86' square getting bagged

Double check your pitman and idler.

Could be tire trying to seperate on ya. Also check your air pressure.

Yeah worn idler arm tends to display itself around 30mph or so; tire balance issues around 50-60mph so I'm with GenX, check the tires. If it's just a simple out of balance issue it won't tend to be that dramatic of a problem. One might be coming apart internally and could still look pretty much fine. Could also be a bent wheel. Jack it up and turn them by hand slowly, look for uneven areas, including inside sidewall. Try swapping fronts to rears if you're running same size on all 6. If that cures it move them back up front one at a time until you find the bad one and TRASH IT...

Of course any badly worn suspension components can get set out of whack easily by even a minor tire balance issue, so go over the whole front end and be sure everything is reasonably tight. Have someone sit inside and crank the wheel from side to side slowly with the engine off, while you watch the idler, pitman, tie rods, etc. Jack it up and put the frame on stands, then use a long pipe under each tire as a lever to lift up while someone else watches the ball joints to see if they have slack.

Richard

guys thanks for the help i really appreciate that ill have to check that stuff out this weekend. i should go through and probably check all the front end components and it might be a tire issue. because i didnt have this problem at all then i got used tires for the front so thats probably the culprit but checking everything wouldnt hurt

well i tried 2 different sets of new tires and still have the problem. I grabbed onto the tierod adjusting sleeve and twisted it with my hand and it was really loose on both sides so im going to replace inner and outer tierods tomorrow and see if that fixes it do you think that could cause the shaking around 55 because everyone i asked said its probably a tire issue.

I did buy some new parts though. just updating i got a new drivers side headlight ring, new windsheild chrome and new roof light seals hopefully that will stop my leaky roof. I also changed out all my u joints which were bad so i havent really done anything but maintenance work on this truck but it needs it.

ok i got all new inner and outer tie rods and installed them today the other ones were a little worn but not bad i also borrow a set of new 16inch rims that had brand new tires on them and still have all the same issue any ideas my pitman and idler seem fine, does anyone think a bad ball joint could cause that

Check back to my last reply, it's pretty easy to test the ball joints.

Richard

Did you get it figured out?

wow its been a while since i got on here and updated but i actually havent done anything to the truck. i got a 79 2wd blazer ive been spending my time on and i bought a new daily an 09 ford 3/4 ton so thats where all my money is going. I have decided since im going to get new ball joints all around im going to shorten my lower arms i dont know what the magic number is but i think im going to do 1 inch just out of the lowers and put it together i might end up shortening my uppers too but not sure yet. hopefully this will solve all my issues. then i need to wait until its warm out and finish welding up my rear tubs. its just been sitting with 1 wheel tub done and an open floor k ind of half assed but i have an excuse im lazy

another question has anyone modded the blower on these trucks to keep the ac i know most of you are body dropped so theres no way if you are unless you switch to an underdash system which i dont want to do because im to cheap. i have my blower part cut off my ac and i think i have it figured out how i want to do it but i dont have a brake to bend the metal to do it. just looking to see some pics if anyone has done it