Options for raising clearance - Page 2 - Ram Promaster Forum
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post #11 of 39 Old 12-08-2016, 10:43 AM
RDinNHandAZ
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A couple of things. 1. That suspension has a SINGLE leaf where ours have a double, already lifting our vans’ rear about 3 inches. 2. I doubt hanging 500 lbs out 3 feet from the rear of our vans will make much difference, the stock suspension is built to carry about 4500 lbs. although I know it would normally be forward but really 500 lbs. is nothing.
This picture makes me more interested in removing the second leaf on my jacked up rear end on my 1500 to get it down, the reverse of what the OP wants!

2015 136" HT Diesel Sandstone Metallic Born on 6/12/2015 Campervan build see: http://www.promasterforum.com/forum/...ad.php?t=37177
Have Leatherman, Will Travel
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post #12 of 39 Old 12-08-2016, 10:44 AM Thread Starter
mikemarmar
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That's a good point Turf n Surf. Even just a lift on the front with bigger tires all around would be helpful.

MJAB, I think I will contact them. I like what they have done with the rear axle so it doesn't hang so low in the middle.
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post #13 of 39 Old 12-08-2016, 11:53 AM
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Quote:
Originally Posted by RDinNHandAZ View Post
A couple of things. 1. That suspension has a SINGLE leaf where ours have a double, already lifting our vans’ rear about 3 inches. 2. I doubt hanging 500 lbs out 3 feet from the rear of our vans will make much difference, the stock suspension is built to carry about 4500 lbs. although I know it would normally be forward but really 500 lbs. is nothing.
This picture makes me more interested in removing the second leaf on my jacked up rear end on my 1500 to get it down, the reverse of what the OP wants!
Lots of info here: http://www.promasterforum.com/forum/...ad.php?t=44057
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post #14 of 39 Old 12-08-2016, 06:52 PM
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Originally Posted by Turf n Surf View Post
I will have about 500lbs hanging 3ft behind the rear bumper. I will definitely have airbags to aid the rear suspension. Might also add stoppers to prevent the van from bottoming out IF it's feasible.

Dodge RAM Promaster 1500 2500 3500 Van 2014 2015 & 2016 BOSS Air Bag Kit LA66 for $400...
Adding 500 lbs 36 inches aft of back of van to a 136 WB van will add 780 lbs to the rear axle load and remove (lighten) front axle load by 280 lbs.

Gary
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post #15 of 39 Old 12-08-2016, 07:19 PM
jostalli
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Quote:
Originally Posted by mikemarmar View Post
I end up on some gnarly roads, especially in the southern UT desert. After bottoming out my 3500 twice (only minor damage ) I am looking at options for improving clearance. There is some interesting info in this thread http://www.promasterforum.com/forum/...ad.php?t=51066 on lift options, and it seems like using http://www.spaccer.com/ might be a good option for lifting by 2" or so. My questions are:
  1. Which options have people tried for adding a few inches of lift? Any issues/considerations?
  2. What is the largest tire diameter that people have been able to fit? With or without modifications to the wheel well?

Thanks!
1. Spaccer is the only available option to lift the front end. A user here has used the Spaccer's. For the rear the only available options are: add-a-leaf, airbags, or Sumo Springs. The heavy duty Sumo Springs add around 1".
2. I have 245's and they fit great with no rubbing.

I also spent time off road in Utah. No bottoming out even with my water tanks mounted underneath in the middle of the van.
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post #16 of 39 Old 12-08-2016, 07:39 PM
Turf n Surf
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Quote:
Originally Posted by GaryBIS View Post
Adding 500 lbs 36 inches aft of back of van to a 136 WB van will add 780 lbs to the rear axle load and remove (lighten) front axle load by 280 lbs.

Gary
HI Gary,

Let us pick your brain, what are the numbers for the 159 WB?

If I can't take it with me, then I am not interested...
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post #17 of 39 Old 12-08-2016, 08:21 PM
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Originally Posted by Turf n Surf View Post
HI Gary,

Let us pick your brain, what are the numbers for the 159 WB?
Not sure what the distance is from rear axle to back of van on the 159 WB -- if its the same 40 inches as the 136 WB, then adding 500 lbs 36 inches aft of the back of van would add 740 lbs to rear axle load, and decrease front axle load by 240 lbs.
Not a whole lot of difference.

The equation is

Rear axle increment = (159 + 40 +36)(500) / 159 = 740 lbs

That is, if you take moments about the front axle of the van, the clockwise moment of the added 500 lbs has to offset by a counter clockwise moment at the rear tires.

Gary
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post #18 of 39 Old 12-08-2016, 08:47 PM
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Originally Posted by MJAB View Post
This is how looks like the rear suspensions of the demo motorhome of Fiat Professional.



I have ideas of building or modifying a rear beam to gain more clearance in the middle. It wouldn't be hard just some balls to cut and modify the stock one. I really love what these guys do, awesome.
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post #19 of 39 Old 12-08-2016, 09:04 PM
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It's very easy to modify the front suspension to get an extra .75-1" lift. It takes about 30 min and is reversible. I also have 245/75 mud terrains on my van.
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post #20 of 39 Old 12-08-2016, 09:09 PM
Tyler Wick
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What is the 30min reversible trick to get 1" out of the front?

2014 159WB High Roof 3500 Diesel custom camper build
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