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I envy thee not. My best advice is to try to find a Chilton/Haynes manual for your truck. The one I have form S15 is written very well as to replacing seals, bearings, etc in the drive train/suspension. Or if you're really god friends with a shop owner, they may have the manual on CD ROM. Personally I think the CD ROMs are stupid. Little hard to have your laptop or PC at your elbow while turning wrench.
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If the problem is a leak between the pitman shaft and the steering gear box, you can replacement pitman shaft seals from RockAuto Parts Catalog If the arm is bent or worn, ask Rock Auto if they have one. Otherwise, your alternatives are a dealer that's been selling Chevrolet since 1989 or longer (there might be one on the shelf) or a junkyard. I don't do that much front end work, but I haven't heard of pitman arms going bad for a long time. They may be special order items only from the dealers rather than stocked spares..
remove the pitman arm from the steering gear look in the big hole that goes on the steering gear shaft, there are two sizes to the groves on the pitman arm, count the number of the wide groves these wide groves are the splines you need to count, you will have 3 or 4 gaps in the spline pattern this is your answer.
best of luck to you.
check to see if the leak is at the shaft that the pitman shaft attaches to. if it is the pitman shaft seal will need replacing. if its leaking out the input shaft, the part that attaches to the steering column, then this seal will have to be replaced. check the power steering hoses closely for cuts and leaks. you may have to wash the area to remove the oil to find the leak.
are wheels free to move ? could be just stubborn , Is the seal holding it in ? lockring ? a repair manual would be helpful , todays vehicles have many surprises, I have one for all (4) of my vehicles, what gear is truck in ? should be neutral , yes ? you have jacks under frontend, yes. good luck
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.
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.
Silverados do not have rack and pinion steering. The steering box is bolted to the frame on the drivers side, that can be removed by removing the bolts holding it on, the steering shaft bolts, and the pitman arm.
take big nut off that holds pitman arm to it ,use pitman arm puller to pull off pitman arm. I would get a rebuilt unit ,my luck is that the shaft is so foofed that the new seal wont seal it either. also that shaft that connects to the pitman arm probably moves side toside, so the bushings inside are shot. remember this thing is OLD
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