Soft Rear End with Static Weight

Hello, All; I'm happy to be here as a first-time Toyota and Tundra owner. I have a new 24 TRD Pro Hybrid. After searching and reading other comments and posts about this issue, I still find myself a little perplexed and need to reach out to the group.

I added a Decked system with my camping gear (about 225lbs loaded now), and my Leitner rack with three loaded rotopax and two side boxes with gear (about 200-250lbs), and now the rear end sags about 1.5" to 1.75", so my goal here is to obtain some advice on how to correct.

I want to level the truck back out, and my TRD Pro already has the factory lift. After calling the dealership they advised me to look at aftermarket as Toyota doesn't have a stiffer spring kit. In my reading, it looks like springs and shocks will need to be replaced, but most of my reading wasn't on TRD Pro's, so I'm not sure how my truck should be upgraded, so any advice would be welcomed.

 

Welcome from West MO. Went camping over the week, had some good sag as well. Curious as well what others are recommending/using

 

I understand that the rear end is sagging, but what’s happening to the front end?
Has the front end risen at all?
If not, isn’t this how your truck is supposed to react when hauling a reasonably sized load?

 

@Mattedfred The front has also come up just slightly (not 1.5") but I had the same issues on my Raptor back in 2022 and was out west camping in Moab and made a B-Line to LA straight to Dever, where I spent the morning getting a new spring-pack installed because my rear approach/exit angle was so bad and they leveled the truck out nicely. My fear is adding in more gear in the bed and toys on top that it will sag even more as we camp/tow. so the goal was to get this firmed up and level when hauling around 1000lbs of camping fridge, goal zero battery bank, luggage etc..

 

Stiffer rear springs

 

It's normal but you can control it if don't like the sag. There are more in depth threads on this but you could check out dobinsons springs they offer different rate springs. This should bring you back to ride height while you are loaded. Once you unload you will have a lot of rake. There is no simple answer since use case varies across owners so only you can decide whats best for your setup. Also our stock springs are dual rate which is why you see so much compression try to stick to stock numbers and if you are stuck read thru the threads relating to 3rd gen suspension lift or just call dobinsons they are pretty smart and will guide you in the right direction.

 

Echoing what others have said, call Dobinson or an off-road shop and advise them of your use case and typical static load so they can recommend springs with the correct spring rate to manage your cargo.

 

Thanks @mayan & @terraj66 the dealership said the same but could not work with me on that. The biggest question so far was since i have the TRD PRo already with a 3" lift kit from factory is there any options for me without compromising the factory stuff. Meaning if I replace springs do I also have to replace shocks ect.. And the forum searches I have done already don't really address TRD PRo's and even some of the sites I have gone too or most really, have exceptions in their kit (not for TRD PRO) so it's been a bit confusing really.

 

You wouldn't necessarily have to upgrade shocks since TRD Pro shocks are adequate for most use cases but if your rear end is too bouncy you might want to upgrade to something adjustable. Again dobinsons lol they let you control high speed comp, low speed comp, and rebound. Since you are carrying more mass you need to control it with bigger shocks or better valving/ adjusting shim stack. I would slow down the front rebound and speed up the back till you find a happy spot. If you are gonna go long travel extend the brake lines it's simple and cheap.

 

I called them, and they recommended https://dobinsonusa.com/products/dobinsons-rear-coils-springs-c59-845v-c59-845vr/, which I have ordered as I have between 400-450 of static weight with the rack, decked, system I and I all I the gear I in I there I. I appreciate the recommendation. Now, I need to find a reliable shop in my area (Metro Detroit) that installs springs. Even though it's a fairly painless process, if shops are recommended in the Tri-State area (Michigan, Ohio, Ill), I'm all ears since the Dealership will not install aftermarket parts.

 

I added Airlift Air bags to my SR5 TRD Off Road. The weight of my fiberglass cap made the rear sag a bit. Pathetic. Really pathetic with a trailer. The Airbags cured it. Definitely notice a stiffer ride. More truck like.......