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Old 09-13-2012, 09:01 PM   #1
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Tranny/Differential poping in 4 low.

I was just out doing some mudding with my friends when I shifted into 4 low in a nice sized mud hole. The tranny or differential didnt like it one bit. It started making a poping sound like gears were rubbing together. I know 4 wheel drive vehicles do this when you take sharp turns cause it puts the rear wheels in a bind but I've never had it happen going straight.

My diff is a little low on fluid so I'm gonna change it soon but I wouldn't think that would affect it. If anyone has had any experience on this issue or has an idea on how to fix it I would be grateful.

Oh btw like a month or 2 ago it wouldn't shift into 4high or low I pulled so hard I broke the control arm underneath the jeep and had to replace it. Then one day I stopped on the road randomly and it shifted no problem.

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Old 09-13-2012, 09:04 PM   #2
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How fast are you going when you shift between 2hi and 4hi and 4HI to 4lo?

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Old 09-13-2012, 09:08 PM   #3
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Completly stopped or it grinds the gears. It's not a grinding sound it a poping. If you go put you jeep in 4low and take the sharpest turn possible you'll know the sound I'm taking about. I was just going straight when it happened.
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Old 09-14-2012, 12:20 AM   #4
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I wonder if you could have damaged your front diff spider gears or ring/pinion gears. Does it only happen in 4lo?
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Old 09-14-2012, 05:56 AM   #5
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Nah. Both high and low. Idk what to do, winters coming and i would like to have 4 wheel
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Old 09-14-2012, 08:14 AM   #6
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Quote:
Originally Posted by jeepwayoflife View Post
I wonder if you could have damaged your front diff spider gears or ring/pinion gears. Does it only happen in 4lo?

I agree, Sounds like diff... Just had mine replaced - was popping / clicking when turning in 2WD / 4WD. Is it happening in 2WD as well? Rebuild can cost upwards of $1200+, depending on what it is. I had the front diff completely rebuilt, new gears, seals, fluid, and all for $700 from a mechanic friend of mine - mainly just to cover beer / parts.
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Old 09-14-2012, 08:53 AM   #7
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I agree, Sounds like diff... Just had mine replaced - was popping / clicking when turning in 2WD / 4WD. Is it happening in 2WD as well? Rebuild can cost upwards of $1200+, depending on what it is. I had the front diff completely rebuilt, new gears, seals, fluid, and all for $700 from a mechanic friend of mine - mainly just to cover beer / parts.
I love how you paid for beer not labor! Haha. No its only in 4 wheel.

Its got and extremely low amount off diff fluid so I think I'll drain what's left of it tonight and replace then take it out for another run and see how it checks out.
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Old 09-14-2012, 09:18 AM   #8
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If its only in 4wheel it leads me to believe there is something wrong with the front diff. There is only torque being applied in 4wd, so it would make sense. I would pop the cover and inspect the gears to be sure
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Old 09-14-2012, 09:23 AM   #9
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Since you are going to add some fluid anyway, it definitely wouldn't hurt to pop the cover as jeepwayoflife suggested... You can look for broken / chipped gears, and any metal shavings that way. Let us know what you find...
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Old 09-18-2012, 11:31 AM   #10
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Replaced the diff fluid and pinion seal with absolutely no problem. Everything looked to be in working order and no problems that I could distinguish. Took it up a hill a couple of hours later. Still poping.
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Old 09-25-2012, 06:14 PM   #11
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Found out what it was. It's the transfer case chain slipping. It's stretching out and skipping teeth on the gears in the t case. Making the clank sound. Watched some videos and I think I'm ready to tear into this thing! I think I'm gonna install an sye while I'm at it.

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