LOST JEEPS :: View topic - 4 Wheel Drive Shifting Speeds

It's up to 70 but I don't know why you would want to be going 70.

Parakeet

It seems to me that if you can drive safely over 40 mph, you don't need to be in 4 wheel drive. At least in ice and snow.

I thought that when you are in Full Time 4WD (All Wheel Drive) not 4 hi you could go as fast as you wanted. The only difference between that and 2WD is the gears for the front drive shaft in the T-Case are spinning. Don't the axles, front Diff gears, and front drive shaft all spin in 2WD any way?

Now 4 hi is a different story because it locks the center diff spinning the rear and the front at the same speed, and causes wheel hop when turning which can be very dangerous at high speeds, not to mention very bad for the 4WD components.

I could be wrong. Just curious.

shifting your rig in and out of 4hi stopped is hard on it. There are no sycros in the transfer case. It helps to have the Jeep rolling about 2 or 3 miles an hour and 4lo slips right in. With 4h though it's hard on the transfer case to shift in and out of while stopped. It's designed so that you can slip in and out of it as needed up to speeds of 55mph. People are amazed at how easy my KJ slips in and out of 4hi or 4lo.

Parakeet

At those speeds you couldn't possibly put enough torque

contrary to popular belief, 4wd does not help you slow down

trophy trucks (100+ mph offroad.

1stJeepKJ wrote:

Nah I've heard opposite....if you read the manual...in 4WD lo you can't exceed 25mph or you can blow the transfer case...thats why its smart to use 1 and 2 gear w/ Lo...if you have an auto tran. Now in 4WD high thats a different story...because it's part time you can exceed 25 mph or up to 70 or however much you want to...but like others have said....why 70 w/ 4WD? Thats askin for some dangerous conditions! I wouldn't suggest trying to put it in part time (Hi) over 25...doesn't sound too good! I stop when I engage in Hi...Im not taking any chances! And remember to put in neutral when shifting to Lo...you'd be surprised how many people DONT know this! I've seen waaay to many people throw it into 4WD Lo w/ out using Neutral to shift there. Hard on the case!

Author:	AdirondacKJ [ Thu Nov 16, 2006 12:47 am ]
Post subject:	4 Wheel Drive Shifting Speeds
I do a lot of back-country highway driving up in NY state during the winter on icy/snowy roads. Before the winter months begin up here in the Northeast (even though it's been in the mid-60's up here for the past week), I'd like to get something straight about the speeds at which I can shift into and cruise at in 4 wheel drive. I believe Jeep says you can shift the KJ into 4x4 full or part time up to 55mph. Okay, so it's safe for me to shift below 55mph, but can I travel faster than 55 once I have shifted into 4 wheel drive? I've got Selec-Trac WITHOUT a trac-lock differential... if that's even important. Appreciate the input... thanks.

Author:	4wdParakeet [ Thu Nov 16, 2006 1:15 am ]
Post subject:
It's up to 70 but I don't know why you would want to be going 70. Parakeet

Author:	Jeepjeepster [ Thu Nov 16, 2006 1:18 am ]
Post subject:
4wdParakeet wrote: It's up to 70 but I don't know why you would want to be going 70. Parakeet 70? Ive never seen anywhere that says its 70mph? I try to stay below 45mph when shifting. Any yes, its ok to go faster than 55mph while in 4wd. Just make sure you do not use part-time on black-top. Its ok to use Full-time on dry black-top though..

Author:	4wdParakeet [ Thu Nov 16, 2006 1:22 am ]
Post subject:
No I'm sorry that wasn't clear. The max speed in 4wd is 70. Shift into 4wd is 55. Shifting into 4lo is 2mph or so while in neutral. Parakeet

Author:	gunflint [ Thu Nov 16, 2006 7:31 am ]
Post subject:
It seems to me that if you can drive safely over 40 mph, you don't need to be in 4 wheel drive. At least in ice and snow.

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Author:	Blue KJ in PA [ Thu Nov 16, 2006 8:40 am ]
Post subject:
But one might want to hit that mud puddle at 70 for the extra flinging distance. LOL I tend to agree with the rule "If you need 4wd then you really shouldn't be go anywhere close to 55 or 70." Now if I was going to cruise Baja, maybe I'd hit 70mph, but as I cruise the dirt back roads and then snow covered roads in the winter "not gonna do it....wouldn't be prudent"

Author:	AdirondacKJ [ Thu Nov 16, 2006 8:40 am ]
Post subject:
gunflint wrote: It seems to me that if you can drive safely over 40 mph, you don't need to be in 4 wheel drive. At least in ice and snow. You're right... that makes sense. It's more of a precautionary measure if I were to be in 4WD at those high speeds. And I guess I'm just curious... just in case.

Author:	1stJeepKJ [ Thu Nov 16, 2006 8:05 pm ]
Post subject:
I thought that when you are in Full Time 4WD (All Wheel Drive) not 4 hi you could go as fast as you wanted. The only difference between that and 2WD is the gears for the front drive shaft in the T-Case are spinning. Don't the axles, front Diff gears, and front drive shaft all spin in 2WD any way? Now 4 hi is a different story because it locks the center diff spinning the rear and the front at the same speed, and causes wheel hop when turning which can be very dangerous at high speeds, not to mention very bad for the 4WD components. I could be wrong. Just curious.

Author:	FastTRX [ Fri Nov 17, 2006 12:01 am ]
Post subject:
1stJeepKJ wrote: I thought that when you are in Full Time 4WD (All Wheel Drive) not 4 hi you could go as fast as you wanted. The only difference between that and 2WD is the gears for the front drive shaft in the T-Case are spinning. Don't the axles, front Diff gears, and front drive shaft all spin in 2WD any way? Now 4 hi is a different story because it locks the center diff spinning the rear and the front at the same speed, and causes wheel hop when turning which can be very dangerous at high speeds, not to mention very bad for the 4WD components. I could be wrong. Just curious. Nah I've heard opposite....if you read the manual...in 4WD lo you can't exceed 25mph or you can blow the transfer case...thats why its smart to use 1 and 2 gear w/ Lo...if you have an auto tran. Now in 4WD high thats a different story...because it's part time you can exceed 25 mph or up to 70 or however much you want to...but like others have said....why 70 w/ 4WD? Thats askin for some dangerous conditions! I wouldn't suggest trying to put it in part time (Hi) over 25...doesn't sound too good! I stop when I engage in Hi...Im not taking any chances! And remember to put in neutral when shifting to Lo...you'd be surprised how many people DONT know this! I've seen waaay to many people throw it into 4WD Lo w/ out using Neutral to shift there. Hard on the case!

Author:	FastTRX [ Fri Nov 17, 2006 12:04 am ]
Post subject:
Thats for a Command-Trac...I'm not sure about you Selec-Trac people...I'd think its the same but not completely sure. I have the Command-Trac...couldn't find a Selec-Trac in my area so I had to settle w/ it. I'm used to it...but it'd be nice to have 4WD on all the time.

Author:	4wdParakeet [ Fri Nov 17, 2006 12:13 am ]
Post subject:
shifting your rig in and out of 4hi stopped is hard on it. There are no sycros in the transfer case. It helps to have the Jeep rolling about 2 or 3 miles an hour and 4lo slips right in. With 4h though it's hard on the transfer case to shift in and out of while stopped. It's designed so that you can slip in and out of it as needed up to speeds of 55mph. People are amazed at how easy my KJ slips in and out of 4hi or 4lo. Parakeet

Author:	FastTRX [ Fri Nov 17, 2006 12:22 am ]
Post subject:
4wdParakeet wrote: shifting your rig in and out of 4hi stopped is hard on it. There are no sycros in the transfer case. It helps to have the Jeep rolling about 2 or 3 miles an hour and 4lo slips right in. With 4h though it's hard on the transfer case to shift in and out of while stopped. It's designed so that you can slip in and out of it as needed up to speeds of 55mph. People are amazed at how easy my KJ slips in and out of 4hi or 4lo. Parakeet Didn't know that about Hi settings...hmmm...I'll have to watch that next time. I find that its better when you pull it back fast so it clicks in and doesn't make that terrible grinding sound! I rarely ever use 4 Hi..or I haven't as of yet...maybe in snow and what not...but when I'm wheelin' its all in LO. You have Selec-Trac or Command?

Author:	4wdParakeet [ Fri Nov 17, 2006 12:59 am ]
Post subject:
I have the select track. I live on the KS/Mo border and weather can go from sunny and 65 to 6in. of snow quickly. Often as you go from KS to MO roads the snow removal quality deminishes quite quickly. I usually will shift into 4hi upon crossing the state line and only run 40 at the absolute most in snowy conditions. I do run in 4hi during the Midwest summer torentual downpours conditions depending. I will pull it out of 4hi when I reach a parking lot and it's just raining. But on the highway depending on conditions and speeds I will pull it in and out of 4hi should I need it and not feel guilty about hurting the transfer case. Parakeet

Author:	FreedomKJ [ Fri Nov 17, 2006 3:19 am ]
Post subject:
If you're travelling at highway speeds (I'd say 50mph and higher) using 4wd is only going to reduce your gas mileage. At those speeds you couldn't possibly put enough torque to the ground to cause wheel spin, and contrary to popular belief, 4wd does not help you slow down. You only have 4 wheels and 4 brakes, just like every other car on the road. Don't believe me that there's no benefit to 4wd at high speeds? Go look at trophy trucks (100+ mph offroad.) they're all rear-wheel drive only. If 4wd would do them any good they'd use it.

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Author:	LimitedLurker [ Fri Nov 17, 2006 3:49 am ]
Post subject:
I frequently use 4wd on the I in heavy rain or light snow. All I can say is try it. If you have better control use it. If not don't. Quote: At those speeds you couldn't possibly put enough torque In rain/light snow you can hit short sections of low traction. 4wd can prevent the car fram breaking loose and spinning. Quote: contrary to popular belief, 4wd does not help you slow down The only "tests"I've ever seen are from speed to 0 on dry pavement. Not real road conditions. 4wd can help maintain control in marginal/spotty conditions. Quote: trophy trucks (100+ mph offroad. Who cares about what racers are doing off-road when you're making decissions about driving on-road. 2 totally different circumstances and reasons for using 4wd. Just MO based on my personal experiences..

Author:	1stJeepKJ [ Fri Nov 17, 2006 3:28 pm ]
Post subject:
FastTRX wrote: 1stJeepKJ wrote: I thought that when you are in Full Time 4WD (All Wheel Drive) not 4 hi you could go as fast as you wanted. The only difference between that and 2WD is the gears for the front drive shaft in the T-Case are spinning. Don't the axles, front Diff gears, and front drive shaft all spin in 2WD any way? Now 4 hi is a different story because it locks the center diff spinning the rear and the front at the same speed, and causes wheel hop when turning which can be very dangerous at high speeds, not to mention very bad for the 4WD components. I could be wrong. Just curious. Nah I've heard opposite....if you read the manual...in 4WD lo you can't exceed 25mph or you can blow the transfer case...thats why its smart to use 1 and 2 gear w/ Lo...if you have an auto tran. Now in 4WD high thats a different story...because it's part time you can exceed 25 mph or up to 70 or however much you want to...but like others have said....why 70 w/ 4WD? Thats askin for some dangerous conditions! I wouldn't suggest trying to put it in part time (Hi) over 25...doesn't sound too good! I stop when I engage in Hi...Im not taking any chances! And remember to put in neutral when shifting to Lo...you'd be surprised how many people DONT know this! I've seen waaay to many people throw it into 4WD Lo w/ out using Neutral to shift there. Hard on the case! Full Time 4WD is on the selec-trac transfer case, I wasn't talking about 4 lo. 4WD lo you're right not to go any faster than about 25 mph. 4WD hi unless the conditions were really bad i wouldn't be runnning any higher than about 40 mph Full Time 4WD on a Selec-trac T-case, which is basically what subarus and other all wheel drive vehicles have, I don't worry about driving that on the freeway rain or dry or snow or whatever. In fact I prefer that over 4hi in most on road situations. Shifting speeds 45mph or less from 2WD to 4WD Hi or 4WD full time(selec-trac). 2 or 3 mph and transmission in Neutral to shift from any to 4WD lo. Stopping, brakes are brakes regarless of 4WD being in 4WD will not help you slow faster. On that note if you are in 4WD and letting the transmission do the slowing than yes you have more tracking using all 4 wheels but braking with override any and all of that slowing.

Author:	Jeger [ Fri Nov 17, 2006 5:00 pm ]
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I dont know about the liberty but when it is snowy out our tracker stops much better with more control in 4wd than it does in 2wd. I think that when you are in 4wd the other tires that have traction and are turning will help prevent a tire from locking up completely, of course the tracker does not have abs. With 4 wheel abs it probably wont make a difference at all. One other thing to consider, especially at low speeds (in parking lot, or coming up to stop sign) if it seems like you just arent going to be able to stop, try putting it in neutral. With the engine idling in gear it can push enough to make stops take much longer. I would say with the CRD it would be even worse.