Thread: Cdl squeak

The cdl engaged means that there is no slip between front and rear diff. Front and rear diffs are still open, with slip control via traction control. D2a has cdl locking, D2 does not. On wet bitumen the grip is still most probably too high. Squealing sound is most probably not good... I believe that engaging cdl also changes the traction control characteristics.

Thanks bsperka,
My question relates to whether slip between the front and rear with the cdl engaged is a possible malfunction of a faulty/worn cdl. Do they wear? I am trying to decipher the exploded view of the assembly to figure out the mechanical functionality/operation.

I suppose that I could test if there is slip by getting the car crossed up, preferably lift a front wheel, put the handbrake on (locking rear prop shaft) remove TCS fuse and engage cdl, anyone have thoughts on this proposed test method?

As far as I know, the gears are either locked or free; there is no ability to slip. The centre gears in the diff are locked and 50/50 power front / back. I'll double check tonight in Rave.

When you engage the CDL is is 100% locked... that is why they call it a Centre Diff Lock.

You should ONLY use CDL in the appropriate circumstances or you run the potential risk of damaging the transfer case and centre diff through wind-up.

If for ANY reason you need to engage the CDL on hard surfaces (even wet bitumen) you should ONLY drive in a straight line for a short distance and then reverse back... this takes any wind up out of the system.

Unless your tires are "exactly" the same diameter front to rear (which they wont be) you will have wind up even driving in a straight line...

The squeak you heard may well be your Front drive shaft... I would be checking that ASAP..

It took me a while to comprehend the drawings but I think I understand the operation of the diff lock at the power transfer level, when engaged the front prop shaft is locked to the planetary gear housing (diff centre) via a dog clutch. This system should positively lock the front to rear is there any was that the dog clutch could be damaged?
As for the testing that I previously did i was driving <30kph with cdl engaged for < 40 meters, the sound certainly come on as the drivetrain bound up.
I'll get on to checking the front driveshaft, thanks Andy.

I think I got the same sound coming from mine. I just fitted a cdl link kit from davis performace. I'm now haveing trouble.

My low rang activation is now all stiff like its binding up in the tranfer case.

I'm going to remove the link tomorrow. And hopefully get rid of the sound.

So much from lock center this weekend away.

Yeah the cause of the sound is that two of the four bearings in the double cardon are... well not so good. I think it was on the way out, it's common but my test may have been the straw that broke the camels back, I'm sure that it it wouldn't have been too much longer anyway.

Thanks for your help, Cheers

Sorry that's two of the eight