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Old 28 March 2017, 09:12   #1
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2wd Low??

I posted some time ago regarding the issue I have driving from the slip I use up to the main road.
It's an immediate 25% incline from a standing start. My 2015 D max gets up but the clutch takes a hammering. Following advice from here I now go up in 4wd low but as it's a tarmac road, by the time I'm at the top of the hill all sorts of lights and alarms are sounding.
I spin the wheels out on a patch of grass at the top of the hill and go back to 2wd for the remainder of the journey but I can't help thinking I'm putting a lot of stress on the diff.
I've read some Hilux owners put an inline switch to the electric motor that engages the 4wd thus enabling 2wd low.
With hindsight I should have bought the auto as this may have been better in this situation but the cost to change would be considerable.
Have any of you come across a 2wd low mod on a dmax or any ideas how easy this would be to do?
Cheers Colin
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Old 28 March 2017, 10:23   #2
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There's something seriously wrong if a 15 plate 4wd truck with low box is getting wound up on a job like that, it's what it's for ffs! Are you sure you haven't got diff lock on? Has it got free wheel hubs that need engaging?
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Old 28 March 2017, 10:43   #3
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If you were going round in tight circles then understandable but if it's reasonable straight it shouldn't be a problem as Dave says it
Are the tyres worn the same, as in fronts almost done and rears brand new or vice versa? That might cause a problem
What are the switching options for 4wd? Most 4x4s can't select low without 4wd which is a shame but you may be able to block out the diff locks if it has them
The thinking that an auto will have an easier time isn't always true they still have clutches that wear and oil can overheat and the repair bills are WAY bigger if they do go wrong
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Old 28 March 2017, 11:07   #4
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How heavy is the boat you are dragging up the slip ? What are the lights and alarms that come up ?
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Old 28 March 2017, 12:05   #5
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I haven't mentioned the two 90 degree bends to negotiate before getting to the top. IMO Modern pick ups still have antiquated and limited 4wd systems (I think only the L200 has an on road 4wd setting). I don't think it has a centre diff? So essentially it's locked when you go in to 4wd. no freewheeling hubs.
If possible,I'm after a way to go in to low ratio and stay in 2wd. Both are operated by small electric motors rather than a 2nd gear lever so it should be possible.
Tyres all worn to same level all terrains with 20,000mls on and swapped front to rear on 10,000mls.
The alarms are telling me I shouldn't be in 4low on tarmac. Steering gets heavy and wheels scrubbing on tarmac on 2nd bend.
All is fine after I take it on grass once on the flat, it spins out then I drive on in 2wd with no problem.
Just thinking this can't be doing it any good?
Never weighed boat but it's a 6.3m Humber OP with DF140 on the back - plus camping gear - plus whatever fuel I've not used say 40litres. Plus pick up back full of luggage etc etc
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Old 28 March 2017, 12:23   #6
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Think you're worrying unnecessarily. Not unusual for tyre scrub or crabbing sensation on hard lock. Been driving Audi quattros for years and it's a characteristic of the car.

You're choosing 4wd so the load is spread to all 4 wheels. Don't ride the clutch and keep it slow and steady. If your particularly worried, then drop the rear diff gear oil at the next service and replace. Normally I'd only do this at 100k intervals.
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Old 28 March 2017, 16:42   #7
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It's not just pickups most 4x4s lock the centre diff when you engage 4wd low my merc ml which is full time 4wd will wind up when in low same with my hilux .It's the corners that are giving the car a hard time is there no opportunity to release the 4wd before the corners or is it really steep all the way?
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Old 29 March 2017, 02:09   #8
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The bend itself is a little flatter. But when the truck is on the flat bit the trailer is still on the steep and vice versa once I've gone beyond. Wouldn't I need to spin the wheels of the truck or reverse it to release any wind? I do this at the top as it won't go back in to 2wd unless I spin the back wheels on the grass.
When I was last in Isuzu for a service they had a big banner outside saying "class leading 3.5ton towing capacity". I told the staff it should have small print saying "but not up a steep hill from a standing start"!
When I explained my situation they either didn't believe me, thought I was doing something wrong, or didn't have a clue what diff wind was. I know a few lads who tow diggers and farm equipment with various pick ups and they all say they'd benefit from 2wd low
Just wondered if any of you tinkered with trucks and knew of a way of achieving it?
My other alternative is to pay the tractor £20 to take the trailer to the top. I stubbornly refuse to do it on a matter of principle. Preferring to carry on as I am and hope that I'd be covered under warranty if anything breaks. Maybe I should just swallow my pride!?
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Old 29 March 2017, 05:47   #9
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Yes 2wd low should be an option but since they did away with selectable freewheeling hubs it's not available
Best thing I ever had was an old daihatsu fourtrack which had manual hubs it was ideal when reversing or shunting a trailer as you could drop into low and not have the wheels trying to hop skip and jump round corners
Have you looked underneath to see if it has electric diff locks? You may be able to try pulling the multi plug off and see if it helps and if that works then wire in a switch
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Old 29 March 2017, 07:50   #10
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Seen this with pick-ups before, mate used to park his speedboat on a lawn and had a tight turn out onto the road, had to use low and his truck then automatically went into 4 wheel drive, it really didn't like the turn and in only a matter of meters it would wind the transmission up. I fix 4x4’s for a living, any situation where the transmission is stressed, wheels scrubbing and jumping is not good for them - it will induce premature failure in the drive train.
Most landys have open centre diffs, using hi and low on the road fine – no wind up whatever you do and if you need extra traction just lock the centre diff - landrovers run quite a good 4x4 system
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