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Old 11-25-2013, 12:12 PM   #11
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If you raise the rear by 4 inches you should also raise the front. Problem is I don't think you will be able to align the front end even if you only raised it 2-3 inches. I expect you could not get the camber right on the twin I beam suspension. Also raising the chassis 4 inches will negatively impact the handling quite a bit with sway and lean on such a high and heavy vehicle. Not that it would be undriveable but would be more like a dump truck rather than pickup truck like now.
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Old 11-25-2013, 12:18 PM   #12
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I used to work at a suspension shop. Adding 4 springs to that setup isn't going to raise it 4 inches. You would have to go to a shop that can add arch to the springs and it won't last. Most 4 inch lifts require using blocks. I myself wouldn't recommend it. Your not going to get 4 inches out of the front. As mentioned, your not going to like the way it drives plus your rearend will have absolutely no give to it at all. If you think pot holes sound bad now, it will be 10 times worse with 4 more leafs. The best I think you could shoot for is maybe 2 inches max and if you have clearance maybe a taller tire for another 1/2 to 3/4 inch. But the taller tire could affect your capable loads.
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Old 11-25-2013, 02:00 PM   #13
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Thanks 4 all participants in this issue so I have no more choices in this subject I all ready removed the jacks to enjoy my rving time without worries. But I'll try to give my self the last shot and fix the jacks again just for demonstration and do a drive test if it touch again the speed bomb then no jacks at all.
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Old 11-28-2013, 06:53 AM   #14
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Hello I came back after customized my Bigfoot height with in increasing of 4 inches on back pillars and 3 inches on front pillars. I did it by removing the pillars holder to the frame and re weld it 4 inches and 3 inches down on the hydraulic pillars and that solved my problems.
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Old 11-28-2013, 07:11 AM   #15
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Glad to here you solved your problem. What year is your 3170 i ask because on my 2011 there is only enough room to raise them an inch or so before the top of the cylinder hits the bottom of the coach
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Old 11-28-2013, 07:22 AM   #16
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Mine is 2014 sunseeker 3170ds built on ford chassis.
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Old 12-01-2013, 10:36 PM   #17
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Love to see pictures.
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Old 12-02-2013, 04:43 AM   #18
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Here is some pictures.
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Old 12-02-2013, 09:31 AM   #19
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Looks good. Have you tried them yet?

My experience is that the FR factory installed jacks are stroke limited (short) and reach their limits when the campsite is only a couple inches off level. Especially in the front. Raising the jacks reduces the effective stroke for leveling and being extended further reduces the stabilizing capability like adding longer legs to a wobbly table.

However if you have to frequent areas that the jacks drag you have no choice to what you did other than spending a lot to convert to a folding leg type jack.

At the suggestion of a Big Foot engineer I added 1.5" plywood pads to the front jacks to increase effective stroke but it reduces the clearance from about 7" to 5.5".
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