This is a fairly involved job. You will have to remove the brake assy, then seperate the ball joint and remove the axle assy. You will need a seal puller to remove the axle seal (At trans I assume) and a seal driver or something flat to install the seal. You will also need a 32mm socket ( if my memory is correct ) for the axle nut and a torx or hex socket for the brake caliper and a splitting fork for the balljoint. Be sure to tourque the axle nut to spec when reinstalling or you will be replacing a wheel bearing next. Hope this helps...Good Luck.
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OK, you must remove the front axle assembly to access the axle flange and then the seal, follow the instructions at the link but once the axle is out remove the axle flange from the front diff and replace the axle seal, use a seal driver and lube the new seal with lithium grease (white grease). You will need an air impact to get the flange nut off, replace it with a new one (do not reuse) and do not over tighten it. Cinch it down and then go about 1/8 more of full nut rotation to preload carrier bearing setting then spike in place. Ford F150 Front Axle Replacement Part 1
The premium replacement part for this is about $22.00. I would expect labor to be around 3 hours estimated in their magic book of hours. You can expect this to cost somewhere around 300.00 to 350.00. If you are handy at all and have tools you can do this for a few swear words and about 3 to 4 hours for about 100.00. I say 100.00 because there will be minor things that come up besides the part itself.
This is not easy....You will need air tools ,spray penetrate,seal remover,hammer,and Jack stands..Seal installation tool,.All proper tools..safety glasses.correct seal replacement.,new lock nut...Set park brake,block rear wheels,raise vehicle front and safely place jack stands under each side of lower control arms..Spray lube front drive shaft mounting hardware and lock nut that holds Yoke on front diff..Let it set to penetrate..put vehicle in neutral..Mark shaft to yoke location and direction perfectly because it has to be installed in perfect timing exactly how it was removed..,Remove drive shaft..Remove lock nut and yoke from front diff...You will have to hold yoke while removing lock nut because it will spin..PROTECT HANDS..( These can be VERY DIFFICULT to remove..Sometimes they have to be heated..You will need a yoke removal tool if it doesn't tap off with hammer...Mark exactly the yoke to spline location before removal..You can take close up photos however Mark it also to be sure...If you re-install it wrong it will vibrate terribly..Once yoke is removed You can remove seal.Make sure the new seal is correct...CAREFULLY..DO NOT DAMAGE SPLINES WHILE REMOVING..Sometimes even the perfect seal remover will damage splines..So cover it to protect spline threads..Clean all areas once seal is removed..Make sure nothing is pitted or damaged...Install new seal with installation tool..Lightly,perfectly tap it flush with diff..You can use old seal to install new seal if you don't have installation tool But only a pro should do that...Once in place Line drive shaft yoke with your marks and tap it on ..Use NEW LOCKNUT AND TORQUE IT TO SPEC..Install drive shaft as marked..torque to spec..Lower truck and check fluid..Complete..
Pulling and replacing a main seal on a crank cannot be done without "fancy" tools. If you go to www.autozone.com and make a free account and then put in the make and model and year, you will be able to access the free online repair guides. Also if there is an autoparts chain near you, you can rent those fancy tools.
Exhaust Gas Recirculating valve you can replace yourself with a couple hand tools. Axle seals usually don't go bad unless you wail a curb or pothole. Could be something else. after you change the EGR...get a second opinion.