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Toyota Sequoia, Toyota Highlander, Toyota 4Runner, Toyota Land Cruiser, Toyota RAV4, Toyota Tacoma, Truck, SUV
#2039 of 2493 Shifting into and out of 4WD
Feb 21, 2007 (12:35 pm)
I have a 1996 Toyota 4Runner Limited. I had it on a trip requiring 4WD in Mexico and had some difficulties and confusion getting into and out of 4WD. I put the car in park and found the 4WD shifter to go in and out of 4WD smoothly some times but not others. When I reached a paved road to go home I shifted the shifter out of 4WD but I am not sure about whether it shifted out at that time. After an eight hour drive I put it in reverse and heard a thud. Is that when it left 4WD. My questions that were not answered clearly when I went to a dealer are: what is the procedure for getting in and out of 4WD? is there a reason the shifter does not always move easily? What was the thud? I have never used an on line forum. Will I get a reply to this in my e-mail? Thank you. johnbakuninccusd.org
#2040 of 2493 Re: Shifting into and out of 4WD [bakunin]
by Stever@Edmunds HOST
Feb 21, 2007 (12:48 pm)
Please come back here to see your replies (having people email you defeats the purpose of having a forum!). You can Track This Discussion and keep up to date on replies easily that way.
There is a box to check when you track a discussion that says "Send me an Email Alert when new messages are posted."
#2041 of 2493 Re: Shifting into and out of 4WD [bakunin]
Feb 21, 2007 (1:05 pm)
Because of the nature of the BEAST, the center locking diff'l sliding spline dog clutch, it is not at all unusual to have problems getting into and/or out of the locked state. Most modern systems have a way of indicating that the diff'l is not in lock when it is supposed to be and vice versa. Most commonly the indicator lite flashes until the dog clutch is engaged or not.
The most common way I found was to drive dead slow while putting it into, or out of, lock or even dead slow in reverse. I know that many manuals indicate that you can shift on the fly but there are MANY exceptions, one of the more common ones is to have slightly different tire wear rates F/R.
#2042 of 2493 Re: 2005 4runner SE - VSC & 4WD [2toyotas]
Feb 21, 2007 (1:34 pm)
I am traveling at the moment, HI, and for some reason I cannot access my techinfo.toyota.com account to review your owners manual.
But I wonder if you're not confusing the AWD mode of your Sequoia vs a true 4WD. Sequoia's AWD mode uses a "soft" locking of the center diff'l so all braking related functions can remain operational. In point of fact it is TC, Traction Control, that is providing this "soft" locking feature, "virtual" center and rear LSD as it were. It may even provide a low level, much lower than at the rear, of virtual LSD functionality at the front diff'l.
#2043 of 2493 Re: Shifting into and out of 4WD [wwest]
Feb 21, 2007 (1:58 pm)
Thank you for the response. I am still not clear. My car has an automatic transmission. I have two shifters. One is for shifting from drive to reverse and to neutral. The other takes me in and out of four wheel drive. I think that you are telling me that the first shifter should be in drive or reverse and that while driving dead slow I should shift the second shifter to 4WD. Am I understanding this? Thank you again.
#2044 of 2493 Re: Shifting into and out of 4WD [bakunin]
Feb 22, 2007 (12:38 am)
First, follow, try the instructions as directed in your owners manual. If that does not work then yes, drive dead slow in drive first, and then try dead slow in reverse until the 4WD clutch locks into 4WD, or unlocks, whichever may be the case.
#2045 of 2493 Locking Center Differential
Feb 28, 2007 (6:19 pm)
Couple questions as this is my first vehicle with this feature:
I understand that you should not use this feature on dry pavement however the manual suggests just avoiding dry pavement. I guess my question is if you lock the differential on dry pavement or while it is locked you hit dry pavement will you harm the system? I would seem odd to me that inadvertant dry pavement use would harm the system.
If traveling in snow or slush and you need more traction does locking the center differential provide more traction?
The manual is unclear on this too, but can you lock and unlock it while moving in H at any speed?
Thanks for the help...
#2046 of 2493 Re: Locking Center Differential [pjc1]
Feb 28, 2007 (6:28 pm)
PS I have a 2006 Land Cruiser
#2047 of 2493 Re: Locking Center Differential [pjc1]
Mar 03, 2007 (2:39 am)
Assuming it works like a 4th generation, full-time 4WD 4Runner - and I'm confident that's the case - I offer the following.
If you lock the center diff on dry pavement, you can stress the driveline, depending on how much turning you do, and possibly harm it. When my 05 4runner was new, I inadvertantly drove 30 freeway miles with the center locked and didn't realize it until I tried to exit the gas station when turning my wheels and feeling a binding. 30k miles later and TONS of hard, off-road use and apparently no damage was done. As far as stress on the system, any time the road surface is slippery to allow wheels to slip slightly and unbind the driveline, the vehicle can be driven safely in center locked mode. If you had to drive it locked on dry pavement, keeping turning to a minimum would be best.
When locked, the center diff will give better traction by defeating VSC which can cut engine power when wheels slip. So snow and ice in normal driving, you would leave the center unlocked so as to benefit from all VSC can do at speed. In unusual cirmumstances - in a ditch, a very deep snow white-out, low traction off-road, etc., locking the diff will make sure your engine power doesn't get cut by VSC but still enables traction control to limit wheel slip, side to side, on the front and back axles.
You can engage the center lock while in motion. Personally, I've never done it going more than 10mph or so but the manual seems to indicate, by omission, that there's no limit on speed.
#2048 of 2493 Re: Locking Center Differential [green]
Mar 03, 2007 (4:54 am)
Green... Thank you.