1998 Toro groundsmaster 3000d 4wd transaxle problem

I have a 1998 Toro groundsmaster 3000d 4wd which is driven by a Sauer Sundstrand m15-iht. Inside the iht is a differential with spider gears just automotive differentials. My problem is I cannot find the parts to repair the spider gears. The stamp on the differential appears to be Auburn gear differential, see pics. I cannot find info pertaining to these units to replace the spider gears. I know they are 27 spline. Any info would be great. Thank you

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1998 Toro groundsmaster 3000d 4wd transaxle problem