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  #1  
Old 12-04-2013, 10:10 PM
John Cambell John Cambell is offline
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Default What is safe speed to change to 4 wheel drive?

What is the safe speed to switch to 4 wheel drive auto?

What is the safe speed to switch to 4 wheel drive high?
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Old 12-04-2013, 10:27 PM
Talon66 Talon66 is offline
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The answer is in your owners Manual
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Old 12-04-2013, 10:43 PM
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Originally Posted by John Cambell View Post
What is the safe speed to switch to 4 wheel drive auto?
The users manual does not stipulate any speed restriction for going from 2DW to 4WD Auto, it does indicate that releasing the accelerator while turning the knob to 4WD Auto will help speed up the transition from one to the other.


Quote:
What is the safe speed to switch to 4 wheel drive high?
The manual does not stipulate any speed restriction for going from 2DW to 4WD High, it does indicate that releasing the accelerator while turning the knob to 4WD High will help speed up the transition from one to the other.

The only restriction for this transition is if your truck has a Manually Shifted Transfer Case, if it is, then the max Speed to perform this transition is 55mph, but I have not seen any manual trucks myself.

My rule of thumb is best to keep it under 55mph for any transfer case transitions to Auto or High, but that's just me

Low is a different ball game.
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Old 12-04-2013, 10:56 PM
CharlieL CharlieL is offline
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I'll assume you have the 8-speed with the five-position transfer case switch. I found on page 402 of the owners manual the statement "Shifts between 2WD and 4WD Auto and 4WD Lock can be done with the vehicle stopped or in motion. With the vehicle in motion, the transfer case will engage/disengage faster if you momentarily release the accelerator pedal after turning the control switch." Regardless of how much I searched, I couldn't find anything about a certain speed - other than shifting to 4WD Low. For shifting to 4WD Low, the owners manual (page 403) says "slow the vehicle to 2 to 3 mph).

I've shifted to 4WD auto at about 35-40, but I've never shifted to 4WD Lock with my truck moving. Call it cautious, but I don't think I'd shift into 4WD Lock moving very fast - imho not over 10 mph. When I've needed 4WD Lock, I shifted before moving out of park.
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Old 12-05-2013, 10:24 PM
John Cambell John Cambell is offline
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Thanks for all the help

I think its safe to say, the vehicle should be stopped if shifting to 4 high or 4 low.

Auto, probably around 50km? or were you talking miles.
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Old 12-06-2013, 01:25 PM
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John you don't need to be at a complete stop for 4x4 Lock to be engaged. That being said, personally...make sure your not spinning when your trying to engage the 4x4 Lock and keep the speed to under 70km/h when engaging it.

As Asur said....4x4 low is a different ballgame all together. Come to a complete stop to engage it if you can.
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Old 12-06-2013, 02:22 PM
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It's actually better to be moving to engage 4wd from what I understand. 4HI in our jeep is very difficult to get into if completely stopped. If rolling it's easy. The manual says 55mph or under (but it's a manually shifted transfer case, as Asur said).

The manual says for 4LO to be rolling less than 5mph, then put the transmission in neutral, then shift to 4LO while still rolling. Gotta be quick! lol
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Old 12-06-2013, 07:20 PM
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4wd high can be done at any speed, it makes no difference to the truck.
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Old 12-06-2013, 07:35 PM
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Originally Posted by Red-Stripe View Post
4wd high can be done at any speed, it makes no difference to the truck.
That may be true but I'm having a hard time thinking of a credible reason to pop it into 4WD-Hi at speeds above about 55MPH....
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Old 12-06-2013, 07:43 PM
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Originally Posted by Grubrunner View Post
That may be true but I'm having a hard time thinking of a credible reason to pop it into 4WD-Hi at speeds above about 55MPH....

Lmao .......
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