Jon-I went thru the same learning curve with a panzer mk1 I built on a carrier chassis.  I ended up building a second panzer tank and in order to get the drive right, I flipped the axle upside down to reverse the direction.  this saved having to go thru another transmission that was put in reverse.  I like the new driveline a lot better.  I also used hydraulic steering on the second one-a big improvement! 
 
John
		 
		
		
		
		
		
		
		
		
	
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