4.10 gear wear pattern - Mustang Evolution

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Old 04-04-2012, 02:06 PM   #1
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4.10 gear wear pattern

Nstalling new 4.10 gears and can't seem to get a good wear pattern. I've got good backlash and pinion preload. I measured the new pinion head vs the stock one with a .020 shim and they were within .003 so I didn't shim the new pinion. The stock pinion head with .020 shim was 1.885 and the new pinion head measured 1.888 out of the box. Wondering if I should have used that shim. And if I reshim the pinion flange will that change my backlash .thanks all
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Old 04-04-2012, 03:29 PM   #2
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Re: 4.10 gear wear pattern

Shimming the pinion will push it farther into the ring gear?
You really need to check it with a pinion depth gauge, but you might try the shim and see if that doesn't produce a better pattern for you.
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Old 04-04-2012, 03:38 PM   #3
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i think you may be also able to shim the ring side of the carrier toward the pinion.make sure you take the same amount out of the other side.
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Old 04-05-2012, 09:32 PM   #4
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So I got a decent pattern what do some of you gear experts think. And have .012 of backlash
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Old 04-05-2012, 09:43 PM   #5
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Re: 4.10 gear wear pattern

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So I got a decent pattern what do some of you gear experts think. And have .012 of backlash
Looks pretty good, center of tooth contact appears ok from what I can see in the pics.


Is the .012 backlash within specs?
If so, then you should be good to go.
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Old 04-08-2012, 06:13 PM   #6
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4.10 gears all installed. Test drove it and no whine or any kinds of noise. Didn't get on it but feels great once they are broken in it'll get fun. Only problem is I see a drip from the pinion shaft seal. Can I change it's out by unbolting the driveshaft an changing to out by unbolting the pinion but and changing it or do I have to take the whole thing apart?
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Old 04-08-2012, 06:29 PM   #7
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If its just the pinion seal you should be able to unbolt the DS, take the big nut off the yoke on the rear, take the yoke off and use a screwdriver to pop out the hold seal and put in the new one then do everything you just undid in reverse
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Old 04-08-2012, 06:40 PM   #8
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Any chance someone's seen one start a leak then seal itself? I really don't feel like getting under my car for a while.
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Old 04-08-2012, 06:41 PM   #9
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it may quit leaking when you get the fluid low enough.but i wouldnt do that.lol
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Old 04-08-2012, 06:44 PM   #10
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Re: 4.10 gear wear pattern

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4.10 gears all installed. Test drove it and no whine or any kinds of noise. Didn't get on it but feels great once they are broken in it'll get fun. Only problem is I see a drip from the pinion shaft seal. Can I change it's out by unbolting the driveshaft an changing to out by unbolting the pinion but and changing it or do I have to take the whole thing apart?
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If its just the pinion seal you should be able to unbolt the DS, take the big nut off the yoke on the rear, take the yoke off and use a screwdriver to pop out the hold seal and put in the new one then do everything you just undid in reverse
Every time I have removed a pinion nut from an assembled rearend I have had problems getting it reinstalled and torqued properly without affecting the gear set up.
Once the crush collar is crushed it's difficult to get everything back in place properly.
You would also need to install a new nut as they are only meant to be tightened up and used once. You may end up having to redo the whole thing again.


If you installed a new seal and pre-lubricated it, give it a bit of time to seat in and see what happens before attempting to change it out.
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Old 04-08-2012, 06:47 PM   #11
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Well I won't do that. I'll be tearing into it ASAP again

---------- Post added at 06:47 PM ---------- Previous post was at 06:44 PM ----------

It s not leaking from the rubbe seal where the pinion rides its the seat on the axle where it was tapped in. I tapped it in as gentle and easy as possible and still a small leak. The seating surface was in good shape too. Just my luck
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Old 04-08-2012, 06:50 PM   #12
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Quote:
Originally Posted by Cm644rodrigues
Well I won't do that. I'll be tearing into it ASAP again

---------- Post added at 06:47 PM ---------- Previous post was at 06:44 PM ----------

It s not leaking from the rubbe seal where the pinion rides its the seat on the axle where it was tapped in. I tapped it in as gentle and easy as possible and still a small leak. The seating surface was in good shape too. Just my luck
I would just run it for a while but just keep an eye when you've driven it then let it sit for a while. Like Trojan said, it may seal up after some drive time. But if it gets worse def take a look into fixing it.
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Old 04-08-2012, 07:04 PM   #13
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Aside that leak gear install went smooth and being my first

---------- Post added at 07:04 PM ---------- Previous post was at 07:03 PM ----------

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Aside that leak gear install went smooth and being my first
It was a lot easier than all my buddies let on to be
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Old 04-08-2012, 07:24 PM   #14
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i thought so when i did mine.its not so bad.just a little tedious.
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Old 04-08-2012, 07:27 PM   #15
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Re: 4.10 gear wear pattern

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Aside that leak gear install went smooth and being my first

---------- Post added at 07:04 PM ---------- Previous post was at 07:03 PM ----------



It was a lot easier than all my buddies let on to be
For "DIY".
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Old 04-08-2012, 07:33 PM   #16
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Yup DIY is the only way especially when saving money comes into play plus it's fin
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Old 04-08-2012, 08:48 PM   #17
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Would some rub around the seal and seat work.
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Old 04-08-2012, 09:22 PM   #18
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Re: 4.10 gear wear pattern

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Would some rub around the seal and seat work.
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Old 04-09-2012, 08:14 AM   #19
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Rtv sorry stupid autocorrect thought I was trying to say rub haha
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Old 04-09-2012, 03:47 PM   #20
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Re: 4.10 gear wear pattern

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Rtv sorry stupid autocorrect thought I was trying to say rub haha
Ok, my brain wouldn't process that.
Some silicone sealer may help, can you maybe tap around the outer edge of the seal and try to seat it in more too?

Be sure to clean all of the oil off first.
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Old 04-09-2012, 10:07 PM   #21
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No noise= Great job
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