Pb challenger rear diff lock issues?

[coughy]

um oj that is incorrect look here

https://www.harrop.com.au/shop/4x4-performance/driveline/elocker?make=56

our challengers have a 28 spline 9" crown wheel harop make them

and the front is a 8" crown so yes you can get harrop elockers

[cookie9]

thanks OJ.. thought the ARB ones would be fine.. bugger!

oh well guess I'll talk to the dealer see if they have any clue about what could be at fault. As usual they will probably say "mate, first time we have ever seen a problem with the lockers in Australia!" haha

[NJV6]

Like this, it says LSD factory diff lock but Australian PB/PC Challengers only came with RDL and not LSD.

https://www.ebay.com.au/itm/MITSUBISHI-CHALLENGER-REAR-DIFFERENTIAL-CENTRE-LSD-KH-PB-PC-12-09-09-10-11/202114899063?hash=item2f0efc9c77:g:PSkAAOSw9hdaDEii

OJ.

If the challenger rear diffs are the same as Pajero gen 2 which I suspect they would be then they do have LSD plates in the locking diff. The 9 inch ones have more plates than the 9,5 ones, but not as many as the non locking LSD.

[old Jack]

um oj that is incorrect look here

https://www.harrop.com.au/shop/4x4-performance/driveline/elocker?make=56

our challengers have a 28 spline 9" crown wheel harop make them

and the front is a 8" crown so yes you can get harrop elockers

Sorry guys I was going off my files which are outdated, Harrop do do a 9" 28 spline E- Locker so it is an option t $1700 + fitting.

OJ.

[old Jack]

If the challenger rear diffs are the same as Pajero gen 2 which I suspect they would be then they do have LSD plates in the locking diff. The 9 inch ones have more plates than the 9,5 ones, but not as many as the non locking LSD.

I am confussed, I have never seen a locking LSD that can be manually locked like a coventional diff lock.

OJ.

[whereswes]

I am confussed, I have never seen a locking LSD that can be manually locked like a coventional diff lock.

OJ.

x2 but I'd love one. LSD for the beach and diff lock for the high country

Maybe they exist but I've never seen a differential lock with a built in LSD clutch pack.

I'm thinking the one on Ebay must be open, have a diff lock or (not that I know of one) an aftermarket LSD. The PA gen 2 was the only Oz Challenger I'm aware of that came with an OEM LSD.

Cheers
Wes

[cookie9]

Had a chat to couple of mechanics and a diff specialist. None had any experience with challenger rear locker.

Are there any test that can check the pump and release valves etc before diving into inner workings of the diff?

[old Jack]

Had a chat to couple of mechanics and a diff specialist. None had any experience with challenger rear locker.

Are there any test that can check the pump and release valves etc before diving into inner workings of the diff?

Looking at the Service Manual I think this is how it works. RDL actuation is via diaphragm that expands when low pressure air from the air pump is applied and requires continual air pressure to stay engaged. There is a release valve built within the air pump that dumps the air press when the RDL is selected off and the diaphragm contracts. There is a RDL detection switch that sends a signal to the ECU to say the RDL is either mechanically engaged or disengaged.

You could try teeing an air pressure gauge in the line between the air pump and RDL to see if the release valve is dumping the air or not. I am assuming the RDL engaged light on the dashboard remained illuminated despite the RDL switch being selected "OFF"?

OJ.

[Toddyh]

My difflock once came on cruising down the M2 at 100km/h. Got home OK. Turns out the breather was blocked with mud. Cleared the mud and actually installed extended breather and haven't had the issue since.
I know the cells area and there is a bit of mud about at times so it would not surprise me if the same had happened to you.

[old Jack]

My difflock once came on cruising down the M2 at 100km/h. Got home OK. Turns out the breather was blocked with mud. Cleared the mud and actually installed extended breather and haven't had the issue since.
I know the cells area and there is a bit of mud about at times so it would not surprise me if the same had happened to you.

Hi Todd,

Did the RDL engage by itself or did it not disengage, reason for the question is there is a speed switch in the system that prevents RDL selection above 12kph and engagement over 6kph. Did the diff actually lock or did you just get the dash RDL "ON" light illuminate?

OJ.

[Toddyh]

Hi Todd,

Did the RDL engage by itself or did it not disengage, reason for the question is there is a speed switch in the system that prevents RDL selection above 12kph and engagement over 6kph. Did the diff actually lock or did you just get the dash RDL "ON" light illuminate?

OJ.

Light came on and I assumed so did the diff lock. I pulled over and popped off the breathers before hitting any corners and that seemed to sort it out.

[cookie9]

Looking at the Service Manual I think this is how it works. RDL actuation is via diaphragm that expands when low pressure air from the air pump is applied and requires continual air pressure to stay engaged. There is a release valve built within the air pump that dumps the air press when the RDL is selected off and the diaphragm contracts. There is a RDL detection switch that sends a signal to the ECU to say the RDL is either mechanically engaged or disengaged.

You could try teeing an air pressure gauge in the line between the air pump and RDL to see if the release valve is dumping the air or not. I am assuming the RDL engaged light on the dashboard remained illuminated despite the RDL switch being selected "OFF"?

OJ.

The RDL only flashes, this has been happening since high country (12 months ago), but the locker definately engages. I tested the cables from sensor and they are good. When RDL switched to OFF the lights all go off but sometime it stays locked. Given the horrible noises I'm wondering if it is just partially locking so the sensor doesnt detect the locking?

Talked to another diff guy in Asquith who said he is happy to have a look at it and test the pump etc before diving into the guts of the diff.

[cookie9]

My difflock once came on cruising down the M2 at 100km/h. Got home OK. Turns out the breather was blocked with mud. Cleared the mud and actually installed extended breather and haven't had the issue since.
I know the cells area and there is a bit of mud about at times so it would not surprise me if the same had happened to you.

I checked the breather and was as clean as a whistle... dry as a bone at cells atm. Would be more then interesting in the wet, some steep snotty hills there!

[NJV6]

I am confussed, I have never seen a locking LSD that can be manually locked like a coventional diff lock.

OJ.

I have finally found the manual showing the RDL + LSD. This is for the small 9 in diff, the bigger 9.5 in diff has a few less clutch discs in it. A late friend has had them both apart getting the 'small diff' side gears resplined to take the 'large diff' axles as he kept breaking the small diff axles and was able to inform about the lesser number of friction plates in the big diff.

[Ent]

Having had the rear diff jamb on due to blocked breather I found that the electronic protection does not work well. It appears to believe that the diff is unlocked in that situation. Unless you reverse. In that case it blinks madly and indicates every condition possible.