Hi all - I have a 2012 LR2 with 150,000 miles on it, and love it so much that I'm trying to do all possible maintenance to prolong its life as long as possible!

I've recently done:
- oil and filter
- air filter
- rear differential oil
- automatic transmission fluid flush
- coolant flush
- spark plugs
- brake bleed
- power steering fluid reservoir and fluid change

But I'm struggling/debating if I should do any maintenance to the Haldex and/or front differential. Also, I've read about a "transfer case": is that the same thing as the Haldex, or something separate?

Is the front differential done the same way as the rear? (Remove fill plug, vacuum out the old fluid, and refill until it overflows?) Anything special about it? I can't seem to find any videos or instructions.

Likewise, I found a video on the haldex, but am not feeling very confident in it. Any advice would be much appreciated!

Are there any other maintenance items I should/could be doing? Thank you!

The front differential is part of the gearbox. I think you mean the Power Takeoff Unit. Yes, that and the Haldex will both benefit from fluid changes though the Haldex also has filters and a pump that need looking at.

awesomesauce wrote:

I can't seem to find any videos or instructions.

Likewise, I found a video on the haldex, but am not feeling very confident in it. Any advice would be much appreciated!

Are there any other maintenance items I should/could be doing? Thank you!

There are two versions of the Haldex in the FL2 - Gen 3 and Gen 4 - the pump motor (for the pump filter) and replaceable fiilter are in different positions.

Click image to enlarge

The PTU (front differential) doesnt have a drain plug so you need to suck the old oil out via the filler plug.
My advice - get the oil hot by driving it, makes it easier to suck it out - access is awkward. Jules

The PTU isn’t a differential. That is taken care of in the gear box for the front wheels. The PTU is a bevel gear set which takes the drive from the transverse rotating engine/gearbox through 90° to the propshaft and on to the Haldex and differential at the back axle.

Thank you all! That manual is a beast!

So, if I'm understanding correctly, there is a PTU to change the oil in (both sucking out and refilling via the same plug), and the Haldex (for which there is a filter to change, and fluid - again, in and out via the same plug).

BossBob wrote:

The PTU isn’t a differential. That is taken care of in the gear box for the front wheels. The PTU is a bevel gear set which takes the drive from the transverse rotating engine/gearbox through 90° to the propshaft and on to the Haldex and differential at the back axle.

awesomesauce wrote:

Thank you all! That manual is a beast!

So, if I'm understanding correctly, there is a PTU to change the oil in (both sucking out and refilling via the same plug), and the Haldex (for which there is a filter to change, and fluid - again, in and out via the same plug).

Yes, the PTU is attached to the gearbox and the haldex sits between the propshaft and the rear diff to which it is bolted.

The issue with the haldex is that besides the replaceable filter there is a small filter on the pump which gets clogged. The filter is cleanable when unscrewed from the pump after the pump has been removed from the haldex. Dont remove all 3 screws or else all the little parts inside the pump will fall out (guess how I know )




However some FL2's have a large flange on the end of the prop shaft which is so close to the pump it prevents the pump being removed and the propshaft will then need to uncoupled from the haldex (as was the situation in my case).




I had the large flange on mine replaced with the smaller earlier version to aid future servicing. Jules

Thank you, Jules!

And just to round things off. here is the newly attached older/smaller flange and new pump for comparison.


 Jules