Jim, as you know I have a D-225 in my current 3A build with T18.
The front of engine was dropped as low as possible for hood clearance and the transmission was raised as far as practical for ground clearance. I have standard rebuilt (not re-arched) 10 leaf Mathers front and rear. No lift.
Right side of D30 axle hits axle bumper just before the propeller shaft hits the bell housing at the starter area.
1-3/4” clearance at rest. If I have any problems with prop shaft and bell hitting together I will simply add a shim to lower the axle bumper. Otherwise I want as much axle travel as I can get.
Edited by oldtime - 30 Sep. 2022 at 8:14am