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Don’t really know. The part number I came up with was T2P1783. Perhaps the inexpensive one is a rebuilt, and the other new.
Oh ****. I may have been looking at the LSD for automatic gearboxes. Seems like T2R4000 is for automatic and T2P1783 is for manuals?
Why is there a difference? And why is the manual one so much more expensive? Is there any possibility that it is the same physical component but with different part numbers?
Oh ****. I may have been looking at the LSD for automatic gearboxes. Seems like T2R4000 is for automatic and T2P1783 is for manuals?
Why is there a difference? And why is the manual one so much more expensive? Is there any possibility that it is the same physical component but with different part numbers?
I don’t think that’s the difference. There’s no reason why the manual diff should be any different than the automatic diff. Both those parts are listed as RWD, so I have no clue what the difference is.
There’s no reason why the manual diff should be any different than the automatic diff.
There is - robustness. Automatic gearbox does not drop the clutch, sending shocks through the drive train. As such, you can design automatic differential to be less robust.
I don’t think that’s the difference. There’s no reason why the manual diff should be any different than the automatic diff. Both those parts are listed as RWD, so I have no clue what the difference is.
Originally Posted by SinF
There is - robustness. Automatic gearbox does not drop the clutch, sending shocks through the drive train. As such, you can design automatic differential to be less robust.
My worry is that different ring gears might not be swappable across differentials.
Not possible to fit the LSD for V6 with automatic gearbox, T2R4000, to a manual F-Type V6 without changing halfshafts and propshaft as well.
However, the V6 base and V6S share the same part numbers for propshaft (T2R7545) and halfshafts (T2R7755 and T2R7756), which indicates that the LSD for the manual V6S should fit (T2P1783).
So now comes the challenge of trying to find a used one, or just bite the bullet and order a $3000 new part (which btw in Sweden is ~$4500). Not 100% sure yet which way to go.
EDIT: Realized I posted this in the wrong thread. Sorry about that.
@Cambo@Unhingd and other Forum Folks interested in a helical LSD solution.
I have re-engaged Quaife (Kevin Wilson) and they are reviewing the helical carrier specifications.
Our hope is to develop a solution that can cover a wide range of Jaguar AdvanTEK rear axles.
So far I have the 3.15 open, and the 3.31 friction LSD carriers covered... and I will pull my F-Type's open 3.31 eventually.
I'd love to inspect some other gear ratios from other Jag's, to document their ring gear offset dimension (the one key dimension that changes with gear ratio in the DANA 44 system)
But I'm several $k into this project and would appreciate some other folks offering up some investment.
I'd suggest purchasing a few rear diffs from XE/XF/XJ etc models that have ratios different than 3.15 and 3.31... then tear into them and take a few measurements.
Note: I also have MFactory in Taiwan looking at this application and they will return with their engineering assessment this week.
I developed a set of special tools, a custom shim kit, and a repeatable assembly sequence for the rear differential. I've been practicing on the two diffs on my work bench.
I'm not sure this would be a task for a weekend mechanic, and not sure sending a rental tool kit around the world will work.
So it is probably best if one Forum member sets up a "rear differential rebuild service" that disassembles / cleans / installs and then sets gear back lash and bearing preloads.
This service may need to start with an initial stock of of rear diff ratios, and then take back the used rear diff (with a core charge?) from each customer to replenish the stock.
