The TM shows a few torque specs, and I'm not sure which one you need, so hopefully it is one of these - assuming you have the Hydrostatic transmission. If not, let me know and I can check the standard as well.. My guess is that you want the first one (Transmission to Tunnel Mounting Screw) below:
Transmission to tunnel mounting screw (38-50 ft lbs), Tunnel section to differential housing M12 Cap Screw (59-72 ft lbs) and Tunnel to clutch housing cap screw (95-115 ft lbs).