So I installed the diff and slipper over the last week as the parts arrived. Everything was in good order except the clutch spring that came with the double was terrible... unusable in fact. It was uneven and didn't (couldn't) sit flat even after some aggressive compression with pliers. That went in the bin and I used the kit 511 spring which is perfect for the task.
I first set up the clutch and I had snow, wet grass and drying asphalt to use so it was perfect. Ultimately there's only one adjustment for the clutch so front and rear will always have the same action with the same pads. I'm not sure if there are alternative pads that fit but for the time being I find it works well. If alternative pads aren't available then I suppose we can adjust at the diffs.
I used 10K oil in the front diff and thank HeavyD99 for pointing out my error earlier - if I'd tried 1,000K it would have been uncontrollable. As it stands I think I'll need to drop down to 5 or 7K oil, with 10K it's so direct it does pinwheels on the inside front on high traction surfaces, lifts the outside front and flips over itself - it's mental (and a bit of fun when you learn the 'tipping point' - 90 degree turns on a dime anyone?
).
The double clutch certainly helps with different diffs at either end... with the gear diff in the front it's very direct and I needed a little more slip or it would be dragging the rears too often. It's really obvious how well it works when you land front wheels first off even a small jump as the rears get traction almost immediately they make contact without trying to catch up with themselves and throwing the nose out.
To be honest, if you were running two ball diffs with similar tightness then I don't think you'd notice or benefit much from the double clutch.
This was just the first break-in run, I need to strip the drivetrain down this week and make sure it's all good but it feels tight so I'm pretty happy. I'd hoped to be able to tune the suspension as well today but as you can see it got a bit clogged up in the only area I had enough space...
