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Old 03-26-2011, 10:54 AM   #1
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The 1-2 crunch

Ok the 6spd has never been smooth shifting but recently, the shift from first to second has resulted in a crunch ... It runs a cringe up my spine. When warmed up, it's fine,but in the first 5 miles or so cold, I want to start in 2nd to avoid the gnashing. Recently also, I thought I was pulling my shifter out of first gear on acceleration - I have read ad nauseum the thread on popping out of gear but am still really not quite sure it's a defect, or I am pulling it out of the gate on acceleration(it happens so rarely)

So has anyone else found the 1-2 crunch?

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Old 04-01-2011, 01:46 PM   #2
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Yeah, the crunch really gets sickening. I even switched out my fluid to Redline MTL synthetic and it seemed a little better but not really.

I usually start out in 2nd all the time now. If you want to keep using 1st, try hesitating for almost a full second in neutral before completing your shift to 2nd. Another trick I like to use is when I shift out of first I move the stick to the right between 5/6 and then quickly back to the left and down into 2nd. Its usually much smoother of a shift and is done in less than a second.

Warm weather is your friend

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Old 04-01-2011, 02:52 PM   #3
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Here's what I do when it's cold....

Start the JK several minutes before your departure time, put the transfer case in neutral, put the tranny in 4th-5th-6th(doesn't matter which) let out the clutch, grab a cup of joe and when you are done with the coffee, the tranny will be warmed up nicely...
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Old 04-01-2011, 03:27 PM   #4
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So it's NOT just me? The thing crunches ... And yes it makes me sick so I usually just start in 2nd when cold. Ok ... Thanks gents for the input
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Old 04-01-2011, 04:02 PM   #5
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I can honestly say that I've never had this issue, I always warm her up and shift rather slow...what are you taching to when you shift?
Have you tried a slower shift?

Looks like you have a real nice rig, keep in mind that the NV3550 is a truck tranny....
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Old 04-03-2011, 04:10 AM   #6
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Same problem here, but it happens while shifting into 2nd AND 5th, and of course, the stealership didn't find anything.
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Old 04-04-2011, 09:24 AM   #7
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Oh man this is a problem - I mean it only happens when cold, otherwise it shifts like butter - same thing with the 1st gear JOG, so I simply start off in 2nd (which with 5.13's is a better choice anyway)

OK maybe the crunch is related to the JOG that has been discussed ad nauseum in other posts - we'll see I guess
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Old 04-04-2011, 09:34 AM   #8
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Mine did it also all winter but it doesn't do it as much when you gear it in reverse the day before. (I read this tip from someone on this forum)
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Old 04-04-2011, 02:07 PM   #9
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Has anyone tried double clutching? I haven't had this happen to me yet but maybe that would work?
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Old 04-04-2011, 02:12 PM   #10
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Quote:
Originally Posted by jkjeeper06 View Post
Has anyone tried double clutching? I haven't had this happen to me yet but maybe that would work?
If double clutching is using the clutch to go from first to neutral then clutching again from neutral to second then I just realized that that's what I do when it's too cold so you're probably right it must help.
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Old 04-04-2011, 08:27 PM   #11
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Yeah sometimes I double clutch as well when it's still cold.

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