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-   -   How to 2-hi to 4-hi? 4x4 not working? (http://www.wranglerforum.com/f282/how-to-2-hi-to-4-hi-4x4-not-working-258175.html)

immalex 07-24-2013 10:27 PM

How to 2-hi to 4-hi? 4x4 not working?
 
Hi all,

Just bought my wrangler few days ago, was testing out the four wheel drive system.
The vehicle is a 2002 Sahara with automatic transmission.

This is what I did. At full stop, put the car in neutral, and shifted from 2-hi to 4-hi, then i heard a LOUD grinding noise, and the only way to make it stop is by shutting off the engine. That was pretty scary, thought i broke the vehicle.

What is the correct way to do it? Just want to test out if the 4x4 system is working or not before winter comes.

Thanks all!

Redsand 07-24-2013 10:32 PM

Sounds like you didn't get it all the way into 4wd. (linkage may need adjusted) You can shift on the fly, just pull up on the lever and you will feel when it's in

"When your stupid, your whole body suffers"

immalex 07-24-2013 10:36 PM

Thanks Redsand.
Never driven a 4x4 before, linkage needs to be adjusted? would i need to bring that to a mechanic to get that done?

Also, would shifting from 2-hi to 4-hi while the engine is off, gear in park works? Pretty scared of shifting to 4wd on the fly.

PStov98TJ 07-24-2013 11:01 PM

Don't be scarred to shift on the fly, it was made to do it up to 50mph in case of icy road conditions where 4x4 is needed "on-the-fly." I was a little timid at first too, but it actually shifts better when you're moving a little. Just give it a firm tug. Don't pull it like you're shaking an 80 year old woman's hand a church; give it a good firm man-to-man handshake if that makes sense haha.

And unless you have a body lift, t-case drop, or a tummy tuck, the linkage shouldn't need to be adjusted. And that's something you could and should do yourself anyway. Sounds like you just didn't have it all the way in gear. (Ever driven a standard and let the clutch out without being fully in a gear? Same thing essentially.) I promise, try it when you're idling in some dirt (don't engage when on asphalt, too much traction unless there's ice or lots of mud on top) and firmly tug the shifter from 2hi to 4hi. It should go in pretty nicely.

immalex 07-24-2013 11:51 PM

Just curious, what would happen if i engage in 4wheel drive in asphalt, it would still work fine right? just bad for my tires?

Reason i ask is because the closest beach is half an hour drive away, and just want to test the 4 wheel drive system right away in the am!

freeskier 07-24-2013 11:56 PM

Shifting into 4wd hi works better when moving. Even shifting into 4wd low is smoother if your at a very slow crawl.

There's nothing wrong with testing 4wd on the pavement. Go put it in 4wd and try to make a sharp turn. You'll know if it's in 4wd.

immalex 07-25-2013 12:14 AM

Would i only be able to engage in 4 wheel drive on the fly? or can i engage in 4 wheel while parked? Put in park, without starting the engine, and shifting to 4wd hi?

With the engine running, i put it in neutral, and shifted to 4wd hi, and it made some very scary gear grinding noise. VERY LOUD.

freeskier 07-25-2013 12:29 AM

As long as you are moving it in a straight line just shift on the fly. Also the grinding does sound scary, it is very loud, but really no different than grinding a manual transmission. Both work in similar ways where the actual drive gears are always engaged and moving and it's the dog teeth grinding.

Our transfer cases are chain driven and all the magic happens inside it. If you were to look under the jeep while driving you'd see the front drive shaft spinning. That means the chain in the transfer case is spinning. When you shift into 4wd everything is spinning at the same rate, you're just making the mechanical connection.

PStov98TJ 07-25-2013 12:39 AM

Be very careful driving it on the pavement on 4wd. Don't make several tight turns in a row. You'll most likely be ok but there's a chance you could break something from the binding that will occur due to excessive traction. Just a fair warning. There's no place anywhere near that you could just hop on some grass or something real quick? Like a yard or gravel parking lot?

RevCo666 07-25-2013 01:09 AM

Here's some info straight from the owners manual:

Shifting Procedure
2H to 4H or 4H to 2H
Shifting between 2H and 4H can be made with the
vehicle stopped or in motion. If the vehicle is in motion,
shifts can be made up to 55 mph (88 km/h). With the
vehicle in motion, the transfer case will engage/
disengage faster if you momentarily release the accelerator
pedal after completing the shift. Apply a constant
force when shifting the transfer case lever.

4H to 4L or 4L to 4H
With the vehicle rolling at 2 to 3 mph (3 to 5 km/h), shift
an automatic transmission to N (Neutral) or depress the
clutch pedal on a manual transmission. While the vehicle
is coasting at 2 to 3 mph (3 to 5 km/h), shift the transfer
case lever firmly to the desired position. Do not pause in
transfer case N (Neutral).

NOTE: Pausing in transfer case N (Neutral) in vehicles
equipped with an automatic transmission may require
shutting the engine OFF to avoid gear clash while
completing the shift. If difficulty occurs, shift the automatic
transmission to N (Neutral), hold foot on brake,
and turn the engine OFF. Make shift to desired mode.

NOTE: Shifting into or out of 4L is possible with the
vehicle completely stopped, however, difficulty may occur
due to the mating teeth not being properly aligned.
Several attempts may be required for clutch teeth alignment
and shift completion to occur. The preferred
method is with the vehicle rolling at 2 to 3 mph (3 to 5
km/h). Avoid attempting to engage or disengage 4L with
the vehicle moving faster than 2 to 3 mph (3 to 5 km/h).

immalex 07-25-2013 01:53 AM

Quote:

Originally Posted by PStov98TJ (Post 4000687)
Be very careful driving it on the pavement on 4wd. Don't make several tight turns in a row. You'll most likely be ok but there's a chance you could break something from the binding that will occur due to excessive traction. Just a fair warning. There's no place anywhere near that you could just hop on some grass or something real quick? Like a yard or gravel parking lot?

Just doing a quick test should be fine right? just wanted to test if the 4wheel system is working or not. Driving straight around 20 - 30 mph, and shifting to 4-hi shouldnt do any harm right?

Also, would i have to disengage in 4wd to 2wd on the fly? or can i do that during a complete stop?

RevCo666 07-25-2013 02:07 AM

Quote:

Originally Posted by immalex (Post 4000762)
Just doing a quick test should be fine right? just wanted to test if the 4wheel system is working or not. Driving straight around 20 - 30 mph, and shifting to 4-hi shouldnt do any harm right?

Also, would i have to disengage in 4wd to 2wd on the fly? or can i do that during a complete stop?

If you need to test out 4hi or low, try doing it on grass or a field instead of pavement if you can. Disengagin 4hi to 2wd is fine either at a stop or not. Just don't be doing that at high speeds (read my post above).

PStov98TJ 07-25-2013 07:08 AM

Quote:

Originally Posted by immalex (Post 4000762)

Just doing a quick test should be fine right? just wanted to test if the 4wheel system is working or not. Driving straight around 20 - 30 mph, and shifting to 4-hi shouldnt do any harm right?

Also, would i have to disengage in 4wd to 2wd on the fly? or can i do that during a complete stop?

20-30??? I was thinking more like 5-10. You have to realize that the gear ratios in the front and rear axles aren't exactly the same (usually like 4.11 and 4.10). And any difference in speed between the front and rear axles (like what happens when you turn or make corrections while driving) will cause binding and can implode your t-case. So I'm gonna have to say no to 20-30mph test. But it's your jeep.

And yes you can engage 4hi at a complete stop or while moving. It doesn't matter. Some people just find it easier to shift while moving a little.

freeskier 07-25-2013 10:00 AM

Quote:

Originally Posted by PStov98TJ (Post 4001002)

20-30??? I was thinking more like 5-10. You have to realize that the gear ratios in the front and rear axles aren't exactly the same (usually like 4.11 and 4.10). And any difference in speed between the front and rear axles (like what happens when you turn or make corrections while driving) will cause binding and can implode your t-case. So I'm gonna have to say no to 20-30mph test. But it's your jeep.

And yes you can engage 4hi at a complete stop or while moving. It doesn't matter. Some people just find it easier to shift while moving a little.

The difference between 4.10 and 4.11 doesn't matter, backlash in the gears prevents it from binding.

You guys are being ridiculous. The stresses you place on your drivetrain are far greater than that of driving around on the pavement in 4wd for a bit. It will hurt NOTHING to do a quick test. NO you should not drive around all the time on 4wd on the pavement but you're also not going to implode your transfer case.

Michigunman 07-25-2013 10:30 AM

It's been said a lot but does not seem to be getting through. You can shift from 2hi to 4hi and back while moving or stopped. It will (likely) be MUCH easier while moving at just about any speed. Just ease off the gas so there is not a lot of torque on the drivetrain (as described in the quote from manual above). Now getting in to 4lo and back is a whole different story and some Jeeps seem to behave differently. For me just barely rolling and auto transmission in neutral works best.

As far as driving on pavement it's not going to hurt if you drive straight. But you are not really going to know if it's in 4wd or not, unless you are just counting on the light. While turning and waiting for your drivetrain to bind up probably won't break anything it's still not a good idea. Need to get on some gravel or grass and make sure you can confirm power to the front axle.

PStov98TJ 07-25-2013 02:56 PM

Quote:

Originally Posted by freeskier (Post 4001471)

The difference between 4.10 and 4.11 doesn't matter, backlash in the gears prevents it from binding.

You guys are being ridiculous. The stresses you place on your drivetrain are far greater than that of driving around on the pavement in 4wd for a bit. It will hurt NOTHING to do a quick test. NO you should not drive around all the time on 4wd on the pavement but you're also not going to implode your transfer case.

I realize that the difference in the gears in essentially negligible. But I just wanted to make sure the OP understands that while the jeep will most likely be just fine, there's a chance something could go wrong. And also that I wouldn't just shift into 4wd going down the road at 30mph for no reason. Sorry if I sounded like I was telling him his jeep would implode. Ha just wanted to make sure all the info was out there.


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