4x4 low banging
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Fleet Mechanic
Joined: Mar 2014
Posts: 1,272
Likes: 130
From: Missouri
4x4 low banging
When I use 4x4 low and switch gears they will bang very hard. Going into park grinds the gears. Is this normal or should I be concerned?
I've used 4x4 low on other vehicles but this is the first time with a 3/4 ton.
I've used 4x4 low on other vehicles but this is the first time with a 3/4 ton.
Fleet Mechanic
Joined: Jul 2005
Posts: 1,800
Likes: 52
From: Southern Colorado
Some 4WD vehicles with automatics will clunk or bang going into 4 low, due to transmission parts still spinning when the trans. is in neutral. If you're getting evil sounds just during gear changes, then something else is likely wrong. Change the fluid and see what's stuck to the magnet (if there is one) or comes out of the transfer case in the fluid. You're looking for larger metal shavings, rather than dust.
Cargo Master
Joined: Dec 2015
Posts: 2,920
Likes: 515
Yeah, I've gotten the grinding going into Park. I think it's just the gear reduction is able to keep things spinning in that brief period between R and P, combined possibly with a not-quite-strong-enough spring on the park pawl.
Er, that's my theory at least.....
Er, that's my theory at least.....
Cargo Master
Joined: Dec 2015
Posts: 2,920
Likes: 515
And any shift in low range is gonna be harsh.
I pretty much exclusively use manual selections in low range. Trying to have an "automatic" in low is ridiculous and defeats the purpose as it'll try to run to OD as quickly as possible. Some of this is also just my rock crawling background but seriously "D" and low range don't mix.
And when you shift manually treat it like a bicycle: let up on the throttle, select the next gear, then get back into it once it's shifted. IOW YOU are the clutch
I pretty much exclusively use manual selections in low range. Trying to have an "automatic" in low is ridiculous and defeats the purpose as it'll try to run to OD as quickly as possible. Some of this is also just my rock crawling background but seriously "D" and low range don't mix.
And when you shift manually treat it like a bicycle: let up on the throttle, select the next gear, then get back into it once it's shifted. IOW YOU are the clutch
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Fleet Mechanic
Joined: Mar 2014
Posts: 1,272
Likes: 130
From: Missouri
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Cargo Master
Joined: Dec 2015
Posts: 2,920
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It's super sweet with the 6R140 in M and just bump the +/- button on the shifter 
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And any shift in low range is gonna be harsh.
I pretty much exclusively use manual selections in low range. Trying to have an "automatic" in low is ridiculous and defeats the purpose as it'll try to run to OD as quickly as possible. Some of this is also just my rock crawling background but seriously "D" and low range don't mix.
And when you shift manually treat it like a bicycle: let up on the throttle, select the next gear, then get back into it once it's shifted. IOW YOU are the clutch
I pretty much exclusively use manual selections in low range. Trying to have an "automatic" in low is ridiculous and defeats the purpose as it'll try to run to OD as quickly as possible. Some of this is also just my rock crawling background but seriously "D" and low range don't mix.
And when you shift manually treat it like a bicycle: let up on the throttle, select the next gear, then get back into it once it's shifted. IOW YOU are the clutch
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