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Old 08-04-2016, 07:52 PM   #1
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Leaf spring assist for more payload capacity?

I searched for an answer to my question in this forum, but couldn't find the answer so perhaps someone can help me out.

We have a 2004 Nissan Titan and just purchased a Flight SLX 267. Based on my estimate we'll be within the available payload, but not by all that much.

During a trip to the auto parts store last week I noticed a product described as a leaf spring assist set. It looked like a bolt-on product and supposedly it can increase your payload capacity. Is this a legitimate way to build in some safety factor? Is there a better way?

I don't have any experience with towing a trailer this size so I'd appreciate some input. I'm going to follow the advice I've read here and use a scale to get more precise weight data. In the meantime, I'd like to learn more about my options.

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Old 08-04-2016, 07:58 PM   #2
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No add on device will increase payload. I installed the Roadmaster Active Suspension to my truck and it helped quite a bit with the ride as well as the sag under a load. Payload can not be increased.

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Old 08-04-2016, 08:09 PM   #3
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No you can not increase payload capacity in any way by adding anything. All add on stuff does is help with the ride and squat

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Old 08-04-2016, 08:13 PM   #4
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I think you need to better define what you mean by "payload" increase.

You can research your local jurisdictions registration requirements and figure out how to register your Titan for a higher GVWR and make it LEGAL to increase your payload.

There are ways that you can increase your trucks ability to handle higher weights. You just need to determine what the limiting factor is and replace that. Maybe the springs are the limiting factor, maybe the brakes, maybe the tires, maybe the lugs, maybe the frame. That will make it SAFE to increase your payload.

But there is no way to add anything to your vehicle to increase the manufacturers posted payload sticker, the sticker by which the manufacture warrantee's their parts.
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Old 08-04-2016, 08:31 PM   #5
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Thank you for confirming what I thought was the case.

I don't have the exact numbers handy, but there is about 1600 lbs between the curb weight and GVWR for the old Titan. Between my passengers, two huge dogs, topper, hitch and the TT tongue weight I'm using up about 1400 lbs. I was assuming that the rear suspension was the limiting factor. The truck has all new brakes and it should have enough motor as well.

I appreciate the quick responses.
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Old 08-04-2016, 11:29 PM   #6
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The critical component is the axles.
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Old 08-05-2016, 03:53 AM   #7
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Light duty trucks that are not for hire don't have pay loads. There are add ons that will improve the handling and safety of any truck. I do not know of the kit you mentioned here but if your truck is sitting on the bump stops then you have zero rear suspension travel and that is a safety issue that can be improved with new springs, air bags or Timbren springs.
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Old 08-05-2016, 09:14 AM   #8
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I have the Timbrens on my Ford F250, they helped with rear end sag. Here are some pics of OEM bump stops and new Timbrens
Attached Thumbnails
timbren3.jpg   timbren4.jpg   timbren1.jpg  

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Old 08-05-2016, 09:32 AM   #9
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not to high-jack the thread, I was looking into this as well. I have access to a rear suspension from a 2016 3500 CC and I have a 2016 2500 CC, if I add that rear leaf pack to my 2500, will that increase may payload?
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Old 08-05-2016, 09:54 AM   #10
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Payload capacity also takes into consideration frame size and strength, and most importantly brakes. Your 2500 front brakes may be smaller, and less effective than a 3500's, and by the sounds of it you're only changing the rears. just something to consider.

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