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Old 01-18-2013, 04:55 PM   #1
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JK Manual lurching in snow

After it snowed here recently I thought I'd try my 2013 JK Sport S 6-speed to see if it could tackle about 7 inches of the stuff.

I went to a new development where there was a completely unplowed road and went onto it, put the transmission in 4WD Low. Starting in 1st gear it would start but then lurch, and I could not seem to control it. Even with my feet off the clutch and gas it would go, slip, go, slip, go, slip, in a very disconcerting manner.

The Jeep is stock with 17" stock tires.

Any recommendations as to if I'm doing something wrong?
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Old 01-18-2013, 05:00 PM   #2
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maybe try to start in 2nd or even 3rd.

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Old 01-18-2013, 05:28 PM   #3
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I am trying to follow what you are explaining, but I am not seeing it.

What I do is:
  1. Stop and push clutch in.
  2. Engage 4low on xfercase
  3. Put tranny in 1st or 2nd gear
  4. Slowly let clutch out and feather the throttle to keep tires from slipping in snow/ice.
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Old 01-18-2013, 06:14 PM   #4
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I think maybe as the tires go forward they pack the snow down underneath, making it hard and more slippery, then slips a little til it grabs again, etc.

Next time I try it I'll have my gf take a video so maybe I can see how the tires are slipping and lurching. It may be just a side effect of the specific gear and snow depth; I think I did try 2nd, maybe 3rd would have worked to keep the speed up past the tipping point. Or maybe 4W Hi instead. After the initial deeper snow when the depth was more like 4-5" it seemed to not be an issue.

Another factor may be the tires, 255/75R17 (32") but the treads do not appear to be all that aggressive...
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Old 01-18-2013, 09:54 PM   #5
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What kind of tires came with your Jeep? I would also try it again on a plowed dirt road to see if you get the same results.

Normal 4 L action would have you crawl at a good even pace with no lurching.
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Old 01-18-2013, 11:35 PM   #6
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I think it's your traction control, my 09 4 door was terrible in deep snow with the TC on. When the pcm detects wheel spin it backs off the throttle until the spinning stops, then the throttle opens up again and the sequence repeats. I had to turn my TC off to drive in deep snow.
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Old 01-19-2013, 01:12 AM   #7
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Quote:
Originally Posted by Wheelerbob
I think it's your traction control, my 09 4 door was terrible in deep snow with the TC on. When the pcm detects wheel spin it backs off the throttle until the spinning stops, then the throttle opens up again and the sequence repeats. I had to turn my TC off to drive in deep snow.
Isn't ESC off in 4W Lo?
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Old 01-19-2013, 01:17 AM   #8
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Quote:
Originally Posted by Maritimer
What kind of tires came with your Jeep? I would also try it again on a plowed dirt road to see if you get the same results.

Normal 4 L action would have you crawl at a good even pace with no lurching.
Goodyear Wranglers? I'll check tomorrow...

I've been 4-wheeling on logging roads and trails without issue so far, only was weird like that in the snow.
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Old 01-20-2013, 08:03 AM   #9
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Went out yesterday, that road still had about 4" on it in spots, but I could not recreate the issue. I think that lurching was just a side effect of the specific snow conditions, will try again next time we get deep snow (looks like maybe Tuesday).
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Old 01-20-2013, 09:45 AM   #10
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I would go with traction control as well...not the every day ESC, but a part of it.

One feature of traction control is BLD. (Brake Lock Differential).....that was probably it.

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