another possible drive line vibe question

Ok got me a dial indicator and some gear marking compound. Getting ready to pop the cover and investigate this gear set up.

From what I have read I should be looking for backlash of .006-.010 with the difference between the highest and lowest along the gear no more than .003. (Essentially no more than. 003 of run out) I also plan on putting the dial indicator on the side of the ring gear and rotate it all the way through to check run out.

I don't have an inch pound torque wrench to check the pinion preload though but maybe tomorrow I'll go buy a beam style one to check pre load.

Sound like I'm on the right track?
 
desertrunner said:
Ok got me a dial indicator and some gear marking compound. Getting ready to pop the cover and investigate this gear set up.

From what I have read I should be looking for backlash of .006-.010 with the difference between the highest and lowest along the gear no more than .003. (Essentially no more than. 003 of run out) I also plan on putting the dial indicator on the side of the ring gear and rotate it all the way through to check run out.

I don't have an inch pound torque wrench to check the pinion preload though but maybe tomorrow I'll go buy a beam style one to check pre load.

Sound like I'm on the right track?
Click to expand...

We're getting ready to regear ours and the specs I got from 3 different sources is .006-.010 for backlash. As far as runout, I do not know but .002-.003 is standard on axle flanges, so that sounds good for the carrier/ring gear.

You cannot accurately check pinion bearing preload with the carrier and axles still installed.if you don't feel play, I wouldn't worry about it for now.
 
Kinda hard to tell with this blue shit nappa had but the tread pattern looks good to me
 

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desertrunner said:
Kinda hard to tell with this blue shit nappa had but the tread pattern looks good to me
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That's your coast side and it looks perfect. Check the drive side. You need to put some resistance on the ring gear as you turn the pinion. Either wedge a block of wood in there or wear a thick glove and hold it with your hand as you turn the pinion. You want to try to create the gears being under load for a more accurate witness mark on the pattern.
 
WJCO said:
That's your coast side and it looks perfect. Check the drive side. You need to put some resistance on the ring gear as you turn the pinion. Either wedge a block of wood in there or wear a thick glove and hold it with your hand as you turn the pinion. You want to try to create the gears being under load for a more accurate witness mark on the pattern.
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Damn it I had a 50/50 shot at picking the right side Haha, sounds good I'll do that and see what I get.

Trying to get an accurate measurement on backlash and it's looking like it's between. 007 and .009 so little on the loose side but within spec
 
Well I'm not positive if this is the issue but I did find something a bit strange. I put the dial indicator on the side of the ring gear and spun the pinion and it looks like (if i did it correctly) that I have about .004 of run out. Check out the attached video and see what you think.

https://youtu.be/yxhX2xuyoTM
 
Gear pattern is spot on. Backlash is .007-.009 in the 2 spots I checked. The only thing I can find is by running that dial indicator along the back side of the ring gear I'm getting .004 of run out (see video above) which seems like a lot to me considering most of the YouTube videos I watch are at like .0015

So at this point I'm thinking it's either too much run out on the ring gear (if I measured right) or something to do with the drive shaft and the fact that it is spinning so much faster now.
 

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I'm going to measure it again and make sure I'm still getting the same number but could that .004" of run out give me that harmonic vibe? I read somewhere the stock spec is .005" but not sure how that would affect a bigger gear set
 
desertrunner said:
Holy shit i think I found it!!!!
The video below is my driveshaft yoke, over 1mm out of round. Idk what the tolerance is on it but that's about .04" and most the tolerancence I have found for other things were .005"

https://youtu.be/W1s1955AgeI
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I think you're supposed to take that measurement on the face where it bolts to the driveshaft, and not the outer circumference.
 
havent re measured yet BUT while i was out i hit a few parts stores and no one could even find the right part in their computers, i managed to find a rear pinion yoke on rock auto for $34 but they are out of stock. i even caved in and went to the dealership but they wanted $161 for the damn thing!!!! F that i would rather buy a new aftermarket shaft. Anyone know where to find a stock rear pinion yoke? or have one laying around after an upgrade?
 
desertrunner said:
havent re measured yet BUT while i was out i hit a few parts stores and no one could even find the right part in their computers, i managed to find a rear pinion yoke on rock auto for $34 but they are out of stock. i even caved in and went to the dealership but they wanted $161 for the damn thing!!!! F that i would rather buy a new aftermarket shaft. Anyone know where to find a stock rear pinion yoke? or have one laying around after an upgrade?
Click to expand...
Are you talking about this?

https://www.quadratec.com/p/omix-ad...nge-07-17-jeep-wrangler-wrangler-unlimited-jk

--
Build thread: The Adventures of Fiona
https://wayalife.com/showthread.php?t=47407
 
BaddestCross said:
Are you talking about this?

https://www.quadratec.com/p/omix-ad...nge-07-17-jeep-wrangler-wrangler-unlimited-jk

--
Build thread: The Adventures of Fiona
https://wayalife.com/showthread.php?t=47407
Click to expand...

So I took a look at that link again and that part doesn't make sense. The stock front shaft pinion side bolts on with 4 big bolts not the 8 little ones. The stock front driveshaft on the transfer case side has the small 8 bolts which actually makes me think I wonder if I can try my old stock transfer case yoke on the rear axle. Not sure if the spline counts are the same but it fits the drive shaft CV joint.
 
try a junk yard, no guarantee on quality of the part but as long as the donor isn't a mangled mess should be pretty straight forward
 
So I ran the dial indicator along the face of the yoke like WJCO mentioned and I still found about .030" of run out I also found what looks like a ding in the yoke where you can even see the where it makes the face stick out a little. I wonder if that is what is causing my vibe.
 

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