I'll give you a call today. For others that might have the same issue, read on.
In short, the collar we offer will work on the Strange Ultra case.
The two main issues though are;
1)typically the yoke has to be removed to facilitate easier installation.
2) you have to carefully align the collar with the hole in the pinion support where the sensor mounts.
To help issue #2, Strange actually makes a collar that has "lip" on it that acts as a spacer so that all you have to do is slide the collar all they way on and the sensor alignment will be correct. The collars we offer do not have this "lip".
Below are some more details on the issue.
STRANGE ENGINEERING ULTRA-CASE REAR ENDS
The Strange Ultra-Case rear ends use a non-conventional method of mounting the sensor and split collar with magnets that are used to monitor the Drive Shaft RPM. Strange has manufactured a special collar which employs a spacer lip with a wide inside radius on one side that allows it to fit tightly up against the pinion gear. The collar is mounted deep within the housing. This special Ultra-Case split collar must be purchased directly from Strange Engineering. In addition, to provide a mounting position for the sensor that will align it with the magnets in the split collar Strange has drilled and tapped a 5/16-24 hole in the outer perimeter of the 12 bolt flange of the pinion support housing.
Mounting the sensor in this manner affords a nice stable mounting platform for the sensor, but there is one drawback to this arrangement. Installing and removing the sensor is very difficult. The depth of the hole in which the sensor is mounted is almost as deep as the length of the sensor itself. This leaves very little room to hold onto the sensor when installing it. You are forced to try to grab it by the heat shrink covered pigtail wire, and that is an invitation to break the wires off of the end of the sensor.
Some racers have eased the installation and removal task, and lessened the potential for damage, by machining the area around the sensor mounting hole. They have enlarged the countersunk portion of the sensor mounting hole up to .500” in diameter. The countersink was also plunged to a depth just slightly above the horizontal threaded hole for the sensor locking set screw. By enlarging the size of the countersink there is more clearance to hold on to the sensor, plus it removes the potential of the sensor’s heat shrink contacting the side of the hole making it hard to turn. It is highly recommended that you do not attempt to cut the heat shrink off of the sensor as it is used as support for the wires.
If you choose to follow this suggestion the job of machining the pinion housing should be performed with the housing removed from the rear end. This will allow you to thoroughly clean away the machining chips once the job is finished. It will also permit you to reinstall the pinion housing with the sensor pointing in any of the twelve locating positions available through the symmetrical 12 bolt flange.
A final word of caution. If you use the set screw that Strange has provided to lock the sensor in place, be very careful. Keep in mind that some sensor housings are made of a plastic material, and if the set screw is installed too tightly it can damage the sensor. Putting a small dab of silicone on the threads of the sensor is usually sufficient to prevent the sensor for moving once it is installed.