Driving in 4Hi
#1
Registered User
Thread Starter
Join Date: Sep 2003
Location: ON/Canada
Posts: 121
Likes: 0
Received 0 Likes
on
0 Posts
Driving in 4Hi
Search is down so I am not sure if there is any write-ups on this.
I know it says you can't drive on Hard Dry surfaces in 4Hi in the manual, and someone even told me that I can't use my 4Hi on the Highway even with some snow on it...... Is this true?
What kinda of damage would occur if you drove on Hard Dry surfaces anyway?
I know it says you can't drive on Hard Dry surfaces in 4Hi in the manual, and someone even told me that I can't use my 4Hi on the Highway even with some snow on it...... Is this true?
What kinda of damage would occur if you drove on Hard Dry surfaces anyway?
#2
You can drive in 4 High on or offroad. If you do use it on pavment can can wreck your gears and stuff. But in snow and etc 4 high you can turn it on / off at low speeds as long as your hubs are locked.
#4
Registered User
Join Date: Mar 2003
Location: Parker, Colorado
Posts: 1,564
Likes: 0
Received 0 Likes
on
0 Posts
For highway you shouldn't need 4hi. At those speeds you don't need 4wd, in fact alot of people don't use it past 25-30mph. Transmission damage will incur if you drive past 50mph in 4hi. I use 4hi only up to 35mph, and thats only on unplowed roads because I have a pickup and usually don't have weight in the back, but 4runners have better weight over the rear axles.
As far as hard packed concrete, your front wheels need to have some slippage or else it is a large strain on your drivetrain components (drive shaft and CV's I believe).
EDIT: And you don't have to worry about your hubs being locked, unless you've switched your 96 to manual hubs, but these came standard on earlier models
As far as hard packed concrete, your front wheels need to have some slippage or else it is a large strain on your drivetrain components (drive shaft and CV's I believe).
EDIT: And you don't have to worry about your hubs being locked, unless you've switched your 96 to manual hubs, but these came standard on earlier models
Last edited by Plays_with_Toys; 01-15-2004 at 10:31 AM.
#5
Re: Driving in 4Hi
Originally posted by Sass69
and someone even told me that I can't use my 4Hi on the Highway even with some snow on it...... Is this true?
and someone even told me that I can't use my 4Hi on the Highway even with some snow on it...... Is this true?
What kinda of damage would occur if you drove on Hard Dry surfaces anyway?
Last edited by rimpainter.com; 01-15-2004 at 10:34 AM.
#7
Originally posted by Breezey
My book says dont go over 55 in 4 High... I use it on the highway in the snow.. Me truck drives like its on rails hehe
My book says dont go over 55 in 4 High... I use it on the highway in the snow.. Me truck drives like its on rails hehe
Trending Topics
#9
Registered User
Join Date: Jan 2004
Location: Fargo, ND
Posts: 134
Likes: 0
Received 0 Likes
on
0 Posts
I swear my manual said nothing about limiting speed, only that you must be going under 50 to engage it. It said you can disengage at any speed.
At least that's the way I read it, I may have to check again.
At least that's the way I read it, I may have to check again.
#10
Registered User
Thread Starter
Join Date: Sep 2003
Location: ON/Canada
Posts: 121
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Phil
I swear my manual said nothing about limiting speed, only that you must be going under 50 to engage it. It said you can disengage at any speed.
At least that's the way I read it, I may have to check again.
I swear my manual said nothing about limiting speed, only that you must be going under 50 to engage it. It said you can disengage at any speed.
At least that's the way I read it, I may have to check again.
I didn't read anything about max speeds though.
#11
Contributing Member
Join Date: Dec 2002
Location: Phoenix, AZ
Posts: 1,998
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Phil
I swear my manual said nothing about limiting speed, only that you must be going under 50 to engage it. It said you can disengage at any speed.
At least that's the way I read it, I may have to check again.
I swear my manual said nothing about limiting speed, only that you must be going under 50 to engage it. It said you can disengage at any speed.
At least that's the way I read it, I may have to check again.
#12
Registered User
Thread Starter
Join Date: Sep 2003
Location: ON/Canada
Posts: 121
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Plays_with_Toys
For highway you shouldn't need 4hi. At those speeds you don't need 4wd, in fact alot of people don't use it past 25-30mph. Transmission damage will incur if you drive past 50mph in 4hi. I use 4hi only up to 35mph, and thats only on unplowed roads because I have a pickup and usually don't have weight in the back, but 4runners have better weight over the rear axles.
As far as hard packed concrete, your front wheels need to have some slippage or else it is a large strain on your drivetrain components (drive shaft and CV's I believe).
EDIT: And you don't have to worry about your hubs being locked, unless you've switched your 96 to manual hubs, but these came standard on earlier models
For highway you shouldn't need 4hi. At those speeds you don't need 4wd, in fact alot of people don't use it past 25-30mph. Transmission damage will incur if you drive past 50mph in 4hi. I use 4hi only up to 35mph, and thats only on unplowed roads because I have a pickup and usually don't have weight in the back, but 4runners have better weight over the rear axles.
As far as hard packed concrete, your front wheels need to have some slippage or else it is a large strain on your drivetrain components (drive shaft and CV's I believe).
EDIT: And you don't have to worry about your hubs being locked, unless you've switched your 96 to manual hubs, but these came standard on earlier models
Honestly...its night and day with 4wd on the highway, even better under braking conditions. Especially when I pass all the 2wd vehicles !!!! This is all when there is snow on the highway of course.
Last edited by Sass69; 01-15-2004 at 11:18 AM.
#13
In my Tacoma , I used to drive accross the salt flats in 4 high around 125MPH or so.. and never had any problems.. I think you just have to be in low speeds to put it in 4 wheel high..
#14
Registered User
Join Date: Apr 2003
Location: San Diego, CA
Posts: 917
Likes: 0
Received 0 Likes
on
0 Posts
Re: Re: Driving in 4Hi
Originally posted by <96 Runner>
The damage occurs from turning. You can wreck the gears in the front diff, etc.
The damage occurs from turning. You can wreck the gears in the front diff, etc.
#15
Contributing Member
Join Date: Dec 2003
Location: boston, ma
Posts: 6,729
Likes: 0
Received 0 Likes
on
0 Posts
so no one knows if this is still true for 2001+?
i was under the impression theyd changed the system in 2001 making it able to be on at any time at any speed, able to turn, etc.
i was under the impression theyd changed the system in 2001 making it able to be on at any time at any speed, able to turn, etc.
#17
Registered User
Thread Starter
Join Date: Sep 2003
Location: ON/Canada
Posts: 121
Likes: 0
Received 0 Likes
on
0 Posts
4wd
It sure seems that there are a variety of different answers or opinions. This makes me nervous as I have been driving in 4hi on and off for the past 2 days. I checked the card on the visor, it doesn't say anything about max speeds etc.. It only states the speed at which you should engage or disengage.
I will check the manual tonight...anyone have theirs handy right now?
:pat:
I will check the manual tonight...anyone have theirs handy right now?
:pat:
#18
Re: Re: Re: Driving in 4Hi
Originally posted by OneTrickToy
You sure? I thought this is only the case in locked differentials. Stock fronts are open. Turning shouldn't be the issue but binding of the front axle in relation to the rear would be an issue. Since a hand transfer case(actual 4wd not AWD) would be the same as having the center locked. Correct me if I'm wrong.
You sure? I thought this is only the case in locked differentials. Stock fronts are open. Turning shouldn't be the issue but binding of the front axle in relation to the rear would be an issue. Since a hand transfer case(actual 4wd not AWD) would be the same as having the center locked. Correct me if I'm wrong.
I am not exactly sure what that is doing, but I have heard it puts excess pressure on the diffs.
#19
Registered User
Thread Starter
Join Date: Sep 2003
Location: ON/Canada
Posts: 121
Likes: 0
Received 0 Likes
on
0 Posts
Re: Re: Re: Re: Driving in 4Hi
Originally posted by <96 Runner>
I think the added pressure when the transfer case is engaged causes the damage I am talking about. Ever tried to turn in 4HI and felt that binding and heard the tire skidding?
I am not exactly sure what that is doing, but I have heard it puts excess pressure on the diffs.
I think the added pressure when the transfer case is engaged causes the damage I am talking about. Ever tried to turn in 4HI and felt that binding and heard the tire skidding?
I am not exactly sure what that is doing, but I have heard it puts excess pressure on the diffs.
#20
Registered User
The facts
A locker is irrelavent. Part time 4WD biases 50% of torque to the front and 50% to the rear driveshafts. The problem is that without a center diff or a VSC the wheel travel front and rear must be the same to not cause stress on the parts. You are only in danger from the third members back. When you turn, EVERY wheel takes its own path. Try it in fresh snow and look. Because of this in 4WD the two driveshafts cannot rotate the same ammount without tire slippage. The slippage is what keeps the shafts from twisting off or other damage occuring. In mud and snow the tires slip easily. On highly tractive surfaces they cannot. The damage will not be sudden, if you were to try to cause damage it would take a while but it can and will happen.