Thread: rear e-diff

Originally Posted by Graeme

That control unit part number is listed for the RRS VIN DA786425 which is in the MY13 range which is the original L320 RRS and also for MY13 L405 and some D4s and the L322. LR034525 appears to be the one that you need.

Assuming that you're looking to source a used e-diff, I suggest that you get both the complete e-diff and the control unit out of any pre MY17 (to be safe) 3.0 V6 L494 or probably L405 although you will still need to confirm that it has the same diff ratio as your vehicle. You could do this by checking that the front diff part numbers for the 3.0 V6 are the same whether the rear is open or e-diff. My copy of Microcat 2012 lists only 1 front diff for the MY13 L405 3.0 V6 (LR039597 now superseded many times so perhaps still current) but no rear e-diff is listed for this vehicle which could be an error in the catalogue but the 3.0 V6 in your MY16 L494 could use a different ratio anyway.

The e-diff motor that is fitted to the e-diff will be the correct one, just be sure that its connector isn't damaged.

Thanks Graeme, that’s helpful.

I've found a a car one suburb away from me that might fit what I’m looking for. He has asked for a parts list but I’m having trouble finding a site that can give that to me. He also mentioned the ediff motor is the same regardless of the rear centre diff ratio but I doubt that’s correct.
If I’m reading this correct I need;
Ediff motor from the rear diff - part number ?
Ediff module - part number LR034525
Ediff harness between them.
Would you know of a site I can put my vin into and also a vin of a HSE Dynamic v6 diesel car that can show me the different part numbers ?

So you have found sound someone wrecking a L494 RRS with the Dynamic Pack? That would be a lucky find.

This link has a project to convert a D4 to install the genuine e diff - not all that easy - yes a D4 not a L494 but gives an idea of whats involved.

LR4 Factory Locker Swap | Expedition Portal

The e-diff motor is indeed the same regardless of the diff ratio as the motor turns the internal mechanism to apply pressure on the clutch plates, nothing to do with the drive itself. Don't use an e-diff motor from a L320 or D4 etc as it appears to have been revised for use with ETM. Just get the whole diff housing complete with its motor if the e-diff has the same ratio as your vehicle. IIRC the ratio is stamped on a tag on the diff, well it was for mine.

I'll see what I can discover about the 3.0 V6 front diff ratios but a visit to your local LR dealer parts dept with your VIN and the proposed donor's VIN to check if the front diff is the same part number for both vehicles.

I retrofitted an e-diff to my L322 so have some experience with this task.

Both my original open diff and the acquired e-diff had original paper labels attached that showed the ratio.

Get a much of the e-diff and control unit wiring that you can, back to other connectors if possible.

Whilst it appears that somewhere between the start of MY2016 and the start of MY2017 the L494/L405 front diff was changed such that the later diff isn't suitable for the earlier vehicles and vice versa, L405s and L494s fitted with the TDV6 diesel have been fitted with 3.21:1 ratio front and therefore rear diffs since the beginning of the model and at least up to the end of MY17. Hence an e-diff from MY17 or earlier will have the same ratio as your vehicle and one from MY18+ may still have the same ratio but would need to be verified.

Edit: The rear diff is also reportedly changed for 2017 models so perhaps there was a ratio change. With your vehicle MY16 I'd be looking for a sticker on either the front or rear diff of your L494 and a sticker on the front or rear of the proposed donor to confirm the ratios rather than rely on supplier web-sites.

Originally Posted by Graeme

Whilst it appears that somewhere between the start of MY2016 and the start of MY2017 the L494/L405 front diff was changed such that the later diff isn't suitable for the earlier vehicles and vice versa, L405s and L494s fitted with the TDV6 diesel have been fitted with 3.21:1 ratio front and therefore rear diffs since the beginning of the model and at least up to the end of MY17. Hence an e-diff from MY17 or earlier will have the same ratio as your vehicle and one from MY18+ may still have the same ratio but would need to be verified.

Edit: The rear diff is also reportedly changed for 2017 models so perhaps there was a ratio change. With your vehicle MY16 I'd be looking for a sticker on either the front or rear diff of your L494 and a sticker on the front or rear of the proposed donor to confirm the ratios rather than rely on supplier web-sites.

Thankyou.

In NZ I have found a Sport L494 SDV8 with the locking diff as std and is a MY16.5, vin SALWA2JE8GA586201

The part number from this VIN lead us to the following;

EModule - ECU
LR057232 Superseeded to -> LR083860

eDiff
LR058406 Superseeded to -> LR070147

Loom
LR075618 Superseeded to -> LR089079


Any thoughts ? as it seems to fit the spec required. cheers

The SDV8 has higher ratio diffs so its e-diff is unsuitable for your TDV6.

LR075618 appears to have been superseded by LR089679.

The harness picture that I found appears to have connectors very similar to the 2 that connect to the ediff. If you're lucky its 4 large connectors may connect to existing connectors in the main harness in which case other connectors may also exist for the control unit. You might want to go looking for the 4 black connectors and the control unit connectors (black, yellow and purple of the same design if same as earlier vehicles) in the rear of your vehicle. One or more of the 4 larger black connectors may already be in use.

Originally Posted by Graeme

The SDV8 has higher ratio diffs so its e-diff is unsuitable for your TDV6.

LR075618 appears to have been superseded by LR089679.

The harness picture that I found appears to have connectors very similar to the 2 that connect to the ediff. If you're lucky its 4 large connectors may connect to existing connectors in the main harness in which case other connectors may also exist for the control unit. You might want to go looking for the 4 black connectors and the control unit connectors (black, yellow and purple of the same design if same as earlier vehicles) in the rear of your vehicle. One or more of the 4 larger black connectors may already be in use.

Thanks again. I will try and have a look.

I might be missing something but the tag on the back of my car is SDV6 which I thought was the v6 version of the SDV8. I didn’t think I had a TDV6. Thoughts ?