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1) Where is the spacer position?
Is the spacer between the crownwheel and diff carrier flange (Unlikely I think)
or is it behind the load side taper roller bearing?
2) Is there a website that lists all the various thickness spacers to position the crownwheel?
I will need to purchase all the spacers so that when my local Ford dealership is doing the work they will have the required thickness spacer on hand to setup the old crown wheel on the new Raptor Torsen Diff..
I'm trying to interpret the different wordings you are using verus what's commonly used here in North America: your "crownwheel" I assume is "ring gear" for us.
There are two primary locations in the Ford 8.8/9.75 axles where shims are used:
1) Between pinion gear itself and its bearing (pinion depth shim)
2) Between each differential side bearing (both sides) and the carrier/axle housing (backlash shims)
Unfortunately, each differential setup may be different due to mass production manufacturing tolerances, so the required shims will differ.
Since you stated you are re-using the ring (crownwheel) and pinion gears, you may not have to worry about the pinion depth, but you still need to have them check it.
As for the differential side bearing shims, you should start off with attempting to use the original shims from your axle with your new Torsen differential. If your backlash needs to be adjusted by shimming, you subtract shim thickness from one side while adding that subtracted thickness to the other side (e.g. -5mm shim from driver's side, +5mm shim to passenger's side); the amount of thickness depends upon how much differential movement is needed, and in which direction, to correct the backlash.
Since you have no idea what your new Torsen adjustments will be, the only thing you can do is purchase a variety of different shim thicknesses. I suggest the Yukon Gear & Axle SK SSF8.8-B Solid Spacers, Shims & Shim Kits (the part number I provided is specified for 2015+ 8.8's, but you should verify the correct kit number for your front 8.8 axle), and provide this to whomever will be swapping out your differentials.
If your pinion depth needs to be adjusted, then the Yukon Gear & Axle (SK 25300) Pinion Depth Shim would be needed (again, verify the kit number for your front 8.8 application).
Thank you, the photo of the diff & spacers says a 1000 words.
I received a call from Ford on Thursday saying my Raptor front diff and bearing was available in their stores, I am picking them up on Monday.
I am waiting on Tasca for the shims.
Last edited by David Ferreira; Jun 28, 2020 at 01:48 AM.
I finally got to trail my new setup last weekend. I've had so much done to it from stock since my last offroad adventure (which was an intensely difficult trail near Lake Arrowhead, all on a stock suspension) that I don't know if I could tell any difference with the new limited slips, both front and rear, but then again, the trail was only a moderately difficult forest service mountain fire road, about 15 miles in length, though had an elevation change of +5,000 feet.
I probably need to hit some dunes or some slippery steep mountain inclines to really exercise the new diffs...
