You may find that you need to design your own gearbox case which will reduce the design compromise.
I would try using solidworks simulation express an simulate the arms been subjected to a side load to see where stress concentration is on the arm and what load it will fail at. And then simulate it wit a fixed point benhind the wheel and see how much the stress in reduced and the max laod it will take. It would be better to use the professional simulation tools that SW provide as you and section the mesh and put differnt type of fixings in the simulation.
P.S I would also put in all the fixings you are using, in the model. If you don't have SW toolbox use the mcmaster carr site they have all the screws nuts and bolts modeled up.
I learnt the hard way in engineering why you need to put the fixings in assembly.....
A reading list.
You should also get your hands on a copy of Milliken's Race car vechicle Dynamics.
Heinz Heisler books on advanced vehicle technolgy and a copy of the latest edition of the bosch automotive hand book.
And the latest edition of the machinery handbook for a basic referance of engineering standards and calculations.
Also get a copy of roark formulas for stress and strain.
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