Wife drove in 4L for 20 Miles at 60 miles per hour.

[tbjquig]

That thing had to be redlining!

I do have selec-trac on my Sahara. Dont think that makes a difference on 4L. She may have been in the 50mph neighborhood instead of 60. it was slippery so she may have been a bit slower.

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[timn1984]

Wow I'm glad to know nothing happened in 4L, Who's up for going 60 in 4L in their Jeep???!!!

 

[The Last Cowboy]

I think 62 is the computer limited speed for 4 low. Change the oil and you should be fine. She always drives the minivan from now on!

 

[Goin2drt]

Do you have a 13 speed. How did she get to that MPH in 4lo?

 

[Gorilla57]

Change the oil and you should be fine.

Why change the oil? She may have hit 4K RPM for less than 20 miles. Motor didn’t overheat, and oil is not that fragile.

 

[tbjquig]

I think 62 is the computer limited speed for 4 low. Change the oil and you should be fine. She always drives the minivan from now on!

The one good think is that I told her I needed to trade it in. I went to jeep dealer and drove Gladiator with Diesel but the diesel doesnt come with selec-trac which I really like. I guess diesel has too much torque for selec-trac.

 

[oldcjguy]

You're probably fine. There was definitely some strain on the axles and transfer case if she was driving on dry pavement. Probably why it took you 20 min to get it out of 4Lo. Next time (if there is a next time) jack up one wheel so it comes off the ground. It will unload the drivetrain.

As for problems with the engine. No, a Sahara's low gear isn't that extreme and 8th in the 8 speed is the second over drive gear. Someone else calculated the RPMs above and they aren't that bad at all. The engine probably never even got that hot. With all the gear reduction the engine wasn't even under a heavy load. It was just RPMs and 4000 rpms isn't that much. We are just spoiled these days with all of the overdrive options out there. 20 minutes isn't that long.

When I was younger (old guy story coming), when we built hot rods between 3000 and 3500 RPMs at 60 was totally acceptable as a daily driven street car.

 

[4xFUN]

My wife drove my my JL Sahara 2.0T for 20 miles in 4 LOW at 60 mph. I cant find any issues? Do you think there could be permanent damage? Thanks.

Now you could use that as an excuse to order a 392...

 

[oldcjguy]

I do have selec-trac on my Sahara. Dont think that makes a difference on 4L. She may have been in the 50mph neighborhood instead of 60. it was slippery so she may have been a bit slower.

If it was slippery then everything is totally fine. The only thing I would have been worried about would have been the driveline binding up. If she hit slippery patches it relieved the stress.

 

[20-Willys]

This same thing happened to my old Explorer. There was a thought that 4LO was meant for a small amount of snow.

 

[Gregj]

20 miles at near Redline, I'm sure it's broke in good now!

If it's now making any weird noises now it should be OK. I recommend and oil change after that break-in run.
Gregj

 

[Black Jeep Convertible]

Is this how people do desert runs? Flying in 4lo?

 

[kaffeian]

From the owners manual...

Four-Wheel Drive Low Range — This range provides low
speed four-wheel drive. It maximizes torque to the front
driveshaft, forcing the front and rear wheels to rotate at the
same speed. This range provides additional traction and
maximum pulling power for loose, slippery road surfaces
only. Do not exceed 25 mph (40 km/h).

 

[Zandcwhite]

4,000 rpms for 20 minutes didn’t do any damage to the engine or trans. The transfer case gear oil may have gotten a little hot. If you’re worried drain And refill the transfer case, but I’m sure it’s fine.

 

[Deleted member 59098]

It is a Fiat product. An Italian tune up may not hurt.

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