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I am thinking about building some custom shock hoops for my 74 F-250 and wanted to figure out what size of shocks I would need to use with a dual shock setup. I realize this completely depends upon the design of the shock hoop and where the shock mounts are located. However, once I have figured out the design of the hoops and where they will be located how do I go about determining the length of shock to use? I can measure the distance between the upper and lower mounts but depending on how much articulatation the front axle goes through is the current problem as I have no idea how to take this into account. I will be installing 4" skyjacker springs in the front and rear with a dana 60 upfront. I plan on using skyjacker platinum series shocks. Any help would be greatly appreciated.
I can measure the distance between the upper and lower mounts but depending on how much articulatation the front axle goes through is the current problem as I have no idea how to take this into account.
That's just it, you won't know until you test the articulation. What you need to do is wait until the new springs are on and then ramp up the front end as much as possible (one tire up). Measure the distance while it's ramped on each side and then you'll have a max extended and compressed measurement. Once you have that you'll be able to decide which shock you need. Otherwise there's no way of knowing and you might bottom out a shock or you might pull one apart. The other option, which isn't the best but it will work, is to look at their shock specs and find the one with the longest travel. Get the shock and extend it halfway and then build your hoops off of that. However once you add the 4" lift it will change everything once again.
Yeah get a shock thats longer than what you will need so then you don't "accidently" toast a shock by using it as a limiting strap. I myself am getting a set of 15" travel pro comp shocks (esx9000 for when i do my lift), then i will move the shock mounts accordingly to get the most down travel out of the shock as i can, which means i will probably have to move the front mounts up a few inches, and the rear should be ok as it sits.
What do you mean by attaining the most down travel? Also, what is the best direction to mount a shock i.e. chrome shaft facing down or chrome shaft facing up. The Skyjacker Platinum shocks can be mounted either way. And yet another question, are limiting straps needed for this type of application. I will be offroading quite a bit and if the straps are a good idea I might as well just use them as they are not that expensive. Thanks for the help guys.
Well with only 4" of lift i wouldn't worry about limiting straps, as generally the springs droop won't be enough to bottom the shocks out as long as the shocks are of the proper lenght, and for that i would do what ivan suggested.
As for which way to mount the shocks, its best to mount the shocks with the chrome shaft pointing up, as this way you won't bend it on a rock or something.
What i mean by down travel, is that its pointless to have a bunch of shock travel left when the axle is on the bumpstops, so its better to put the extra travel where it can be used, like when articulating.