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Old 06-10-2007, 10:31 AM   #1
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63-79 Differential Yoke inspection

I see and get a lot of questions on wore yokes in an otherwise good differential. Guys find a lot of endplay~over .050" and want to repalce the yokes,seals,and bearings. If the yokes are worn a lot then all the metal grinding dust is in the oil, bearings, gears,ect- I would rebuild the unit in most cases and that is outlined in the "sticky" post.
This is for you guys who are not comfortable tearing down the diff, whether this is from lack of tools, work room or just don't want to do it.
First you have to see if the yokes will tap out. I use a long brass rod to drive them out but one in a while they are mushroomed pretty good and you're not going to drive them out. In that case you have to grind the ends and remove them. Try to use something to catch the chips. The seals will pry out but unless you have a 3 jaw slide hammer that will grab the bearings I would leave them in. They last a long time and as long as they feel ok leave them alone. Don't expect the new yokes to take up endplay to the point I fit them, probably not going to happed with a stock posi setup.


Here is a good one to look at. I had to grind this one out,but I was rebuilding the whole thing.



Here are the 90* snap ring pliers I use. These were given to me in 1977 when I was a kid rebuilding Bridgeport Mills. I haven't seen one like this in years. The ones Sears have aren't bad but most I see are junk.




Ground end




I always fit my jobs here I'm grinding a new yoke to fit the endplay to .005"







Done




Here you have the seal tool you can make from any junk screw driver you find for a $1 at the flea market.











Have Fun, I'd still rebuild it if it were mine, but you're the boss.
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Old 06-14-2007, 03:38 PM   #2
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Bringing this back up I was asked about it on another forum- that I no longer post pictures on. Can one of you make it a sticky so it doesn't get lost.
Thanks
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Old 06-14-2007, 05:49 PM   #3
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Quote:
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Bringing this back up I was asked about it on another forum- that I no longer post pictures on. Can one of you make it a sticky so it doesn't get lost.
Thanks
Will do

Great reference material!!
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Old 08-10-2007, 08:37 PM   #4
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I have about .25" of end play
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Old 08-10-2007, 09:08 PM   #5
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I have about .25" of end play
I smell trouble. Did you check it with the halfshafts removed?
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Old 08-10-2007, 10:44 PM   #6
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I smell trouble. Did you check it with the halfshafts removed?
Yeah. I have the whole diff out.

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Old 08-11-2007, 08:18 AM   #7
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Chris, that is a lot of end play you got there. Since it is out of the car, I would open it up and check what is going on...but that is me. If you decide you are not going to do anything with it, then it only cost you RTV, a gasket and a little time.

I had less end play than that when I inspected my differential and it turned out one of the yokes was slightly mushroomed. Both were significantly less than the approximately .187 from the snap ring to the top that is normal for new. Of course, I ran into a cracked case......

You might want to start a new thread on this..........Edit, just saw the new thread.
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Old 11-16-2007, 12:05 PM   #8
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Here something to check with rebuilt yokes, and I'll post this on the rebuild post as well.

I had some come in that were rebuild poorly and the splines didn't line up. Now most of the time this doesn't happen but if you're like me and buy parts to use in a year or more then look at them when you get them.

Here is the end of the yoke. You can see he tip is not aligned and this would not fit in the side gear unless it was hammered in. Maybe some do that as well



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Old 11-16-2007, 01:52 PM   #9
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Gary, Have you ever seen a new yoke or a rebuilt yoke that after installation still has to much clearance. If you have what is the fix for this, or is there a fix.

Mine will probably come back out this winter just for a check and see how it all looks. I have about 2K miles on it since rebuild but it has been a hard 2K.
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Old 11-16-2007, 01:53 PM   #10
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Gary, Have you ever seen a new yoke or a rebuilt yoke that after installation still has to much clearance. If you have what is the fix for this, or is there a fix.
Shim the clutch pack
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Old 11-16-2007, 02:28 PM   #11
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The kids correct. If the posi is a stock spring setup then you may have too much play in the posi. How much yoke endplay do you have, .030-.040"?

With a tuned posi then I usually I have to face grind the yokes to set the endplay between .005-.010".
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Old 11-16-2007, 02:32 PM   #12
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The kids correct. If the posi is a stock spring setup then you may have too much play in the posi. How much yoke endplay do you have, .030-.040"?

With a tuned posi then I usually I have to face grind the yokes to set the endplay between .005-.010".

I really don't remember what the end play was. I am pretty sure I was at about .010 but I will check it all out this winter when it is on the bench/stand.

If you are already tight by tuning the posi and the clutch pack is shimmed to get the right preload is it possible to still have to much clearance? You just can't gp throwing more shims in the clutch pack. It does not sound like you have run into this and I'm not saying I do have this but just curious.
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Old 11-16-2007, 03:08 PM   #13
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Gordon,
With regards to tuning the posi, you tune it to set up the spiders not the yokes. I have had new yokes come in that were loose but they were out of range. I can't say spec because I never found a published spec for yoke face to snap ring but I use .187 +/- .005" I had some come in .170-.175 and returned them. You are correct on shimming the spiders, you can only go so far until they bind and then you have to back off .005 or grind to size like I do. With yokes in the .182- .190 range with a tuned posi they usually fall in the .000-.003 endplay range. That is why I have to grind them. Again, no spec but I like to set them at .005-.010"
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Old 11-16-2007, 03:38 PM   #14
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Gordon,
With regards to tuning the posi, you tune it to set up the spiders not the yokes. I have had new yokes come in that were loose but they were out of range. I can't say spec because I never found a published spec for yoke face to snap ring but I use .187 +/- .005" I had some come in .170-.175 and returned them. You are correct on shimming the spiders, you can only go so far until they bind and then you have to back off .005 or grind to size like I do. With yokes in the .182- .190 range with a tuned posi they usually fall in the .000-.003 endplay range. That is why I have to grind them. Again, no spec but I like to set them at .005-.010"

I was really just curious on this subject as I know you have done a lot of them. It really does not apply to my setup as I removed the snap rings all together due to the 6 link setup I have in mine. I'll get in touch with you this winter if I have or show any signs of strange happenings inside the diff. Thanks again.
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Old 11-16-2007, 03:42 PM   #15
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Ok Gordon you know where I am. How much do you think the yokes float with the 6 link?
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