Will 2500 rear springs fit on a 1500?

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by bigbluesub, Jul 13, 2012.

  1. bigbluesub

    bigbluesub Rockstar

    Just wondering if the rear leaf springs from a 2500 or even a 3500 will fit on my 2002 Silverado 1500 LS extra cab 4x4. I am picking up a 27' trailer this weekend and I am already anticipating my trucks weaknesses.......thanks...
  2. Salesguy1980

    Salesguy1980 Rockstar 100 Posts

    Do you have 2500 springs ready to go? May be a lot easier to add a leaf spring or install airbags to help with the weight. What kind of 27' trailer? If a camper add your gear and weigh directly over the trailers axel or slightly behind to help reduce the tongue weight, that should help as well

    Not sure if 2500 springs will fit, best thing to do is measure your and the ones you want to install
  3. paracutin

    paracutin Rockstar 100 Posts

    Springs are only part of the equation. The entire rear end in the 2500/3500 is much heavier built to handle the additional weight. Not to mention possible differences in the frame. You can't make a 1500 into a 2500/3500 by just swapping springs.
  4. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    This times two.
  5. ChevyBoy2009

    ChevyBoy2009 Rockstar 4 Years 500 Posts

    This X3!!!
  6. Kapelusprime

    Kapelusprime Member

    A load distribution bar kit would be my first step before swapping leaf springs. Reese, www.reeseprod.com has many applications. If you have an RV dealer near by they usually carry them. The money you'll spend doing the swap, you cant get the load leveling you need without making your 1500 drive like a tank. My 1500 pulls my 20 foot 3000 lbs trailer with a tongue weight of 280 lbs without breaking a sweat or squatting.
    My best friend and fellow camper/trailer owner pulls his 25 ft 4600 lbs trailer with a 1500 with much the same ease. He did invest in an all in one anti sway and leveling kit, very necessary for maintaining control at highway speeds. Especially when it gets windy things can get interesting when a tractor trailer passes him.
    You did post the length of your new trailer but not the weight of the trailer or tongue weight. The average 27 ft being in the 5 to 6 thousand pound neighborhood with a 550 lbs tongue weight shouldn't be too imposing on your truck. I would defiantly look at a load leveling kit before putting in an add a leaf. I did have airbags from "Airide" on my last truck and being able to air up when I loaded the bed and air down when empty was cool and useful.
    Last edited: Jul 14, 2012
  7. Skippy

    Skippy Member 2 Years 100 Posts

    I'm assuming the leaf springs are pretty much just to keep some play in the shocks, as they're not going to actually increase the load capacity. The same amount of weight will be on your axle either way. The 1500 doesn't have a full floating axle like the 2500 does. FF axles place the load on the wheels, rather than on the axle, as you'll find in the 1500. This means regardless of the springs you add, airbags you use, or other anti-sag devices, you're axle strength is likely to be a significant limiter. As other folks have mentioned airbags can also be used to reduce sag. You might also try timbren's suspension enhancement system (a WHOLE lot easier to install than helper springs, and they typically don't affect unloaded ride quality. A quick search will reveal though, that they have fans and "non-fans" as with air bags, or springs. I mention them only to give you options.). The timbrens will bolt on in place of your bump stops over the axle, and help reduce sag.

    I would recommend though, before you massively upgrade the rear of your truck, as long as you're within spec of your towing capacity, you should seriously consider installing a weight distribution hitch. Those will do far more for your towing than simply raising the back end of your truck. Weight distribution systems will basically lift the point of connection putting more weight on the front axle and level out your rig with your trailer. The result is a far better ride, more traction control (as the weight is more evenly distributed across your rig's axles), and better rear end clearance (it'll lift your rig back up a couple inches.)

    In-line sway control cams are also an amazing choice. They really do help with the load control.
  8. nabisco_12

    nabisco_12 Member

    ok i was wondering the same thing, i doubt i will pull a 20 foot trailer but a car trailer for sure, when we loaded my old 3/4 ton on there my truck almost bottomed out, keeping the clowns load it front forward. but i guess some bags would be the way to go? i want to help the sag but if i want more strength then i need a axle? is changing the rear end really the way to go in my case? would i have to do something with the front since i have a 4x4? what cost could be expected or what leafs should i look at i will research the timbren's suspension enhancement system more later i wanted to post first long day at work ugh...
  9. moogvo

    moogvo Epic Member 5+ Years 1000 Posts

    I know this thread is old but I foound it by using a google search, so people who are thinking about doing this swap are still finding it. I thought I would add my experience in so that the next reader might make an informed decision.

    First, the only way to make a 1/2 ton into a 3/4 ton is to jack the body up and roll a 3/4 ton chassis under it. Great if you have a nice 1/2 ton and a 3/4 ton that needs a body. Swapping 3/4 ton springs into your 1/2 ton does nothing to increase load/towing capacity. What it DOES do is to allow you to tow at the upper limit of your rated towing capacity without squatting the rear end down to the ground.

    3/4 ton trucks are more than just springs and more lug nuts. They have bigger brakes (because at some point you are going to want to stop that load!), taller and more sturdy frames, heavier axles bigger engines and transmissions... (Some 3/4 ton trucks come with v6 engines and 4L60E trannys... Not too sure why but they do...)

    Anyway... I swapped my 1/2 ton rear leaf springs from a set of 3/4 ton springs I got from the yard. It is a direct bolt in with no modifications of any kind. You will need longer U Bolts and the mounting bolt at the front of the drivers side requires you to either drop the fuel tank or cut the bolt off and pound it out.

    After the swap, the truck actually rides better than it did before. It lifted the rear of the truck a couple of inches. I am probably going to have to get a leveling kit to pick the nose up a little. Here is a shot of my 1/2 ton with 3/4 ton rear springs:

    thegawd and RayVoy like this.
  10. Viper

    Viper Rockstar 100 Posts

    I don't like digging up older threads but, here it goes anyways.

    I have a 2003 GMC sierra 1500 with approx. 240,000km on it, and well the springs are shot to say the least. I want to upgrade them with 2500 leaf springs and I've read that they will fit without any modification but is it best to get ones that match the same year of truck ie mine is a 2003 so I should try and get 2003 2500 series leafs. Also when I looked on rockauto they have different listings 1500 lbs capacity, 2500 lbs capacity and 2235 lbs capacity, I'm not expecting the truck to be anymore than a 1500 as mentioned above there's a lot more to a 2500/3500 than leaf springs. I do however want to make sure I get something useful, I will also be updating the shocks, and shortly after replacing the front suspension as well.

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