Thought I would share my progress on what is (to my knowledge) the first attempt at getting a locking differential installed in an MK.
As I've explained before the BLD function of the MK's works well offroad but with limited torque available sometimes the BLD causes the vehicle to bog out and lose forward momentum. If a mechanical device in the differential could transfer torque across the rear axle without as much loss in torque from the brakes being used I feel the MK's would gain a lot more capability offroad.
I have looked high and low for information on the rear diff in our MK's and while Aroundincirlces
found a place that lists out rear diff being a Chrysler 8.25"
Looking at the specifications I can't see it as really fitting, otherwise someone would have done it already!
I"ve also never been able to track down any interior pictures of the MK diff, as I will need to take the diff apart to measure all the spider gears pinion ect.
Here's what I have found so far, the mitusibish outlander (The newest ones) use the same differential as MK's I've established that by looking at ebay auctions for them and the diff is exactly the same as ours. The main difference being is gearing.
Since I have a FDII compass, the rear gear ratio is 8:1, which is incredibly low and I think this may ultimately limit my chances at getting a locker or something put it.
What I've done so far
Purchased a used differential out of a 2009 Patriot FDII with 37000kms on it. Basically the same mileage. Still waiting for it to be shipped out to me.
I have a mechanic friend who works at a Subaru and he hooked me up with the service manual on how to disassemble the rear diff, so I will post a few pictures of what it looks like:
As you can see it looks like a "normal" differential I just need to determine the size by measuring and the splines, if it turns out to be a 8.25" ring gear and say 27 splines, we are in luck as there are many options for that type of axle.
Diff has arrived!
Things to note, damn thing is a lot bigger off the vehicle and what pictures would suggest.
In the last picture you can see what I believe is the driveline vent, which apparently is higher on FDII modules. It looks like nothing more than a small rubber tube, that in theory could be extended and relocated to an ever higher position to increase water fording capability.
I have a couple emails out to a few companies regarding information on lockers and or LSD's hopefully I get some positive feedback soon.
23 Splines is what I count, so until I get the diff ripped apart I have this info to go on for now.
So I measured the ring gear and it came out at exactly 6 inches. I suppose I might have to take the carrier out too, however that is far above my mechanical skills to try that so someone else will have to do that if it will be necessary.
Some more pics though:
Picture of the roll pin we couldn't punch out"
The final piece of the puzzle
Cross Pin diameter = 0.587"
Spider Gear Hole diameter = 0.592"
I'm hoping for good news
PS other diff was a Dana 44
I have been in contact with Lokka and they had requested the specs which I have outlined above, so hopefully now I can get something made up, and be the first MK with a locking Diff!