ok my newest truck ever so i got a few questions.. its got the 351w carb from factory its 4x4 it came with a aod and now a c6 would that cause it to spin 3500rpms at 55 the guy i bought it from said the rearend or frontend gears havent been messed with. so what gears do these years normally come with? its got the 8.8 rear end.. also on the rearend its got a plug .. is that rear anti lock or my buddy was tellin me about some electronic possi thing...? also has 33x12.5x15 mud kings basically im new to these newer trucks.. so any help thanks

 

Ford Axle Code Chart .: Articles This may help you if you get the axle code off of the door sticker. Also the AOD would have had overdrive while your C6 does not so engine revs are going to be higher.