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Have the tires straight, lock or secure the steering wheel so it doesn't move. Remove the hoses and steering linkage from the box. Raise the front and remove the drivers tire. Remove the linkage from the pitman arm at the bottom of the box. Use a large hammer to break the linkage free from the arm, don't hit the threads. You will see 3 or 4 large bolts going threw the frame, remove them to drop the box. You will need a pitman arm removal tool to get the arm off the box. You can rent them from the parts store. New boxes come centered, so install the box first, then put the pitman arm on, matching it to the linkage.
It's an easy but physically demanding if you do not have a pneumatic set of tools. The specialty tools you will first have to get your hands on are a Tie Rod remover. otherwise know as a (pickle fork). There are two sizes of these large for ball joint removal and small for Tie rod removal. Looks like a big 2 pronged fork. The next Tool is a Pitman arm remover. Usually you can rent or barrow them from your local auto parts store. Drive your blazer up on to a set of repair ramps. Block the rear tires.The bolt to the center link from the pitman arm has a crown nut on it with a cotter pin going threw it. Remove the cotter pin.and remove the crown nut. Then with the Pickle fork and a 5 lb. sledge hammer. place the pickle fork between the center link and the pitman arm bolt. Give the end of the Pickle fork as many good blows on the other end as it takes for the center link to release from the pitman arm. Once that is done take a break I know you'll need it. Next is the Pitman arm to the steering gear shaft. Hope you can get your hands on a good breaker bar or an impact wrench and a socket large enough for the steering gear shaft nut. Remove the nut. Then place the Pitman arm removal tool between the pitman arm and the steering gear housing. Start tightening the threaded rod the remover up against the shaft. It is hard as hell to remove because pitman arms rarely go bad. It's usually the center link that fails.It will take a lot of strength to remove and you may want to use a little penetrating lube on it. Once you get that off you may want to replace the steering gear shaft seal as well. Otherwise just reverse the removal steps. The shaft is notched and so is the pitman are make sure they line up. then Torque to spec.s If you plan on keeping the blazer get a repair manual from your auto parts store. It will help you put a great deal.
You dont remove the gear box to remove a pitman arm. They have a tool called a pitman arm remover. That is what you do the job with. Remove the cutter pin and nut from the one end. Then use the tool to finish removing the part.
remove the p/s lines to the gear box, take the nut of the pitman arm and seperate the center link of the pitman arm, remove the front shield, remove three bolts from the side of the frame holding the gear box onto the frame, you will need a puller to remove the pitman arm off the gearbox, reverse procedure to install. add fluid.
yes you will have to remove the pitman arm and turn the gear box so that it turns more to the right. it has slots so align it on the next slot to the right. they make a tool that they call a pitman arm puller that raps around the pitman arm and puts pressure on gear box shaft wile turning it clock wise. you'll figure it out once you see the tool. the big nut usually takes 1 1/4 inch socket. hope this helps
Once you have the arm removed (use a puller made for that) You need to remove the c clip retainer. Many times you can loosely install the arm, put it back on the ground and with a catch pan under it, just quickly turn the wheel and pressure will drive the seals out. If that does not work, you can use long self tapping screws and put one into each side of the seal and pull it free. Most i've seen always have two seals separated by a steel flat washer. To re-install, you need to carefully drive the seal back in using a piece of pipe or anything that fits and does not damage it. I have special tools I made long ago to do that but the trick is to be careful not to get the seal too far in on any one side and to not damage it in any way. Likely someone makes an install tool. Make note of the order of the seals as you remove them and make a reference mark on the arm and shaft so you can get back together the same way it was.
remove the screws for the catch all box ot the bottom of door, remove the window switch and the two hex head screws that hold the door panel on under the switch. remove the screws under the arm rest and remove it. When that is done it just un snaps from door
Your heater core is located behind the dash. You need to remove the dashboard and your heater core will be located on the passenger side along the firewall. It will look like a small radiator. Get yourself a haynes manual for good step by step instructions and pictures to remove your dash.
Take the bolts out that attach the steering box to the frame and pivot the box so you can fit the puller on. Leave the steering shaft and power steering hoses attached. Mark the new pitman arm and old one in the same place and mark the pitman shaft to keep the same position of the new pit man arm on the old shaft as the old pitman arm.