4wd shift on the fly? - JeepForum.com

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post #1 of 20 Old 02-20-2014, 05:57 PM Thread Starter
djbckr
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4wd shift on the fly?

I just got a 1988 Wrangler and it didn't come with a manual. Does anybody know if it's safe to shift into 4wd while moving, or is it best to be stopped before shifting. Also same question for shift from 4H to 4L. I'd love it if I could find a standard operating manual for this year's model. Anybody know where I could find one? (I have the Haynes repair manual)

Thanks in advance!

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post #2 of 20 Old 02-20-2014, 06:06 PM
ThreeToe
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Hey, my manual says it's safe to shift into 4H at speeds of 50 mph or less. I usually try to do it at slower speeds, and I always shift into neutral first and hold the clutch in. I've never had a problem. For 4L it says to be doing less than 5mph if I remember correctly. Just be barely moving for 4L.
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post #3 of 20 Old 02-20-2014, 06:13 PM
baritone_mike
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word for word from my 88 YJ owners manual

4H Position
This position is designed for temporary use of 4-wheel drive for traction when driving in rain, snow, mud, sand, or when driving off road. Do not use 4H on dry, paved roads. To engage, shift the transfer case lever from 2H to 4H while the vehicle is moving at any legal speed.

4L Position
This position is designed for temporary use of 4-wheel drive when off-road driving conditions require added low speed pulling power. Do not use 4L on dry paved roads.
To engage, slow the vehicle to 2-3mph (3-5 km/h), shift the transmission to Neutral (N), then shift the transfer case lever to the right and pull firmly rearward to 4L.

CAUTION: Never attempt to engage Low range when vehicle is moving faster than 2-3 mph (3-5 km/h). Transfer case damage may result.

My words:

(note that in 1988 the highest legal speed limit in the US was 65mph)

When l put it into 4 high, I just make sure I am driving in a straight line and am not accelerating when I go to engage it. For 4 low I always come to a complete stop and either put it in neutral or push the clutch in. When I take it out of 4 low I always come to a complete stop. From 4 high to 2wd I do nothing special.

˙ɹǝʌo ɹǝʇndɯoɔ ɹnoʎ dılɟ sıɥʇ pɐǝɹ uɐɔ noʎ ɟı
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post #4 of 20 Old 02-20-2014, 06:32 PM Thread Starter
djbckr
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Thanks guys, I really appreciate that.
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post #5 of 20 Old 02-21-2014, 10:29 AM
bigbossd1030
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Quote:
Originally Posted by baritone_mike
word for word from my 88 YJ owners manual 4H Position This position is designed for temporary use of 4-wheel drive for traction when driving in rain, snow, mud, sand, or when driving off road. Do not use 4H on dry, paved roads. To engage, shift the transfer case lever from 2H to 4H while the vehicle is moving at any legal speed. 4L Position This position is designed for temporary use of 4-wheel drive when off-road driving conditions require added low speed pulling power. Do not use 4L on dry paved roads. To engage, slow the vehicle to 2-3mph (3-5 km/h), shift the transmission to Neutral (N), then shift the transfer case lever to the right and pull firmly rearward to 4L. CAUTION: Never attempt to engage Low range when vehicle is moving faster than 2-3 mph (3-5 km/h). Transfer case damage may result. My words: (note that in 1988 the highest legal speed limit in the US was 65mph) When l put it into 4 high, I just make sure I am driving in a straight line and am not accelerating when I go to engage it. For 4 low I always come to a complete stop and either put it in neutral or push the clutch in. When I take it out of 4 low I always come to a complete stop. From 4 high to 2wd I do nothing special.
This x100

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post #6 of 20 Old 02-21-2014, 11:28 AM
Apollo12227
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Quote:
Originally Posted by djbckr View Post
I just got a 1988 Wrangler and it didn't come with a manual. Does anybody know if it's safe to shift into 4wd while moving, or is it best to be stopped before shifting. Also same question for shift from 4H to 4L. I'd love it if I could find a standard operating manual for this year's model. Anybody know where I could find one? (I have the Haynes repair manual)

Thanks in advance!
http://www.jeepforum.com/forum/f12/w...ft-fly-949926/
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post #7 of 20 Old 02-21-2014, 11:29 AM
Apollo12227
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Quote:
Originally Posted by ThreeToe View Post
Hey, my manual says it's safe to shift into 4H at speeds of 50 mph or less. I usually try to do it at slower speeds, and I always shift into neutral first and hold the clutch in. I've never had a problem. For 4L it says to be doing less than 5mph if I remember correctly. Just be barely moving for 4L.
"Any Legal Speed" is the instruction for 4HI engagement on low traction surfaces.
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post #8 of 20 Old 02-21-2014, 11:50 AM
grandboost98
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Ive never been able to shift into 4hi over 25-30mph. You just hear the CAD grinding till you slow down. The guy at work who just got a YJ asked me and I told him 4hi at any speed and he said he couldnt for the same reason. It doesnt really bother me because when I need 4wd, I usually start off in it rather than shift between 2hi and 4hi but it annoyed him because hes used to his newer truck

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post #9 of 20 Old 02-21-2014, 12:45 PM
bigbossd1030
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There are problems if you can't. I can switch at 110km/h. No problem.

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

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post #10 of 20 Old 02-21-2014, 01:31 PM
Anticanman
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Quote:
Originally Posted by bigbossd1030 View Post
There are problems if you can't. I can switch at 110km/h. No problem.
I can do it in 12 parsecs.

Luck Favours The Prepared
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post #11 of 20 Old 02-21-2014, 01:38 PM
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I've even done it at .... Ludicrous speed.

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post #12 of 20 Old 02-21-2014, 01:53 PM
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post #13 of 20 Old 02-21-2014, 03:21 PM
bigbossd1030
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Oh god. What did I do!

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

OFFICIAL JEEPER
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post #14 of 20 Old 02-21-2014, 04:09 PM
Anticanman
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Quote:
Originally Posted by bigbossd1030 View Post
Oh god. What did I do!
We ain't too kind to folks talkin metric.

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post #15 of 20 Old 02-21-2014, 04:17 PM
Apollo12227
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Quote:
Originally Posted by grandboost98 View Post
Ive never been able to shift into 4hi over 25-30mph. You just hear the CAD grinding till you slow down. The guy at work who just got a YJ asked me and I told him 4hi at any speed and he said he couldnt for the same reason. It doesnt really bother me because when I need 4wd, I usually start off in it rather than shift between 2hi and 4hi but it annoyed him because hes used to his newer truck
2 people makes a majority not.... Sorry mate. Thousands of YJ's out there can shift to 4wd HI at any legal speed.

Fix that cad!
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