pinion gear marked 877??

what axle is it? d44, d60, d70. AAm 11.5? Sterling?
 
put up some pics

but Those number sound like it has to do with how to set it up (as said above)
 
I bet that both of them have the same number, but you are reading it wrong. That particular number simply matched THAT pinion to THAT ring gear. The only numbers on a Dana 35 that have anything to do with setup will be the pinion variance number. That will be a number ranging from -3 to +3 and will be on the pinion. Some aftermarket gearsets will have a nominal measurement engraved also.
Post a pic and I'll give ya the info you are looking for.
 
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