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  #41  
Old 05-15-2013, 10:48 AM
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Who knows? The need for steering damping is directly related to scrub radius, so it would seem that should be independent of sag at least. Wear will always change the dynamics though, in the sense that less friction in the components means there is more force available for oscillation. If it was easy to design a truck suspension and steering not to need damping then you better believe all the manufacturers would do anything they could not to use them, but yet most trucks come with them from the factory. It could very well be that they put them on for belt-and-suspenders, so that the truck does not become a death trap when the ball joints and TREs are no longer factory fresh and the whole system is no longer exactly like it was engineered originally, when might not have been a need for the damper.
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  #42  
Old 05-15-2013, 11:58 AM
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Quote:
Originally Posted by OilHammer View Post
I plan to add one back in when I can figure out the correct length so that it IS dialed in. I have a 40 frame, 60 box, 70 axle, and hybrid link. Standard one won't work, I don't think.
Sounding similar to mine, minus the 70 series axles, but I did go with 70 series relay rod to complete the PS set-up.
I'd like to see what you come up with for an ideal stabilizer and mount, as I will probably look to that for a starting place on mine. Last time I looked it was going to be a challenge to fit a stabilizer to the frame mount and the PS TRE...
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  #43  
Old 05-15-2013, 12:24 PM
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I'd be looking hard for a cracked spring or shackle hanger worn bushing spring perch etc... The description is pretty much exactly like what my 80 did when the LCA hanger broke. I drove it for a month until it started leaking 90 wt and I noticed the damage.
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Last edited by Corbet; 05-15-2013 at 02:35 PM.
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  #44  
Old 05-15-2013, 07:18 PM
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Theory confirmed. Left side is 91.25" wheel base, Right side is .75" shorter. I also have a FULL 2" lean to the driver side. Wow.
I looked at the pins in the perches...they are both pushed forward, so the axle is "centered" on the leaves and not cocked sideways.

Looking at the perches, it's clear I should have narrowed them years ago. So, if the torch and welder are coming out, I'm going coils. I held up the 80 arms, and they look like they are perfect for what I'm thinking. I'm going to leave the leaf springs in the rear...basically troopie 70 style. So, I need some 80 parts. I need a front or rear panhard rod, The axle mounts for the arms, and the two frame side mounts for the arms. The rest I plan on fabbing, and I can fab those parts too if necessary, but prefer to start from something just to make it quicker.

No hurry either, this is going to take a while.
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  #45  
Old 05-15-2013, 08:18 PM
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I have OEM panhards in Durango as I just replaced mine with adjustable units. But I'm willing to bet you can find some locally. I still have my OEM coils too.
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  #46  
Old 05-16-2013, 07:31 AM
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Quote:
Originally Posted by OilHammer View Post
Theory confirmed. Left side is 91.25" wheel base, Right side is .75" shorter. I also have a FULL 2" lean to the driver side. Wow.
I looked at the pins in the perches...they are both pushed forward, so the axle is "centered" on the leaves and not cocked sideways.

Looking at the perches, it's clear I should have narrowed them years ago. So, if the torch and welder are coming out, I'm going coils. I held up the 80 arms, and they look like they are perfect for what I'm thinking. I'm going to leave the leaf springs in the rear...basically troopie 70 style. So, I need some 80 parts. I need a front or rear panhard rod, The axle mounts for the arms, and the two frame side mounts for the arms. The rest I plan on fabbing, and I can fab those parts too if necessary, but prefer to start from something just to make it quicker.

No hurry either, this is going to take a while.
This sounds fun!

Have you (or has anyone) considered TJ/JK coils etc. on a 40? Yeah I know it's J**P parts but similar in wheelbase and vehicle weight...
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  #47  
Old 05-16-2013, 02:12 PM
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The issue is mostly space. By going with the 2" coilovers, you are reducing the size of the coil and also the need for a whole extra tower for the shock. My plan with mods is always to be largely reversible, so the coilover tower can actually fit through the stock shock cutouts in the fenders. If I design it right, the tower on the driver side will incorporate the panhard mount as well. Been thinking this design out for 5 years. lol

Certainly cheaper to go used jeep stuff, but it also lacks the tunability. I will be able to change ride height pretty easily to compensate for lean, and if the spring wears out or I need more load capacity, the coil itself is about $70.
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  #48  
Old 05-17-2013, 09:25 AM
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I've got stock 80 front and rear panhards if you want them.
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  #49  
Old 05-17-2013, 10:02 AM
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Great! I figured Slee probably has a scrap bin full of that stuff too.
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1978 13BT-40, 70 series mechanicals
1966 FJ45 lwb stock
2003 100 OME lift
1974V8J40, 1992FJ80, 1985FJ60, 1971FJ55, 1978FJ40, 1974FJ40, 1997 LX450 all long gone.
KD0PZL
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