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Old 12-29-2007, 06:15 PM   #1 (permalink)
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Default Put 4WD back to 2H but still sounds like 4WD?

Hello People,

Searched the forum, but just cant find a post similar to my problem.

Came back from the snow today and had the truck in 4L and 4H during the snowy portion of the ascent and descent. When I put the XL7 back into 2H, the truck sounds like it is "stuck" in 4wd?

What I mean by that is that the transmission or something else winds up real fast and sounds like the RPM are really high. My tach RPM's are fine, but something sounds like it is revving real high. Once I hit about 30- 40 MPH, it got real loud and when you take your foot off the gas, it slows down real quick.

Any thoughts? Thanks in advance,

Scot

*******EDIT*********

Okay, let car cool down and ran transmission back and forth through P, R, N, D, 2, L. Started it up and all is fine. What the heck?

Last edited by Veritas; 12-29-2007 at 07:41 PM.
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Old 01-02-2008, 07:49 PM   #2 (permalink)
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Quick easy way to test if stuck in 4x4 mode is lift the front end of car and try and rotate a front wheel, if cant its stuck. If can easily rotate it not in 4x4 mode.

You prob can disgage the 4x4 mode by disconecting the airhose to the pump located behind the front bumper. It could be possible that the air release port on the pump is blocked..

By the sounds of it, its stuck in 4L.
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Old 01-02-2008, 08:03 PM   #3 (permalink)
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yea somehow it was stuck in low. Like I always preach.. EXERCISE THE 4wd!!! all year long! Ill bet last time it was in 4wd was a year ago.. You also have to be sure you put in in and out of 4wd with the wheels pointed straight. If thery are turned it will not come out of 4wd
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Old 01-03-2008, 01:58 AM   #4 (permalink)
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Thanks for the replies, gents.

I do cycle the 4wd all the time. In summer, I use it a lot on back fire roads. And in the winter, I have used it in the snow.

Well, I tried it again and it still stayed in 4L.

julesvreug, so you are recommending to check a pump?
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Old 01-03-2008, 02:11 AM   #5 (permalink)
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yep, check the pump, norm when selecting 4h or 4l it will pump air into the transfer case and difs to lock them into the selected modes. When going back into 2 wheel drive it should release air, if it doesnt the diffs and transfer case will still be locked.

To release it you should see the acutator pump behind front bumper next to the horn. There will be a hose attached to it, if you disconect it, it should release the air presure.

If this manages to fix it, i would get the pump checked. If it doesnt, it most likely be a prob with the transfer case. Nothing serious, as its happend to me before, mine was just low fluids, and also at one time mud was covering the pump so cleaned it.

Good luck!

I would upload the manual for the dif and transfer case but its 6.5meg
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Old 01-03-2008, 01:40 PM   #6 (permalink)
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Wow, great info. That is a huge help. Thank you very much. Any way I could swindle you to e-mail me the manual you mentioned?
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Old 01-04-2008, 08:05 AM   #7 (permalink)
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Cool,

i can defenatly email it. Have several parts to the manual, electrical, Motor and transmision..
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Old 01-04-2008, 02:50 PM   #8 (permalink)
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Also...when was the last time you changed your gear oils? Old oil will thicken up, loose some of it's lubricity ESPECIALLY when cold, and keep those diff and x-fer case parts / levers / clutches from actuating freely.
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