Thread: RWD, or FWD in a RRS/D3

Could you use rock crawl to engage the CDL and then pull a fuse to stop it disengaging?

I thought Rock Crawl was low range only so awfully slow on the road.

Originally Posted by garrycol

I thought Rock Crawl was low range only so awfully slow on the road.

Hey Garry, how fast do you want to go with a busted CV or diff?

Unplugging the transfer box ecu after selecting rock/crawl may do the trick if the diff is indeed locked whilst not moving. The ignition would probably have to be on at the time so probably better to be able to just unplug or switch off one of the stepper motor wires. High/low range seems to be achieved by powering a solenoid in the appropriate direction (swapping power & ground) so ostensibly high range could be powered manually with the transfer box ecu unplugged.

I'm thinking getting to the road is good, speed on the road will be determined by the tow truck driver !

We discussed this 4 or 5 years ago - I had asked some of the LR techs if it was possible to fabricate an electronic switch to lock the diff if something like this occurred. The considered opinion was that the diff is not designed to be permanently locked, so would result in damage to the motor.

The CDL does not automatically engage when you select R/C - it will lock when the vehicle is moving and the TR system senses that it needs to be locked.

Cheers,

Gordon

The wiring diagram shows 2 Hall effect sensors for the motor which I suspect are used to signal when the motor reaches its permissible limits. I might have to tap into the sensor wires to watch what's happening as rock/crawl is used so that a box can be developed that can't do damage. If such a box could be produced, a connector could be permanently fitted to the wiring to the motor and the box only plugged-in once the transfer case ecu connector is unplugged.

Slightly off topic but still on the subject of modifying Traction Control. Has any electronics guru thought of, or produced a multi-position switch for D2 T.C. that would adjust the amount of slip which is what I understand the D3 T.C. does? I.e. allow more slip in Sand mode and less in Rock mode, I know it also does alot of other clever stuff like moving brake pads closer to disc to stop slip quickly in Rock mode to prevent drive line damage, etc.

Thanks for the input - but I am no closer in understanding how I would make a RRS/D3 move if the front diff no longer provided drive to the front wheels.

Graeme I appreciate your technical response and respect your knowledge but you techo response is a bit more than most of would be able to do if stuck somewhere.

Gordon, clearly you have looked at this before and have the experience offroad and in training. In your opinion would the systems detect the lack of drive to the front and start auto locking the cdl or am I stuck doing what Graeme has suggested OR do I get a 4wd tilt tray to come and get me.

Indeed can I do what I would do in previous generation discos or even my 101 just take the front drive shaft out - as I cannot manually lock the cdl would the system detect the spinning front output shaft on the transfer case and start locking the CDL and providing drive to the rear?

Cheers

Garry