I want to replace the bushings that are on the steering linkage or tie rods? How hard/difficult is that to do? Any special tools needed? I have a bunch of grease coming out of the bushings and I can tell they are way worn. but they are 30 years old!

btw its a 78 f150

 

I'm assuming you mean the tie rod boots. It's not hard at all. The only special tool you'll need is a torque wrench and -maybe- a tie rod or gear puller.

Grease coming out of the boot may just mean whomever serviced it last simply overfilled the boot with grease. No biggee... just wipe off the excess. To verify the tie rod does need replacement, grab some channel locks and try to compress the tie rod. Also wiggle it back and forth. It's a ball and socket assembly (like your hip joint).

Another way is to have an assistant slowly turn the steering wheel while you are observing the tie rod. Everything should move in unison. If the tie rod starts moving but the steering arm is lagging, then you do have worn tie rods... another symptom is the vehicle wanders at speed and needs constant steering wheel input to maintain a straight line... but that could also be a multitude of items like the steering box, alignment, center link, or other bushings.

Before disassembly, measure or count how many threads are exposed. Now remove the cotter pin and loosen the nut but don't remove it - even it up with the top of the stud and whack it with a ball peen or maul downwards to push out the tie rod. If you're just replacing a torn boot, use a tie rod puller or gear puller to pop it out so ya don't damage the threads. Poly boots are like $10 for a pair.

Like they say, reassembly is the reverse of removal. Go get an alignment afterwards.