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Old 10-17-2011, 03:04 PM   #1
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manual transmission question

hey guys, i was wondering if anyone could answer this: what is the point of being able to start your jeep without depressing the clutch, while in 4lo?

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Old 10-17-2011, 03:12 PM   #2
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Under water/mud

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Old 10-17-2011, 03:14 PM   #3
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Under water/mud
Yep..^^ the last thing you want to do is engage the clutch in mud/water...
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Old 10-17-2011, 04:14 PM   #4
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so then to rock the car back in forth lets say in mud or water, you can just switch it to rev also without clutch? can u start the jeep without clutch in rev?

thanks
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Old 10-17-2011, 04:18 PM   #5
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I'm curious about this as well. I heard something about being able to start car in gear without clutch but I have no clue how this works. Are you saying in 4-Lo you leave it in gear and simply start the vehicle w/o depressing the clutch? Wouldn't it lurch forward in that case? Confused....
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Old 10-17-2011, 05:08 PM   #6
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I'm curious about this as well. I heard something about being able to start car in gear without clutch but I have no clue how this works. Are you saying in 4-Lo you leave it in gear and simply start the vehicle w/o depressing the clutch? Wouldn't it lurch forward in that case? Confused....
Yes it does, it lurches mildly once.
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Old 10-17-2011, 05:14 PM   #7
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Quote:
Originally Posted by mavrick
so then to rock the car back in forth lets say in mud or water, you can just switch it to rev also without clutch? can u start the jeep without clutch in rev?

thanks
Quote:
Originally Posted by ShoreWrangler
I'm curious about this as well. I heard something about being able to start car in gear without clutch but I have no clue how this works. Are you saying in 4-Lo you leave it in gear and simply start the vehicle w/o depressing the clutch? Wouldn't it lurch forward in that case? Confused....
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Old 10-17-2011, 06:25 PM   #8
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Originally Posted by mavrick View Post
so then to rock the car back in forth lets say in mud or water, you can just switch it to rev also without clutch? can u start the jeep without clutch in rev?

thanks
Negative.
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Old 10-17-2011, 09:02 PM   #9
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I think the better question would be why one would NOT want to be able to start without depressing the clutch. Once upon a time you could do this, and every so often it came in handy.
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Old 10-17-2011, 10:00 PM   #10
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I thought it was primarily meant for starting on an incline, so that the Jeep won't roll backwards. But I guess starting underwater would be another use.
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Old 10-17-2011, 10:02 PM   #11
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HSA handles starting on a hill.
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Old 10-17-2011, 10:32 PM   #12
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Old 10-17-2011, 10:43 PM   #13
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I just replace a clutch in the summer on my YJ because my neighbor who sold it to me thought the clutch was bad....he even included the clutch kit with the wicked good sales price. When we I pulled the transmission we found poor little mousy deceased at the bottom of the bell housing and his home had been ransacked! I pulled the pressure plate off of the flywheel and set it on my sidewalk steps. Neighbor comes over and looks at the pressure plate and says, "that ain't right". the diaphragm looked like an inny instead of an outty. Upon further inspection, all of the grass that the mouse had brought in to make its "home" had been sucked in and forced behind the diaphragm while the clutch was depressed and then the diaphragm would no longer release because the grass was jammed in there. I was pretty impressed with it. It got me to thinking about why it happened. Looking at the shape of the clutch plate with its spiraled grooves, it must create quite a disturbance of the air in the bell housing. Now, take air out of there and put water/mud in there......start to see the picture? All of that agitating and all that mud, it will get jammed in there just like the grass did. Can't be a good thing. Not to mention the friction will help to prematurely wear the clutch plate. If the clutch began to operate strangely after a romp in the mud, it may be worth pulling the transmission and hitting the parts with a pressure stream from a hose or a pressure washer.
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Old 10-18-2011, 01:25 AM   #14
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So if you are underwater/mud, you would simply switch to 4lo while in gear and continue forward while continuing to give the Wrangler more gas? And is it 4lo or 4hi that you have to be completely stopped for? I know one you can switch to while moving, but have to be going something like 2 mph (basically a stop!)
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Old 10-18-2011, 01:33 AM   #15
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So if you are underwater/mud, you would simply switch to 4lo while in gear and continue forward while continuing to give the Wrangler more gas? And is it 4lo or 4hi that you have to be completely stopped for? I know one you can switch to while moving, but have to be going something like 2 mph (basically a stop!)
My understanding is that you can switch into 4hi going up to 55mph. Jeep recommends switching into 4lo going 2 to 3mph so the gears will engage. Hope that answers your question.
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Old 10-18-2011, 05:49 AM   #16
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Originally Posted by rivershark2005

My understanding is that you can switch into 4hi going up to 55mph. Jeep recommends switching into 4lo going 2 to 3mph so the gears will engage. Hope that answers your question.
You are correct. You can try going 4lo from a stop, if it does not engage--don't force it--rolling will help the gears align.
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Old 10-18-2011, 05:58 AM   #17
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So if you are underwater/mud, you would simply switch to 4lo while in gear and continue forward while continuing to give the Wrangler more gas? And is it 4lo or 4hi that you have to be completely stopped for? I know one you can switch to while moving, but have to be going something like 2 mph (basically a stop!)
You need to already be in 4L. That's why I always say you should be in it before you need it. It's also where the term Lo and Slow comes from when going through water. Save the big splashes for the kids.
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Old 10-18-2011, 06:46 AM   #18
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All driving through deep water and mud MUST be done without use of the clutch. It is best to make it all the way across in one run. If you need to come to a stop however, just shut off the ignition. The vehicle will stop instantly. To back up, shift into reverse while the engine is off and start the ignition. Roll back to desired spot, then shut off ignition. Shift into first, start engine, and go.
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Old 10-18-2011, 07:00 AM   #19
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Jeep recommends switching into 4lo going 2 to 3mph so the gears will engage. Hope that answers your question.
Do you do this while in gear? Should you depress the clutch while doing this?

How about automatics? Switch to neutral or leave in gear?
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Old 10-18-2011, 07:15 AM   #20
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4H to 4L or 4L to 4H
With the vehicle rolling at 2 to 3 mph (3 to 5 km/h), shift
an automatic transmission into NEUTRAL (N), or press
the clutch pedal on a manual transmission. While the
vehicle is coasting at 2 to 3 mph (3 to 5 km/h), shift the
transfer case lever firmly to the desired position. Do not
pause with the transfer case in N (Neutral).
NOTE:
Shifting into or out of 4L is possible with the
vehicle completely stopped; however, difficulty may occur
due to the mating teeth not being properly aligned.
Several attempts may be required for clutch teeth alignment
and shift completion to occur. The preferred
method is with the vehicle rolling at 2 to 3 mph (3 to
5 km/h). Avoid attempting to engage or disengage 4L
with the vehicle moving faster than 2 to 3 mph (3 to

5 km/h).
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Old 10-18-2011, 07:23 AM   #21
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4H to 4L or 4L to 4H

With the vehicle rolling at 2 to 3 mph (3 to 5 km/h), shift
an automatic transmission into NEUTRAL (N), or press
the clutch pedal on a manual transmission. While the
vehicle is coasting at 2 to 3 mph (3 to 5 km/h), shift the
transfer case lever firmly to the desired position. Do not
pause with the transfer case in N (Neutral).


NOTE:
Shifting into or out of 4L is possible with the
vehicle completely stopped; however, difficulty may occur
due to the mating teeth not being properly aligned.
Several attempts may be required for clutch teeth alignment
and shift completion to occur. The preferred
method is with the vehicle rolling at 2 to 3 mph (3 to
5 km/h). Avoid attempting to engage or disengage 4L
with the vehicle moving faster than 2 to 3 mph (3 to
5 km/h).


Thanks Tom. That answers my question.


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