Just do a search on the mercedes 722.315 transmission. I am sure it will come up on ebay or the 'net. The factory manual will probably be better. The 722.1xx ATSG manual is absolute garbage- the 722.3xx one looks better but I haven't actually tried to use it yet.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)