if the pinion bearing to allow ease of removal and instal. That way u don't have to use a press every time u want a different pinion shim. Pinion shim help the pinion seat further in or out of the ring gear.


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[Ford Fan#1]

Ok thanks I'll do that when ( if ) I get to change the gear oil over spring break or summer.

[Ford Fan#1]

Here's some proof with the open differential :) https://instagram.com/p/3rfZpcnD-y/