Dude, on my 455 AWS with a 60" deck and regular turf tires, I have approximately 3 inches between the lower lip of the mower deck and the rear tires. As for the maximum cutting height, here is snippet from a 60 Inch Serial No. (060001 -) manual.
Adjusting for Maximum Cutting Height
1. Stop tractor on a hard level surface, such as a cement
floor.
2. Raise mower to maximum cutting height.
3. Lock park brake. Stop engine and wait for all moving
parts to stop.
NOTE: Upward travel of tractor rear lift arms is limited
by the following stops:
• J-pins (A) (early model tractors -1995 or prior)
• lock bolts (late model tractors - 1996 and up).
Maximum cut height is achieved when one or both
J-pins or lock bolts are forced to contact the tractor
frame by movement of the rear lift arm.
Picture Note: Upper Photo shows Two Wheel Steer
Model; Lower Photo shows All Wheel Steer Model
4. Check to see if rear tractor lift arm forces stops to
contact tractor frame:
• If stops do contact the tractor frame, you need not go
any further.
• If stops do not contact the tractor frame, continue to
follow the steps listed below.
5. Start the engine and lower mower to the ground.
6. Stop engine and wait for all moving parts to stop.
7. Remove spring locking pin (B) and drilled pin (C) from
each tractor lift arm.
8. Turn each yoke (D) clockwise to raise both sides of
mower equally.
9. Attach yokes to tractor lift arms with drilled pins and
spring locking pins.
10.Start engine.
11.Raise mower to maximum cutting height.
12.Check to see if rear tractor lift arm forces stops to
contact tractor frame:
• If stops do contact the tractor frame, you need not go
any further.
• If stops do not contact the tractor frame, repeat steps
4–8.
13.Check mower level when above is completed:
I could not get the jpeg to load as it exceeds the 640 X 640 limit.
Hope this helps
Wayne