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Thread: 4H to 4L issue

  1. #1
    Fresh Catch KRob's Avatar
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    4H to 4L issue

    Hello,

    New to this forum so if this issue has been posted already, could someone please send me to the right thread? Anyways, I just bought my very first Jeep ever 2 weeks ago which was a 2019 Unlimited Rubicon(automatic). I took her off pavement for the first time yesterday to explore Rowher flats, which is just east and a bit north of Santa Clarita, CA. I was having no issues with going into and out of 4H from 2H, although I did have to pull the shifter harder than I thought I would. The issue was going in and out of 4L. Most times when I did, the transfer gears grinded before going into 4L or going back into 4H from 4L. I felt like I was doing everything correct - was in 4H, shifted the transmission into neutral, was moving about 2-4mph and pulled the transfer lever firmly down into 4L(or back into 4H) - but the grinding happened more than once. The couple of times it didn't happen was when I was on a slight down slope and I just put her in neutral and after I just started to roll, it shifted effortlessly into 4L. I read that this was common problem(hard transfer) and that it would loosen up the more I use it. My concern is that I'm gonna mess up the transfer case. Is this a common problem with the new JL's?

    Thank you!

  2. #2
    Living the WAYALIFE Ddays's Avatar
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    Quote Originally Posted by KRob View Post
    Hello,

    New to this forum so if this issue has been posted already, could someone please send me to the right thread? Anyways, I just bought my very first Jeep ever 2 weeks ago which was a 2019 Unlimited Rubicon(automatic). I took her off pavement for the first time yesterday to explore Rowher flats, which is just east and a bit north of Santa Clarita, CA. I was having no issues with going into and out of 4H from 2H, although I did have to pull the shifter harder than I thought I would. The issue was going in and out of 4L. Most times when I did, the transfer gears grinded before going into 4L or going back into 4H from 4L. I felt like I was doing everything correct - was in 4H, shifted the transmission into neutral, was moving about 2-4mph and pulled the transfer lever firmly down into 4L(or back into 4H) - but the grinding happened more than once. The couple of times it didn't happen was when I was on a slight down slope and I just put her in neutral and after I just started to roll, it shifted effortlessly into 4L. I read that this was common problem(hard transfer) and that it would loosen up the more I use it. My concern is that I'm gonna mess up the transfer case. Is this a common problem with the new JL's?

    Thank you!

    Yes, this is completely normal, especially the shift from 4H to 4L. The more you use it the more it'll loosen up as everything gets broken in.
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  3. #3
    Old Timer jdofmemi's Avatar
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    Yep, that's normal. With practice you will get a better feel for it as well.

    Coasting in neutral, just barely moving, and make a quick firm movement on the shifter.
    It will always gnash a little bit, but it won't hurt anything, as long as you don't just keep grinding away without getting it in.

  4. #4
    Fresh Catch KRob's Avatar
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    Thanks for the replies. It does comfort me when people tell me it’s normal. But it still is unnerving every time it makes that sound. I mean I’ve heard that noise before and was pretty sure what it was but it’s different when it’s was someone else’s rig lol!
    2019 Unlimited Rubicon
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  5. #5
    Addict jeeeep's Avatar
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    Quote Originally Posted by KRob View Post
    Hello,

    New to this forum so if this issue has been posted already, could someone please send me to the right thread? Anyways, I just bought my very first Jeep ever 2 weeks ago which was a 2019 Unlimited Rubicon(automatic). I took her off pavement for the first time yesterday to explore Rowher flats, which is just east and a bit north of Santa Clarita, CA. I was having no issues with going into and out of 4H from 2H, although I did have to pull the shifter harder than I thought I would. The issue was going in and out of 4L. Most times when I did, the transfer gears grinded before going into 4L or going back into 4H from 4L. I felt like I was doing everything correct - was in 4H, shifted the transmission into neutral, was moving about 2-4mph and pulled the transfer lever firmly down into 4L(or back into 4H) - but the grinding happened more than once. The couple of times it didn't happen was when I was on a slight down slope and I just put her in neutral and after I just started to roll, it shifted effortlessly into 4L. I read that this was common problem(hard transfer) and that it would loosen up the more I use it. My concern is that I'm gonna mess up the transfer case. Is this a common problem with the new JL's?

    Thank you!
    When in neutral, I come to almost a complete stop then shift into 4L, once you get the rhythm it shifts like you described on a slight down slope.

  6. #6
    Knows a Thing or Two Primo82's Avatar
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    Good info! I followed jeeps guidelines a few times and was a little freaked out by the chattering gears... So i started only switching while stopped. If it doesn't drop right into or out of 4L then drive or reverse a few inches and try again. But from this feedback I'll probably bang the gears (in line with jeeps 2-4mph recommendation).

  7. #7
    Hooked WiscoHR's Avatar
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    Add just to add the clunk when you hit the throttle in 4L is normal too.

    But yes you get used to the shifting with time.


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  8. #8
    Knows a Thing or Two Bierpower's Avatar
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    Just wanted to add to this, I don't have a JL. Most wheel speed sensors don't have a fast enough pulse to register until around 3-4mph so if your speedometer is up off of 0 your probably going to fast. I find the sweet spot is when the speedo needle drops to nothing but you are still rolling. I did shift from low to high once this past weekend while the speedo was registering and it made a horrendous noise. Just my findings in trial and error.

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