I'm using a one inch driveshaft between the hydros. That should reduce any flex. I have mounted a pillow block as well. I wanted to bolt the pillow block directly to the front rear as there are bolts already in the top but the bearing was too tall to fit.
The engine is a K582 Kohler. 58 cubic inch opposed twin. It came off a Jacobsen commercial reel mower that was used by a golf course. I wanted to use an electric clutch to disengage the drive during start up but the 1-7/16 shaft size presents a problem. Not truly impossible to find one but at $350 I decided to put a manual release on it.
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