4Low drive without locking diff

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4Low drive without locking diff

Postby geocha » Mon Apr 23, 2018 5:30 pm

Hi everyone.
New owner of a 2010 R51 2.5 diesel.
I have a problem reversing a boat trailer on my sloppy driveway.
I drive a manual and it takes a lot of effort to push the boat up hill.
4L mode makes it a lot easier but the problem is I can not steer the car on hard surface because of the diff lock.
Can the diff lock mechanism be disabled so that I can steer the car while reversing?
Thanks
George
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Re: 4Low drive without locking diff

Postby Smitty » Mon Apr 23, 2018 5:52 pm

Sure someone on here did a switch to unlock the front hubs
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Re: 4Low drive without locking diff

Postby TheRightPath » Thu Apr 26, 2018 8:58 am

My research says not easily. You'd need to install freewheel hubs. AFAIK the front hubs are permanently connected to the driveshafts and only the transfer case gets disconnected when in 2wd. The selector works by turning a shaft that first engages the front drivetrain, then low range.

I also would like to do this, but have worked out if I line the van up first I can get away with minor adjustments with steering and low range works well.

Edit: Oops. Just re-read the OP, does yours have 4wd auto mode as in the R51 ST-L models? My comments are for a D40 without that feature. I'm not sure if the centre diff can be disabled electronically allowing the centre diff to not lock when in 4wd mode. As 4wd auto can be used on road, there may be a viscous coupling or something.
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Re: 4Low drive without locking diff

Postby ImNotLost » Thu Apr 26, 2018 2:35 pm

I believe low range on these is like a sleeve over the whole centre 'diff', so you can't have low range without front and rear tailshafts driven. Free wheeling hubs would do it, but I don't know whether they do them for the R51?
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Re: 4Low drive without locking diff

Postby geocha » Sun Apr 29, 2018 6:29 am

Thanks everyone for reply.
According to the owners manual the vehicle should not be driven on 4Lo mode on hard surface or shale roads.
Only on loose gravel and mud etc.
I am afraid to used it because of this.
I'm thinking i need start looking for a SUV that has the ability to use low gearing without that problem.
George
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Re: 4Low drive without locking diff

Postby Smitty » Tue May 01, 2018 1:49 pm

You will need something with manual front hubs then... Only way you will get that functionality
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Re: 4Low drive without locking diff

Postby Pace » Thu May 03, 2018 11:41 am

geocha wrote:Thanks everyone for reply.
According to the owners manual the vehicle should not be driven on 4Lo mode on hard surface or shale roads.
Only on loose gravel and mud etc.
I am afraid to used it because of this.
I'm thinking i need start looking for a SUV that has the ability to use low gearing without that problem.
George



what if you removed the front drive shaft from the transfer case?
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Re: 4Low drive without locking diff

Postby ImNotLost » Fri May 04, 2018 2:05 pm

Smitty wrote:You will need something with manual front hubs then... Only way you will get that functionality

Or a 100 series 'Cruiser with a slight modification to the wire that controls the auto switching of the centre diff. I haven't done mine at this stage, but I believe it is quite simple.
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