Sounds good - we need pictures
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They are, of course, permanent four wheel drive and have a centre differential in the Transfer Box.
You have a Transfer lever to the left of the gearstick (is yours manual or Automatic ??), the operation is the same, though the linkage is slightly different underneath the skin.
The Transfer Lever should be on the left of the gate and pulled back as far as it will go - this is 'H' and is High Ratio with the centre diff open. Its for normal driving.
Keeping the Transfer Lever to the left, push it forward as far as it will go. This is 'HL' and is High Ratio with the Centre Diff locked. You can shift at road speed up to about 60 but you may need to back off the throttle a touch to get it to engage.
When engaged you will get an Amber light on the dash showing the axle configuration with an 'X' in the centre of the propshafts.
Don't run on dry roads in this mode or you will get "Transmission Wind-Up", the motor will start to labour, the tyres might squeal or something in the transmission will break - usually the Central Differential Planet Gear Carrier - you have been warned
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At crawling speed (under 5MPH) or when stationary, move the Transfer Lever from 'HL' across to the right and then forward. This is 'N' and the Transfer Box is in Neutral. Some use this as a secondary anti-theft device
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From 'N' move the lever forward again and it will engage Low Ratio. This is 'LL' Low Ratio with the centre Differential locked. you cannot run the 90 or 120-Series in low with the centre diff open as you can on some of the 100-Series.
Whilst in Low Ratio you will (should) be able to engage the Rear Differential Lock. This is done via the rotary switch by your left knee. It only works in 'Low'.
When engaged you will get a red light on the dash showing the axel configuration with an 'X' in the centre of the rear axel.
If the light is flashing the locker hasn't engaged. You might need to drive the truck forward and back while turning the steering wheel to get it to engage. Once engaged the red light will be steady.
I hate to say it, but with a 2001 car you will probably have to buy a new locker - particularly if it spent its life north of Watford - they dissolve in road salt
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Be careful of playing on tarmac in Low Ratio with the rear diff locked - you could chew up the surface
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Hope this helps; if you have any more questions just ask
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Bob.