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Old 11-05-2013, 12:52 PM   #1
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No clutch with 4L?

On page 5 of this book the author says not to use the clutch when driving a manual in 4L.
http://jeepjamboreeusa.com/common-se...les/index.html

I called I am Jeep to confirm this is "ok" to do. The person who answered the call had to transfer me to someone more technical. This person said always use the clutch or you will damage your jeep

Where can I find out who is right? I would have thought jeepjamboreeusa.com is a legit source of info. But it seems to me that you will burn up your starter if you don't use the clutch.

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Old 11-05-2013, 12:59 PM   #2
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1-877-Iamjeep steered me wrong.... I busted out the manual and found this paragraph

"Four-Wheel Drive Models Only
In 4L mode, this vehicle will start regardless of whether
or not the clutch pedal is pressed to the floor. This feature
enhances off-road performance by allowing the vehicle to
start when in 4L without having to press the clutch pedal"


Now you and I know

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Old 11-05-2013, 01:04 PM   #3
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There are only two cases where you should not use your clutch:

(1) don't shift or use the clutch when driving through mud or water. it can suck up debris into the bell housing. Use first gear. If you get stuck, shut it off, change gear and start it back up in either 1st or reverse without touching the clutch.

(2) don't hold the clutch pedal down with a gear selected going downhill in 4-low. Say you have 1st selected and you depress the clutch to coast downhill. You can build up 10-20 mph easily thinking that you're in neutral. You're not in neutral. The RPM at the clutch will match 1st gear. 20 mph in 1st, 4-low = clutch pieces all over the place.
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Old 11-05-2013, 01:46 PM   #4
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^yup. don't drive it like ur on paved roads. its in out habit trying to use the clutch... before i wheel, i engage 4lo before any obstacles just trying to get a feel for it.
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Old 11-05-2013, 02:02 PM   #5
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You need to read it in context. He is saying to stay in 4L and first gear so that you don't have to risk slipping the clutch or usinf it during a water crossing. Low and slow.
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Old 11-05-2013, 03:31 PM   #6
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He is talking about starting your engine when you have killed it or shut it off on a steep grade or in big rocks.

A Wrangler can be started with the clutch out in low range.

Scenario: you are going up or down a really, really steep grade, as is often found on slickrock terrain in Moab, for example. You kill it, or you have to shut off the engine for some reason. What do you do now? If you push in the clutch and get the vehicle started with one foot holding the clutch down and one foot on the brake, as soon as you take your foot off of the brake the Jeep rolls. On really steep terrain, it can roll 5-10-15 feet before you can get your foot on the accelerator and rev enough to let out the clutch, then it puts a tremendous strain on the driveline to get going.

Instead, be sure you are in low range, and shift to first gear. Leave your foot OFF of the clutch. Put your right foot LIGHTLY (LIGHTLY!) on the accelerator. Crank the starter. The Jeep will start, and you will go without rolling back or forward at all.

99.9% of modern vehicles will not crank the starter with the car in gear and the clutch out. The Jeep will, but only in low range. My 3rd Gen 4Runners would do this, but you had to first push a button on the dash labeled "Clutch Start Cancel".
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Old 11-29-2013, 09:55 PM   #7
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So for those that have used 4L with a manual, does it lurch forward like all other manuals without the clutch or is a certain amount of slippage allowed in 4L first? This would certainly allow for easier rock crawling if it were the case. I have manual but since I haven't received it yet I only have manual to go by.
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Old 11-29-2013, 10:42 PM   #8
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Quote:
Originally Posted by gbez View Post
So for those that have used 4L with a manual, does it lurch forward like all other manuals without the clutch or is a certain amount of slippage allowed in 4L first? This would certainly allow for easier rock crawling if it were the case. I have manual but since I haven't received it yet I only have manual to go by.
Don't know. I always use my clutch. When I do stall it I hold the brake, let out on the clutch and ease off the brake at the same time. I don't ever crank it in gear, when you are standing on your nose or rear bumper you kinda want 100% control. Starting in gear is not going to give you that.

But hey we all do it different.
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Old 11-30-2013, 08:50 AM   #9
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The reason you would do it is because you wouldn't want to use your clutch if your trans was submerged in water.
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Old 11-30-2013, 02:55 PM   #10
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You can absolutely do this, you just don't want to do it in an unnecessary circumstance because it can wear a flat spot in your flywheel. It is EXTREMELY helpful for crawling up an incline, because you want roll backwards. Jeeps have been able to do this for a long time, but the JK is the first one that you didn't have to take a fuse out to do it. I believe in the TJ you have to remove the neutral safety switch fuse and it will have the same effect as a JK.


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Old 11-30-2013, 03:22 PM   #11
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I've done this in a M38A1, CJ7, and YJ but only because I needed to, to get over an obstacle after stalling/shutting down. I wouldn't make it a habit but the Jeep can do it. I've gotten over some large rocks. On my M38A1 I had to do it after putting out an engine fire because gas spilled out of the carb onto the manifold. Yeah it was that steep.
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Old 11-30-2013, 04:58 PM   #12
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Quote:
Jeeps have been able to do this for a long time, but the JK is the first one that you didn't have to take a fuse out to do it.
Well the first in a long time. Not sure when they started adding switches that prevented this, but most of my 4X4's were made prior to such things. I was riding a friend in his 1972 CJ back around 1977 when he lost his clutch linkage rod on a rough trail. We never did find it. He finished the trail and drove 70 miles home without the use of his clutch.

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