DIFF LOCK v ATC????

[Range Rover Ron]

Hello all,

I've got a 1994 RRC which has no diff lock, it has the automatic traction control system.
There is a pump on the brake system that allows the brakes to be operated when detectors see one wheel spining faster than the others, (at least that's how I think it works!)

My gearbox has a little argument with me when I shift from 1st to 2nd gear,
it also slips out of low 2nd gear when off road so I'm thinking of replacing it.

What I'm wondering is what would happen if I fitted a standard RRC/Disco gearbox that has a difflock on it?
When in the sticky stuff with both diff lock and ATC would I create an awesome off roader?
Would the two systems counter-act each other?
Has anyone done this?
Any side affects found or anticipated?

The later, non diff lock gear box is probably hard to come across so this might be the easiest way around my problem,
any ideas any fellow M-C'ers?

[Hightower]

I have a 1998 Disco Td5 which initially only had TC fitted as standard.  Whilst it was good, it did still lack in certain situations.  As a result I retrofitted a CDL and tweaked the ECU's so that both would work together (unless I decide for them not to).

The upshot is that with both working it takes alot more to get the car stuck than it did before (although I can still do it with comsumate ease).

Obviously this applies to the Disco 2, but I can't see your situation being that different.  Go for it I'd say!!

[Skibum346]

I think what your talking about is the borg warner transfer box that has a viscous coupling fitted instead of a manual centre difflock.  When one wheel spins too fast, the liquid in the viscous coupling seizes up forcing drive to split to both axles.

Some models also have a version of traction control using the ABS components.

If your jumping out of gears, I'd suggest that's your gearbox at fault rather than transfer box or TC...?

Skibum

[Range Rover Blues]

Ron, he's right.  The '94 model was available with ABS, if this is fitted you could add ATC which only works on the back, if one wheel is spinning it will lock it up briefly.  The system will not run indefinietly as the brakes overheat.  It's no substitute for a locking diff.

Tiy centre diff is the viscous Borg-Warner unit, so it's already fully automatic.  Whilst there is some mileage in fitting a Disco style LT230 in there for pure off-roading it is not as good a unit on the road.

[Skibum346]

Ron, he's right.

  :dance: 8)

I like the sound of that...   :dance:

[Range Rover Ron]

Hello Guys,
all points taken onboard and thanks for replying.

I do understand that it is the gearbox that is causing the jumping out of second and the notchy transfere from first to second,
my plan is to change the gearbox.
I just wanted ask around regarding the fitting of a standard, diff lock gearbox to my RRC al la Disco or RRC, which should be easy to get hold of.
An exact replacement for my original gearbox may be a bit like searching for hen's teeth with the ATC system.

I was wondering how it would work either with or against my ATC system.
There is definately and ATC system as there is a pump to the brake system which will give the brakes pressure even if i don't touch the brake pedal.

One of the things I was thinking that would be a plus is that it could never get cross-axled with diff lock & ATC.
But would the diff locked axle fight against the ATC braking system and heat up the brake pads as mentioned above?
Hmmm..........more pondering me thinks!

cheers lads,
Ron.

[Range Rover Blues]

If you've got ATC then you must have ABS, but neither have anything to do with the gearbox.

The Borg-Warner is fully interchangeable with the LT230 and the LT77 with the R380 AFAIK.

Blue has the B-W now but was built with LT230, the props are the same length, the handbrake the same, just the control linkage is simplified. The current box came from an Auto, but Blue is manual, for now.

The 1st to 2nd problem is very common and could be fixed by replacing the synchro hub that controls both, but is the gearbox worth the cost of the part without a full recon :?

Either way all you should need is another gearbox

[BAZZ]

 
Ron , with the box jumping out of gear it sounds like the 2nd gear synchro is faulty. This can be repaired. Had mine done at 120000 and its now at 254000 and alls well. Same engine, box and axles. Bazz.  :D