alright my dad turned to the dark side and boughta cummins well it rusted out the rear shackle and the 1 ton dually leaf is pressing into the bed how do i compress this thing back down to get the new shackle on ?... miss you ford dudes btw but ol bertha has been runnin strong!

 

jack the bed up the cummins is over rater stock there only realy good when u hop them up

 

its hopped up lol ...... but i dont wanna bust the bed mounts I was thinkin big cargo strap wrapped around the leaf and the axle to pull it down ?

 

so put the jack on frame and jack it up the way take the weight off it if the springs comprssed and u pull it wrong that traped force will be relised and want to go some where

 

honestly im freakin terrified to do this cause of all that force .. just wish there was a safe easy way

 

Gonna have to do the same thing I did when I changed my hanger. I had to use a floor jack and a big block of wood. Just jack up the frame and put a jackstand under there.

 

behind or in front of the axle boggs?

 

depends on where ur spring is broke. Mine was in the back, so i jacked where the hitch is bolted to the frame. Since you said it was a rear one, you probly need to jack behind the axle.

 

was the rear shackle behind the axle , just jacking up the frame will bring the spring down ?

 

yes do it slowly so the engry can slowy dispate

 

yes, Eventually you get the frame up high enough and the spring will stay in the same place. Then its just a matter of swapping out your shackle.

 

ok awesome that sounds good to me thanks dudes

 

yup no problem. Let us kno if it gives you any trouble.

 

Just think about, its really common sense.
If you jack up the frame, you're taking the weight off the springs, and off the axle. If you jack it up high enough, you'd be supporting the frame completely with the jack, and the axle will hang from the springs (tire off the ground). Without the weight of the truck, you will be able to move the spring much easier and safer.

A few notes.... Most likely, your jack isn't tall enough to jack the frame up high enough. Ways to cheat include taking the tires off and lowering the axle closer to the ground, build up underneath the jack with sturdy blocking, stick a block (or several, or one standing up) on top of the jack to take up the room. Be careful doing any of these things as they can be quite dangerous. Make sure the front axle is securely blocked, and have jack stands ready. Ideally, adjust the jack stands as you're raising the vehicle, so if something catastrophic happens, it can only fall an inch or two before stopping.

Actually, another thought I just had would be to jack from the axle as high as you think needed, then block the frame in place, and lower the axle down to take the weight off the spring. Due to the physics involved, you may have to jack up both sides to get the weight off evenly so things will line up again.

Lastly, don't torque the bolts down until its resting back on the tires. First, less chance you'll pull it off the jackstands cranking on it. Secondly, that way it won't tear or overstress the bushings. Tightening it first, then loading the spring will rotate the shackle and mess up the bushing.