How fast can I go in 4WD Hi?? - JeepForum.com

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post #1 of 26 Old 04-20-2004, 04:38 PM Thread Starter
gsdz28
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How fast can I go in 4WD Hi??

How fast and how long can I safely go in 4Wd high???

like if it's raining pretty hard outside does that make a difference?? someone told me the water splashing on the rear end/transfer case would help keep it cool.

and i don't have a owners manual


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post #2 of 26 Old 04-20-2004, 04:42 PM
chris06
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Quote:
Originally Posted by gsdz28
How fast and how long can I safely go in 4Wd high???

like if it's raining pretty hard outside does that make a difference?? someone told me the water splashing on the rear end/transfer case would help keep it cool.

and i don't have a owners manual
55mph
2wd will be fine in rain.
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post #3 of 26 Old 04-20-2004, 04:52 PM Thread Starter
gsdz28
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Quote:
Originally Posted by chris06
55mph
2wd will be fine in rain.
actually i have been having a bad time slipping and sliding and the tires are brand new!

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post #4 of 26 Old 04-20-2004, 05:01 PM
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Quote:
Originally Posted by gsdz28
actually i have been having a bad time slipping and sliding and the tires are brand new!
It is actually normal for tires to slide a little in the rain when they are brand new. Tires need to be scuffed a little before you get full traction on them..

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post #5 of 26 Old 04-20-2004, 06:11 PM
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0 mph is good if you go any faster on pavment you can hurt the t-case if you have select track it is no prob but comand track is. the problem is that the front and rear tires move at different speeds when turning and you bind the gears/belt in the t-case if you have comand track. if there is snow or ice it is a different.

o i sound kinda stupid saying this but i might have the comand and select track mixed up


(edit) hahah somehow i am in the tj forum u guys might have different t-cases. sory no clue how i got in here o well

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post #6 of 26 Old 04-20-2004, 06:15 PM
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Owners manual says 55 I do beleive. I've had mine up to 75 a few times when I forgot to shift out of 4wd high. It wont damage anything but will increase the wear since it cant slip like on ice or snow. What tires do you have? You shouldnt be getting that much slipping in rain that 4wd high is needed.

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post #7 of 26 Old 04-20-2004, 06:36 PM
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I got the "welcome kit" from Jeep a few weeks ago. In it is the Winter edition of the Jeep owner's magazin as well as a 10 page leaflet called "Living The Jeep Life" which contains among other things, "Trail Rated/4WD Tips".

There's a chart regarding the different 4wd systems and what surfaces you'd use them for.

For CommandTrac (TJ), RockTrac (Rubi only) and SelecTrac (XJ+) it says you can use 4H in **Wet Pavement**, Gravel, or Snow.

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post #8 of 26 Old 04-20-2004, 06:39 PM
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I'm going to have to disagree--Unless DC started something new, all TJ's come with the NP231, which is a part time unit. So you should not drive it on pavement unless you really want to blow your Tcase apart. The reasoning is that when in $WD a part time unit basically locks the front and rear driveshafts together. Which equates to them spinning at the same speed period. When cornering your inside tires will turn slower than the outside and cause a difference in speeds of axle shafts which will in turn either blow a diff or shoot up into the Tcase. I don't want to sound belittling or condesending but I really would not want anyone blowing their TCase apart.
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post #9 of 26 Old 04-20-2004, 06:56 PM
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SO, what kind of tires are they?
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post #10 of 26 Old 04-20-2004, 07:00 PM
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The tj owners manual says that you can shift into or out of 4wd hi at any legal speed. So, I guess you can take it up to 65-70mph.

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post #11 of 26 Old 04-20-2004, 07:09 PM
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Quote:
Originally Posted by ctavel
I'm going to have to disagree--Unless DC started something new, all TJ's come with the NP231, which is a part time unit. So you should not drive it on pavement unless you really want to blow your Tcase apart. The reasoning is that when in $WD a part time unit basically locks the front and rear driveshafts together. Which equates to them spinning at the same speed period. When cornering your inside tires will turn slower than the outside and cause a difference in speeds of axle shafts which will in turn either blow a diff or shoot up into the Tcase. I don't want to sound belittling or condesending but I really would not want anyone blowing their TCase apart.
Yeah, I know how it works.. I'm just writing what it says - not that I believe them. Don't shoot the messenger..

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post #12 of 26 Old 04-20-2004, 10:43 PM
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If you can safely do 55 with 4wd engaged, you don't need 4wd. All 4wd does is to help you to get going. It doesn't do a damn thing for stopping or turning. In fact, skids are easier to recover in 2wd than in 4wd.

Also, rain on paved roads does not provide sufficient slippage to prevent damage to the t-case. You can use it when taking off from a red light or tollbooth or whatever, but once you're moving, put it back into 2wd. Continuous driving will cause windup and damage. Even in the snow, I rarely keep it in 4hi. I'll use it to get going, then shift back to 2hi.
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post #13 of 26 Old 04-21-2004, 04:21 AM
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Quote:
Originally Posted by PrfctAggression
If you can safely do 55 with 4wd engaged, you don't need 4wd. All 4wd does is to help you to get going. It doesn't do a damn thing for stopping or turning. In fact, skids are easier to recover in 2wd than in 4wd.

Also, rain on paved roads does not provide sufficient slippage to prevent damage to the t-case. You can use it when taking off from a red light or tollbooth or whatever, but once you're moving, put it back into 2wd. Continuous driving will cause windup and damage. Even in the snow, I rarely keep it in 4hi. I'll use it to get going, then shift back to 2hi.
I agree, if you feel you can go 55 in 4WD, then you should have it in 2WD. If it is raining hard enough for you to slip and slide, SLOW DOWN. You may be more comfortable in 4WD so you think you can go faster, but your brakes still work the same as any car out there, you always have 4 wheel stop, 4WD does not make you stop faster. Sorry about the rant, little rage left over last winter from a Bronco totaling my neon and the kid telling me it was my fault because I wasn't going fast enough when I decided to stop for the tree that fell out of the truck in front of me. Direct quote to the officer and me.
"I had it in 4WD, he's only got front wheel drive, I can go faster in the snow. That is why he was able to stop and I wasn't."
This made the officer laugh, but it wasn't funny enough to make up for him totalling my car, its OK now cause my SRT-4 rocks

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post #14 of 26 Old 04-21-2004, 06:46 AM
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Driving in 4wd on a hard surface is not going to make anything explode. It will accelerate wear on the tires and to a lesser extent on the transfer case and differentials.
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post #15 of 26 Old 04-21-2004, 09:01 AM
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Actually the U-joints are likely to go first, they're the weak link. Driving with 4 wheel engaged on hard surfaces puts a lot of stress on the drivetrain. As for wet, rainy roads, I just slow down.

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