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Status of new units, been on the waiting list since just after the first run ran out. He has been a bit quite recently. Hopefully getting new units ready, but haven't heard anything.
I'd like to put my name on the waiting list if another production run is possible.
My '16 V6S has been in the shop waiting on a remanufactured diff from Jaguar for the last 6 weeks, but I just learned that they have 0 stock and are on international backorder with no available lead times.
My '16 V6S has been in the shop waiting on a remanufactured diff from Jaguar for the last 6 weeks, but I just learned that they have 0 stock and are on international backorder with no available lead times.
That's more detail I got from my Service Advisor not quite four weeks ago. I just heard "there are none available" and didn't ask what that really meant. Mine would probably have been even worse because I expect they'd have looked up the number specific to the 6MT, although comparing zero to zero is an exercise best left to mathematicians and philosophers.
@Kemistri
Your interest in a Quaife equipped rear differential for your V6S is quite timely!
I am sorry to hear that new LSD units from Jaguar are no longer available.
I have recently developed a relationship with a rebuilder of Jaguar rear differentials to expand the availability of the helical geared rear diff for modern Jaguars.
Simply Performance, in Beare Green UK, is in the final stages of providing rebuilt rear differentials with the Quaife ATB helical geared carriers.
They have a rich history of refurbishing Salisbury 4HU and 4HA differentials at OEM quality standards for older Jaguars (1960-2002). https://www.simplyperformance.com/about-us
Simply Performance has just ordered a batch of Quaife ATB's, so units are not "on the shelf" yet.
I will get back to you about the earliest possible availability.
Just for background, what issue did your V6S have with its rear diff?
Was it bearing noise, front seal leak, or other?
Is your car able to move, or is it "diff-less" at a Jaguar dealership?
@lizzardo
I hope your car is in good order. Any concerns with your Quaife equipped 3.31 unit?
Yes, the 6MT rear diff is a separate part number from the 6AT cars. (one is a 3.31 open, the other is 3.15 open)
But I think the 6MT S model is the same p/n as the 6AT S model (both are the 3.31 ratio LSD type)
@Zen Beer I haven't forgotten about you (or several others on the wait list). Look for a broader announcement on a new thread.
Drive well,
Herman Wiegman
Onca Engineering
Last edited by Onca Engineering; Aug 17, 2025 at 09:48 AM.
@lizzardo
I hope your car is in good order. Any concerns with your Quaife equipped 3.31 unit?
Yes, the 6MT rear diff is a separate part number from the 6AT cars. (one is a 3.31 open, the other is 3.15 open)
But I think the 6MT S model is the same p/n as the 6AT S model (both are the 3.31 ratio LSD type)
M y car is indeed in good order, and I have no concerns with the differential. It is the Onca S/N #007, and is -AA coded. My understanding is that the 6MT S model was unique in using the -BA coded unit. I'm basing that on research of your from five years ago, so that may very well be superseded by your experiences installing the Quaiffe units.
My recollection is that you hadn't run across any differences between the two, both friction-type, both 3.31, and I can attest to the fact that they've completely interchangeable.
I don't even have 1000 miles on mine yet, given that my daily commute has gone from ~50 miles/day to zero. When I hit that I'll change out the fluid. There are lots of gears in there that need to get acquainted with each other, so that seems a reasonable first change. I've yet to decide what a normal interval will be. Perhaps 30K miles with synthetic?
Just for background, what issue did your V6S have with its rear diff?
Was it bearing noise, front seal leak, or other?
Is your car able to move, or is it "diff-less" at a Jaguar dealership?
Their diagnosis is that the pinion bearing failed, which caused a steady whirring noise based on acceleration. Apparently, they're not allowed to open them up or touch anything within the carrier assembly other than the pinion seal.
Its currently sitting in their possession with the exhaust removed to save on labor.
Its at 51k miles and will need new clutch plates as well which further pushes me to invest in your ATB solution.
Im glad to hear you're working with a final rebuild provider. Hopefully they will have access to enough cores to rebuild as I imagine they'll have an influx of customers when the deal is finalized.
Happy to help in whatever capacity I can. We need more F Types on the road.
Their diagnosis is that the pinion bearing failed, which caused a steady whirring noise based on acceleration. Apparently, they're not allowed to open them up or touch anything within the carrier assembly other than the pinion seal.
Its currently sitting in their possession with the exhaust removed to save on labor.
Its at 51k miles and will need new clutch plates as well which further pushes me to invest in your ATB solution.
That's about the mileage I started hearing noise from mine. I haven't looked inside but I was still getting some LSD action so the plates weren't completely worn. I expect they're fairly far gone though.
@Kemistri
Your interest in a Quaife equipped rear differential for your V6S is quite timely!
I am sorry to hear that new LSD units from Jaguar are no longer available.
I have recently developed a relationship with a rebuilder of Jaguar rear differentials to expand the availability of the helical geared rear diff for modern Jaguars.
Simply Performance, in Beare Green UK, is in the final stages of providing rebuilt rear differentials with the Quaife ATB helical geared carriers.
They have a rich history of refurbishing Salisbury 4HU and 4HA differentials at OEM quality standards for older Jaguars (1960-2002). https://www.simplyperformance.com/about-us
Simply Performance has just ordered a batch of Quaife ATB's, so units are not "on the shelf" yet.
I will get back to you about the earliest possible availability.
Just for background, what issue did your V6S have with its rear diff?
Was it bearing noise, front seal leak, or other?
Is your car able to move, or is it "diff-less" at a Jaguar dealership?
@lizzardo
I hope your car is in good order. Any concerns with your Quaife equipped 3.31 unit?
Yes, the 6MT rear diff is a separate part number from the 6AT cars. (one is a 3.31 open, the other is 3.15 open)
But I think the 6MT S model is the same p/n as the 6AT S model (both are the 3.31 ratio LSD type)
@Zen Beer I haven't forgotten about you (or several others on the wait list). Look for a broader announcement on a new thread.
Drive well,
Herman Wiegman
Onca Engineering
Hello everyone,
I bought the V6 base recently and fitted the upper and lower poulie from paramount alongside the sport cats from them too and while the car is getting a full ppf now I started to look for an LSD
The one thing that does annoy me is coming from an M2 into the F type is the open diff, I got the auto V6 base and was really expecting that this car would have an LSD (didnt push the car on the test drive) so after having the car for a couple of days I quickly found out that it had an open diff. After doing some looking online I landed on this forum and glad to see that there is an LSD option.
If possible I would like to be added to the waiting list for one unit please?
I bought the V6 base recently and fitted the upper and lower poulie from paramount alongside the sport cats from them too and while the car is getting a full ppf now I started to look for an LSD
The one thing that does annoy me is coming from an M2 into the F type is the open diff, I got the auto V6 base and was really expecting that this car would have an LSD (didnt push the car on the test drive) so after having the car for a couple of days I quickly found out that it had an open diff. After doing some looking online I landed on this forum and glad to see that there is an LSD option.
If possible I would like to be added to the waiting list for one unit please?
Best regards,
Johan Akkerman my new pride and joy
Hi Johan,
nice to see a fellow dutchman here!
Waar kom je vandaan? Ik uit Groningen.
I also have the base V6 which I’m converting to a LSD. You can also track down a LSD from a V6S (EX53-4A213-AA). It will drop in (after some heavy lifting and wrenching). I have found one under €500, but I was lucky they didn’t know what it was, but around €1000 must be possible. It will be a lucky shot, since the friction plates wear. A rebuild for around €1000 of you want to be sure.
Johan,
Very nice blue F-Type.
Upgrading to a helical geared, torque biasing rear diff, will make your V6 F-Type perform so much better.
The traction will be much better at the rear, and the car’s TracDSC mode works well with the helical rear diff to achieve moderate slip angles under hard acceleration.
The original V6 S models did come with a friction based LSD, but it was unreliable and often failed before 40 kmiles.
This is why I developed the maintenance free Quaife ATB option for our cars.
nice to see a fellow dutchman here!
Waar kom je vandaan? Ik uit Groningen.
I also have the base V6 which I’m converting to a LSD. You can also track down a LSD from a V6S (EX53-4A213-AA). It will drop in (after some heavy lifting and wrenching). I have found one under €500, but I was lucky they didn’t know what it was, but around €1000 must be possible. It will be a lucky shot, since the friction plates wear. A rebuild for around €1000 of you want to be sure.
Nice car! Perfect color!
groeten Adam
Thanks for the Advice Adam, just scooped up an -AA diff from ebay for 450gbp! Im from Utrecht region so when you are around feel free to let me know.
Herman, I just send you an email regarding the upgraded helicoil diff!
It is with some excitement that I am making this announcement to those on the Jaguar Forums who have shown interest in the helical geared rear differentials. Your patience is appreciated. I have worked with Simply Performance in the UK to provide fully rebuilt rear differentials. This offering is more refined than the original batch of units built by Onca Engineering. Please contact Simply Performance for additional information.
Drive well,
Herman
==========
Simply Performance, with support from Onca Engineering, is expanding their range of rebuilt differentials to include the Dana 44™AdvanTEK units found in modern Jaguars from 2012 onwards. The initial focus of this new offering is predominantly on the V6 models, along with some V8 and I4 applications. This offering also includes an optional upgrade for a maintenance free, helical geared Quaife ATB differential for select gear ratios.
Over the past 18 months, there has been dwindling support from the OEM and supplier for these differential units. Simply Performance will fill the emerging need for quality rebuilt rear differential units. The process will start with a full strip, clean, blasting and paint of the core unit. Next, all bearings and seals are renewed with OEM quality components. Finally, the unit is re-assembled and adjusted with shims and external fasteners.
Contact Simply Performance for more details.
Ebay shop: Simply Performance
About Simply Performance: A family business based near Dorking, Surrey UK focusing on Jaguar parts for classic Jaguars. Simply Performance has supplied differential repair services for the last 15 years and has historically focused on a select range of differentials; the Salisbury 4HU, 4HA, 15HU and 14HU. These were originally made by Salisbury Axles in Birmingham, UK, now owned by Dana. Simply Performance is now leveraging this experience to expand its rebuilt differential product range with its dedicated team.
