Popping in front end - JeepForum.com
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post #1 of 7 Old 02-18-2019, 07:20 PM Thread Starter
GreenM0nst3rZJ
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Popping in front end

I've had this popping only in 4wd when the tires lose grip, I had the transmission swapped a few months ago and just threw in the 249 that came with it for temporary use . It was a nightmare everytime I took a long half lock turn it would pop pop pop, I then swapped out the input shaft out of the 249 and put it into the 231 that was originally on the jeep .The popping then went away and was perfect until I had to use 4wd in the snow and everytime the tires lost traction and spun It would start popping just like it did with the 249.I'm assuming its the front end since it only happens in 4wd and not the tranfer case ,since it happened with both cases. I haven't removed the diff cover yet ,because I thought I would get some other advice first. Any help is greatly appreciated!

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post #2 of 7 Old 02-18-2019, 10:15 PM
Timo_90xj
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Front axle shaft u-joints or CV joints (depending which ones you have), or spider gears in the front differential.
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post #3 of 7 Old 02-19-2019, 01:42 PM Thread Starter
GreenM0nst3rZJ
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Quote:
Originally Posted by Timo_90xj View Post
Front axle shaft u-joints or CV joints (depending which ones you have), or spider gears in the front differential.
I have U-Joints I replaced the right front about 3 months ago but not the left maybe I should start with that.Thanks!
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post #4 of 7 Old 04-14-2019, 12:00 PM Thread Starter
GreenM0nst3rZJ
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Quote:
Originally Posted by Timo_90xj View Post
Front axle shaft u-joints or CV joints (depending which ones you have), or spider gears in the front differential.
Sorry to revive this old thread ,but i replaced wheel hubs on my jeep the other day and both of the u joints were perfect and absolutely no play but the popping is still there. I also changed the diff fluid last night and checked the inside thoroughly and it was perfect on the inside all gears moved smoothly without any noises. I find it hard to believe that both TC's were bad and I dont know what to check next.
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post #5 of 7 Old 04-15-2019, 03:41 PM
HighLonesome
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Bout all that is left is the front axle halfshafts and driveshaft. Assuming everything is fine when in 2wd. You are not testing 4wd on asphalt right?
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post #6 of 7 Old 04-15-2019, 07:06 PM Thread Starter
GreenM0nst3rZJ
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Originally Posted by HighLonesome View Post
Bout all that is left is the front axle halfshafts and driveshaft. Assuming everything is fine when in 2wd. You are not testing 4wd on asphalt right?
Correct, I'm only testing in loose dirt/mud. I just thought of something, I have a 3in BB on 32's without any TC spacers, It's a longshot ,but could not having spacers cause too much of an angle and create popping.
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post #7 of 7 Old 04-15-2019, 07:18 PM
HighLonesome
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Secondary to what Timo said...

Unlikely. Where you see excessive driveline angles from lifting is the rear, but at 3" you can get them in spec with adjustable control arms. Your front pinion angle could be off, but that would only cause vibes. Maybe the double cardon joint on the front driveshaft is worn, there is a centering pin and bearing that wear and might cause a pop. Guessing here, trying another front driveshaft would be the thing. I keep an old one lying around just for the occasion.
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