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Old 01-10-2011, 08:57 AM   #1
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noob at 4wd

what is the proper steps to go from 2wheel drive to 4wd and visa versa? my is a 6speed manual.

what speed, do you have to be stopped?...etc...

also heard that you should be in 4wd in a year to proper lube the truck? true?

thanks
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Old 01-10-2011, 09:00 AM   #2
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Just let off the gas and switch it to 4. Let it engage and your good to go. Same goes for taking it out. If your 4wd doesn't go in throw it in nutreul and it should go in.
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Old 01-10-2011, 09:02 AM   #3
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Can engage and disengage at 55 mph and below anytime needed. Good to engage once in a while to check and ensure 4wd is working.
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Old 01-10-2011, 11:02 AM   #4
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toyota says go in 4wd at least driving for 10miles per month for proper maint...really?...i live in the city...where do i drive for this?...thought its bad to turn 4wd with dry pavement?
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Old 01-10-2011, 11:06 AM   #5
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Quote:
Originally Posted by mrdinh View Post
toyota says go in 4wd at least driving for 10miles per month for proper maint...really?...i live in the city...where do i drive for this?...thought its bad to turn 4wd with dry pavement?

Hummm Ive never heard that. From what I understand on are trucks you are always turning the front diff components. 4wd just transfers power to those components.
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Old 01-10-2011, 11:34 AM   #6
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Quote:
Originally Posted by JLee View Post
Hummm Ive never heard that. From what I understand on are trucks you are always turning the front diff components. 4wd just transfers power to those components.
No, you have an ADD (which like automatic locking hubs) frees up wear and drag of the front drive parts when you are in 2WD.

It is not good to use 4WD on dry pavement if you turn... since the front and back tires need to rotate differently and in 4WD they cannot... if the ground is slippery than they can without binding.

If you must, only go into 4WD on pavement during rain... and if it never rains, make sure you do so only when driving straight (to lube the parts).
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Old 01-10-2011, 11:38 AM   #7
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After you get into 4wd stop, push the clutch in and hold the brake the select low. If it beeps you did something wrong. Look in the manual.
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Old 01-10-2011, 12:43 PM   #8
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You should have a card in you sun visor with the details... and you should order a manual... it is a crime to sell a Taco without the book included, I think!

HERE IS THE CARD:

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Old 01-10-2011, 12:48 PM   #9
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i have heard that you should not engage 4WD at speed while your wheels are sharply turned. i could be wrong, though.
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Old 01-11-2011, 07:43 AM   #10
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is it necessary to drive in 4wd for 10miles per month as the manual suggests?
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Old 01-11-2011, 08:36 AM   #11
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Quote:
Originally Posted by mrdinh View Post
is it necessary to drive in 4wd for 10miles per month as the manual suggests?
1) You need to ask yourself why Toyota says to do it. Obviously it is good for the truck to.

2) Bummer to have 4WD and not go places where you can use it at least once a month.

3) Does everyone drive 10 mi./ mo. in 4WD as a maintenance habit? Probably not... I am sure I may have gone over a month or have driven less than 10 miles a month in 4WD... The truck still shifts fine, but why not try and do what Toyota recommends?
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Old 01-11-2011, 08:47 AM   #12
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Quote:
Originally Posted by JDMcompliant View Post
i have heard that you should not engage 4WD at speed while your wheels are sharply turned. i could be wrong, though.
Hi Joe... when you engage 4WD (H4), the trasfer case 'locks' the front and rear driveshafts together. In a turn, they must rotate at different speeds (the front tires rotate more than the back in a turn). Just like using a clutch when shifting gears, you want the transfer case shifter to pop in and not 'bind' or grind (like if you shift without using the clutch.

On dirt or slippery surfaces (icy pavement, etc.) there is enough slippage to turn in 4WD so there is little to no binding between the front and rear dirveshafts at the transfer case.

Having your tires pointed straight when you engage 4WD will have the least amount of bind between the two driveshafts. If you are in a turn when you shift into 4WD, it probably won't go in until you straighten your tires anyway... so it can 'pop in'.

The difference between 4WD (part time 4WD) and AWD (full time 4WD) is that there is a third or center differential at the transfer case that allows the two drive shafts to rotate at different speeds... so you can drive on dry pavement without any binding what-so-ever.
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Old 01-11-2011, 08:52 AM   #13
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Quote:
Originally Posted by David K View Post
Hi Joe... when you engage 4WD (H4), the trasfer case 'locks' the front and rear driveshafts together. In a turn, they must rotate at different speeds (the front tires rotate more than the back in a turn). Just like using a clutch when shifting gears, you want the transfer case shifter to pop in and not 'bind' or grind (like if you shift without using the clutch.

On dirt or slippery surfaces (icy pavement, etc.) there is enough slippage to turn in 4WD so there is little to no binding between the front and rear dirveshafts at the transfer case.

Having your tires pointed straight when you engage 4WD will have the least amount of bind between the two driveshafts. If you are in a turn when you shift into 4WD, it probably won't go in until you straighten your tires anyway... so it can 'pop in'.

The difference between 4WD (part time 4WD) and AWD (full time 4WD) is that there is a third or center differential at the transfer case that allows the two drive shafts to rotate at different speeds... so you can drive on dry pavement without any binding what-so-ever.
Great info, David. Thanks. Repp'd
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Old 01-11-2011, 09:00 AM   #14
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http://www.howstuffworks.com/four-wheel-drive.htm
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Old 01-11-2011, 09:05 AM   #15
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Quote:
Originally Posted by mrdinh View Post
toyota says go in 4wd at least driving for 10miles per month for proper maint...really?...i live in the city...where do i drive for this?...thought its bad to turn 4wd with dry pavement?
I remember reading in the manual to drive 4wd 10 mi per month to keep every thing lubed up in the transfer case and all that..
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Old 01-11-2011, 09:15 AM   #16
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Binding only occurs in sharp (~ 90 deg) turns. Sweepers and lane changes are fine. So you can get on the highway, engage 4H, drive normally, get off the highway, and go back to 2H. Do it during your daily commute and you don't have to spend extra time on it.
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Old 01-11-2011, 11:31 AM   #17
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i'm asking this 10mi/month on 4wd because was told from people around me that you should use 4wd on office roads, bad conditions only...dry pavement should not be turned on.

i live in the city and most of the time its dry here...only the winter is crazy which have no probs with the 10mi thing...but not the rest of the year
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Old 01-11-2011, 11:34 AM   #18
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Quote:
Originally Posted by mrdinh View Post
i'm asking this 10mi/month on 4wd because was told from people around me that you should use 4wd on office roads, bad conditions only...dry pavement should not be turned on.

i live in the city and most of the time its dry here...only the winter is crazy which have no probs with the 10mi thing...but not the rest of the year
Just try not to turn. Like pop it on the freeway under the 62 MPH maximum and go 10 miles. You can drive with it on and turn it off at any speed but you have to be under 62 to turn it on.
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Old 01-13-2011, 08:14 AM   #19
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christian, can you use the HAC mode ie. with a tacoma manual transmission to prevent rolling backwards in a steep hill for normal driving?

thanks for the vid..that helps!
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Old 01-13-2011, 08:16 AM   #20
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Quote:
Originally Posted by mrdinh View Post
christian, can you use the HAC mode ie. with a tacoma manual transmission to prevent rolling backwards in a steep hill for normal driving?

thanks for the vid..that helps!
HAC only comes in the autos.
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