what type of rear axle do i have in my 1985 ford f250?
Cold Air Intake is a device to allow cold air into the engine. It works when the air is from a source much colder than within the engine bay Ram Air Intake id a device to allow air into the engine when the vehicle moves forward. It works when the vehicel is moving forward If the ambient air temperature is at least 5 degrees Celcius below that in the engine bay, you may feel the enhanced performance (do not bother with this if often drive in the afternoon) If you drive above the designed road speed according to the RAI you installed, the improved performance may be felt (don not bother with this if often caught in traffic jams)
if you have a 8 bolt wheel it is not a 9 9 is on 5 bolt wheels only most likley it is a dana 60 look on top of the housing for cast numb ie 44 50 60
Axle code is on tag at hoghead, also on the vin sticker on the door. In 85 Ford printed all of this code info in the veh owners manual, if you are lucky enough to still have it. Otherwise you will have to find some one to translate it by looking it up. Dealer, junkyard, etc.
The stock intake is designed to be quiet even if it sacrifices a little bit of air flow and the air is usual sucked in from the hot engine bay. CAIs are designed to allow the maximum flow possible and get the air from the coldest practical source with no regard to noise.
