4wd and first gear not holding - JeepForum.com

 
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post #1 of 9 Old 12-26-2011, 05:49 PM Thread Starter
ehouli
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2011 KK Liberty 
 
Join Date: Dec 2011
Location: Caracas
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4wd and first gear not holding

Hi there!

I'm new to the forum and a newbie with Jeeps. I got 2011 KK, and decided to try it yesterday at the mountain.

Climbing up it's really good, but coming down, I wasn't pleased, I already had the truck in 4wd Low, I engaged 1st gear and began descending, the road is roughly paved but in good shape so I just needed the engine and transmission to hold the vehicle when coming down the steep hill, which didn't happen exactly, I found my self using the brakes more than I wanted and the engine easily revving up to 5000 rpms, after all that the brakes got a little overheated. I've driven Toyotas, Chevys and Fords before and this didn't happen to me before. A peer at work has a 2007 Grand Cherokee and he tells me that he didn't have that problem at the same place, but he needed to use 3rd gear as the 1st and 2nd were too short.

What experience do you have under similar conditions? Is this the normal?

Sorry for the long post and thanks for your help

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post #2 of 9 Old 12-26-2011, 06:07 PM
Jeepin11
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Join Date: Mar 2011
Location: Utica
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The liberties come with hill descent control. You have to be in 4lo to engage it. There is a button right next to the four way flasher button. Trust me it works. But you shouldn't be in 4wheel on pavement anyways. Really not good for your drive train.

2011 KK- 265/75-16 Wrangler Authorities on 16x8 Racelin Assault wheels
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post #3 of 9 Old 12-26-2011, 06:22 PM Thread Starter
ehouli
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Quote:
Originally Posted by Jeepin11 View Post
The liberties come with hill descent control. You have to be in 4lo to engage it. There is a button right next to the four way flasher button. Trust me it works. But you shouldn't be in 4wheel on pavement anyways. Really not good for your drive train.
Thanks Jeepin11 for your help, my understanding is that the HDC should be used when you have to go down a hill in really bad conditions and need to go very slow, can it be used for long periods of time?

In this mountain you have to engage 4wd low because the hill is very steep( 30 degrees easily) and it takes you around 20 to 30 minutes to go down at around 10 to 15 mph, else you're going to get seriously injured
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post #4 of 9 Old 12-27-2011, 10:40 AM
Sagerist
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1989 YJ Wrangler 
 
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I have never had any issues with my hill descent control and use it a lot when 4-wheeling. although the fastest speed you can go with hill descent, i believe, is 7mph in D. Probably too slow.

Colorado Jeep Club Member #286
89 YJ 2.5L
OME 36R's, Bilstein 5100's, Bserk 5/8" shackles, 33x10.5 BFG's on 15x8

09 KK Sport 4X4
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post #5 of 9 Old 01-08-2012, 09:14 AM Thread Starter
ehouli
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Join Date: Dec 2011
Location: Caracas
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Hey Happy New Year!!!

Today I'm going back to the mountain and will make a video so you can see what happens when coming downhill... If I find other KKs up there I'll ask them how they go downhill.

Cheers,

Erick
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post #6 of 9 Old 01-08-2012, 09:24 AM
streetglideok
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Did you leave the gear selector in D, or drop it down to low? Remember the faster your vehicle goes, the exponentially more power it takes to slow it down. Regardless of HDC working or not, you need to know how to safely go down grades without such devices. They dont always work as planned. If the system doesnt seem capable to control vehicle speed on its own, then you need to go that much slower. If that means creeping down, then that is what you do. I know KK owners dont really have stick shift options, but, I prefer manual trannys for going down grades over autos any day.
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post #7 of 9 Old 01-09-2012, 07:13 AM Thread Starter
ehouli
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Quote:
Originally Posted by streetglideok View Post
Did you leave the gear selector in D, or drop it down to low? Remember the faster your vehicle goes, the exponentially more power it takes to slow it down. Regardless of HDC working or not, you need to know how to safely go down grades without such devices. They dont always work as planned. If the system doesnt seem capable to control vehicle speed on its own, then you need to go that much slower. If that means creeping down, then that is what you do. I know KK owners dont really have stick shift options, but, I prefer manual trannys for going down grades over autos any day.
I'd never go downhill on D, of course I did use 1st gear to begin the descent. Yesterday I did on purpose begin at 0 mph and let it go slowly, what happens is that it holds well between 1000 and 2000 RPM, after 2000 RPM it just slips away and goes up to 5,000 rpm and almost 15mph which is too fast for a high grade slope downhill.

This is not my first 4x4, I've had 3 with auto transmissions and one manua transmission, and none of them gave a hard time.
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post #8 of 9 Old 01-09-2012, 06:03 PM
streetglideok
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How much braking effort are you using to maintain a safe speed? Even with jake brakes on big trucks, we have to use air brakes to maintain speed control going down grades. The key is to not rely totally on the engine itself.
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post #9 of 9 Old 01-09-2012, 06:10 PM
tjkj2002
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The HDC can only do so much and the 42RLE trans sucks with it's very high 1st gear ratio.


Either reagear with lower gears or scrape the OEM t-case with one with at least 4:1 low range.Adding the Rubicrawler to your KK might work also.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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