720inOlyWa Posted August 29, 2017 Report Share Posted August 29, 2017 I notice- on both of my 720s, that when I turn sharply to get out of y driveway, the suspension makes a ‘Yich!‘ sound, like the shock is being stretched in a weird way. Old shocks? Ball joints are dry? Any ideas? It only happens when I turn sharply and the front of the truck meets a small bump, like the transition from driveway to street. 2 Quote Link to comment
bottomwatcher Posted August 30, 2017 Report Share Posted August 30, 2017 Try greasing the steering stop. 1 Quote Link to comment
datzenmike Posted August 30, 2017 Report Share Posted August 30, 2017 Climb up on the bumper and try to bounce the truck. If it 'squeaks' have someone try to locate it. Grease the ball joints and see... can't hurt if not. Sway bar rubber isolators? Tension rod rubber bushings? Upper control arm bushings? Spray liberally with WD-40. Won't cure this but might point out where the sound originates. 3 Quote Link to comment
420n620 Posted August 30, 2017 Report Share Posted August 30, 2017 I don't have a 720 but assume it's close to the 620 front suspension, not sure what to call it but theirs a small square bolt on the back side of the backing plate towards the front, by the outer tie rod/s. When you crank your wheels to far in either directions, this square bolt head ( which might/ is adjustable ) rubs up against the lower control arm " wuts you ma call it bracket " on the lower control arm and makes a hell of a screeching sound. It's not required to grease the square head bolt but a little can't hurt. GL 1 Quote Link to comment
Charlie69 Posted August 30, 2017 Report Share Posted August 30, 2017 My 86 did this until I replaced the ball joints. Quote Link to comment
KELMO Posted August 30, 2017 Report Share Posted August 30, 2017 The whatchamacallit that 420n620 posted about.....seems to me there was a plastic part that went over the top of that thing. It is like a stopper for the steering system. If I can get to my catalog later I will see what I can find. 1 Quote Link to comment
Roadster-ka Posted August 30, 2017 Report Share Posted August 30, 2017 STEERING STOPS!!!! 1 Quote Link to comment
720inOlyWa Posted August 30, 2017 Author Report Share Posted August 30, 2017 STEERING STOPS!!!! I wonder what you mean.... 1 Quote Link to comment
Roadster-ka Posted August 30, 2017 Report Share Posted August 30, 2017 What 420n620 said. Put heavy grease on bolt heads of steering stops. 1 Quote Link to comment
G-Duax Posted August 30, 2017 Report Share Posted August 30, 2017 Don't turn quite so tight :) 3 Quote Link to comment
Stoffregen Motorsports Posted August 30, 2017 Report Share Posted August 30, 2017 Sometimes when balljoint suspensions are cranked to full-lock, they climb a bit. Meaning that the geometry at full-lock is so whacked that turning full-lock actually binds the balljoint and makes the suspension move. Hard to describe. But try greasing the balljoints and crank away. If you still hear the noise, it could be something else, or the balljoints could already be damaged beyond use. 1 Quote Link to comment
KELMO Posted August 30, 2017 Report Share Posted August 30, 2017 part # for the cap that goes on the "STEERING STOPS!!!" bolt (or the watchamacallit) is 40039-N8200. If it is still available from Nissan I can neither confirm nor deny...you would have to call. This is a plastic cap that prevents metal to metal contact. Curious part about this.....I could only find it in 4WD section. 2 Quote Link to comment
datzenmike Posted August 31, 2017 Report Share Posted August 31, 2017 '78 and '79 disc brake 620 and 720 2wd trucks had the same stopper bolt. All 720 4wd had stopper bolts but were different than the 2wd and different through the years on the 4x4 Only the '80 720 4wd had the stopper bolt caps.40039-N8200 1 Quote Link to comment
720inOlyWa Posted September 1, 2017 Author Report Share Posted September 1, 2017 Okay, well, problem solved- or at least diagnosed! I did everything but get dragged under the truck on my creeper to figure out ‘the Yich‘. The tip off came when I was backing out of my driveway and heard it again- only this time coming from the back end! I am pretty sure that old shocks are the culprit. They must get racked a little when turning sharply at slow speeds and this makes them complain. Pretty sure that‘s what I was hearing. 1 Quote Link to comment
7twentyguy Posted September 1, 2017 Report Share Posted September 1, 2017 I just changed out all of the leaf spring bushings on my 85 KC, I had a groaning sound turning into my parking lot at work. After the new bushings, no more noise! 2 Quote Link to comment
datzenmike Posted September 2, 2017 Report Share Posted September 2, 2017 Chaffing leaf springs? 1 Quote Link to comment
7twentyguy Posted September 2, 2017 Report Share Posted September 2, 2017 Yeah, sprinkled talcum powder on them, much better now Quote Link to comment
giantcone Posted September 7, 2017 Report Share Posted September 7, 2017 Hmm, my truck "Yitches" under the same slow speed tight turning over bumps as well. I thought spray graphite on the leaf springs would solve the issue. I'll look into replacing the leaf spring bushings on my '85 KC as well. Quote Link to comment
distributorguy Posted September 7, 2017 Report Share Posted September 7, 2017 Sometimes when balljoint suspensions are cranked to full-lock, they climb a bit. Meaning that the geometry at full-lock is so whacked that turning full-lock actually binds the balljoint and makes the suspension move. Hard to describe. But try greasing the balljoints and crank away. If you still hear the noise, it could be something else, or the balljoints could already be damaged beyond use. Its like how a U-joint binds when you go too far with the angle. Maybe adjust the steering stops out a little to limit travel? Quote Link to comment
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