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					Originally Posted by  ahleeds
					 
				 
				So it isn't a sm420 but the earlier 31-48 predecessor. 
Normally I would buff up the gears and carry on ,but the rust ate 3 teeth off third and the rest don't look much better. 
If I was to run this pitted up gear set it would be so loud in the cab you'd need good ear plugs . 
Anthony 
			
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 Loud is normal, at highway speed I use a com set just to talk to the passenger. Straight cut gears in the transmission and transfer case will do that!