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Old 12-29-2014, 07:30 PM
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Help! Slipping in front somewhere.

Just bought 05 grand cherokee 5.7 hemi 4x4. I've fixed nearly all the clunks and issues. But...

From park it feels like something is slipping then catches as I transition forward. Occasionally will clunk when it catches. Seems more aggravated when moving into a turn. Only light on is ABS and service 4 wheel drive. Code is u 1417 for left speed sensor.

Also the odometer is only counting about half the miles but speedometer is unaffected.

Recently I've replaced front diff mount and bushings. Driver wheel hub and CV axle. Passenger wheel hub. Thermostat. EGR valve.

Can't afford to keep throwing parts at it. Any ideas?


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Old 12-30-2014, 12:21 AM
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Re: Help! Slipping in front somewhere.

Start with the wheel speed sensor. This could cause your problem, and the computer is already telling you it is bad.

Not too bad of a job and a relatively cheap part.


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Old 12-30-2014, 09:05 AM
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Re: Help! Slipping in front somewhere.

I have replaced the speed sensor at the wheel and the light remains. From what I've read that's a problem with these things. It's on my to so list but I don't see how that can be the cause of mechanical resistance/lurching etc


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Old 12-31-2014, 07:55 AM
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Re: Help! Slipping in front somewhere.

I had the same u1417 code that pointed to only the left front wheel. You need to find a shop that can read all the codes. I also had a code associated with the left rear speed sensor that was defective but did not post to the DIC readout. Replaced both front wheel hubs/sensors and the left rear sensor and problem "service 4 wheel/service ABS" has been clear for a few months.

Front clunk - not sure what front diff isolator bushings you replaced, but there are 3 total. The clunk on my 05 was from the center isolator bushing.
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Old 12-31-2014, 10:35 AM
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Re: Help! Slipping in front somewhere.

Thanks I am planning on replacing the rear sensor next when I get home. I'm on the road and from what I've read its a chore on this thing.

The bushings I replaced where all three. It no longer clunks when shifting to drive now. This is more in the front tires and only happens from cold. After it does its thing it's usually good the rest of the drive.

I guess I'll replace the passenger cv axle next as its the only thing there that isn't new. Minus the differential and I'm hoping it isn't internal and doesn't seem to match those kind of symptoms.


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Old 12-31-2014, 12:20 PM
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Re: Help! Slipping in front somewhere.

Have you recently changed the fluids in the front and rear axles and transfer case? These are normally 30,000 mile service items. Without the proper diff fluid and friction modifier what you describe as slippage can occur. Same for using the correct transfer case fluid.
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Old 12-31-2014, 02:39 PM
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Re: Help! Slipping in front somewhere.

That had occurred to me. I recently bought it and can't be certain what was done to it before. I'm going to change the oil before heading home and thinking of doing that too.

I replaced the front diff fluid when I changed the bushings. I used royal purple with additive recommended by auto parts shop


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Old 12-31-2014, 09:37 PM
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Re: Help! Slipping in front somewhere.

The subject of using aftermarket vs. OEM diff and transfer case fluids usually ends up a beating a dead horse fest on these forums.

I can't speak for the aftermarket stuff since for the most part I've stuck with the Mopar fluids in all my previous Jeeps as with the current ones and feel it has provided a high degree of assurance that these critical driveline components are protected and functioning properly.
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Old 01-05-2015, 11:17 AM
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Re: Help! Slipping in front somewhere.

Quote:
Originally Posted by jdmm08 View Post
I have replaced the speed sensor at the wheel and the light remains. From what I've read that's a problem with these things. It's on my to so list but I don't see how that can be the cause of mechanical resistance/lurching etc


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If the wheel speed sensors are providing improper input, they can cause all sorts of havoc with the traction control system. This can indeed cause mechanical resistance (especially if the brakes are being applied!) and lurching.

Not saying that is your problem, and the other suggestions you received in this thread are all good as well (especially fluid quality). Just that I would start by fixing what you know isn't right and see what's left before trying to troubleshoot.
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Old 01-07-2015, 10:37 AM
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Re: Help! Slipping in front somewhere.

All good suggestions. I put in additive yesterday, too soon to tell if it's done any good and the speed sensor arrives today. I'll give it a few days and update with results. Thanks.


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Old 01-08-2015, 10:21 PM
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Re: Help! Slipping in front somewhere.

I have a 06 GC Limited w/5.7 and Quadra-drive II. It is my understanding that if you disengage the traction control by pressing the button with the skid marks ( with accompanying dash light), you can see if this changes the " clunking " and isolate the traction control from the other systems. This could help diagnose the problem.


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