Rear bounces off bumps Bilstein 5160's

So I haven't been able to find much feedback on this.


I have 6112's and 5160's, besides the 5160's the rear is stock and if it matters I also have Wildpeak 265/75/16 E ratings running 35psi all around.

Now the 6112's are phenomenal eating bumps like nothing but once the rear hits a bump it bounces or "bucks". I'm wondering if I could eventually fix the issue by adding an AAL, Bump stops or lowering tire pressure a little or maybe will resolves once I eventually add weight to the rear ?

Any feedback helps!

 

If you’re talking about off-road, your tire PSI should be 18.

 

AAL would help or spring packs. Toyota stock springs aren't all that great. Your Shocks won't do anything!

 

Stock leaf springs need to go

 

Trucks tend to do this when empty.

 

I have the same setup but replaced the rear leafs with General Springs HD leaf springs and haven't had any issues. The stock leaf springs were sacked.

 

Slow down when off-roading.

 

Well looks like everyone agrees with the stock leaf springs being shit and so I'll upgrade the leaf packs next! Thanks boyo's I've only had my truck a couple months and just like everyone here there's so much I wanna do to it and slowly but surely building her!

I should've clarified but I mainly noticed the rear bouncing real bad when I hit speed bumps not when off roading lol sorry

 

I don't think bump stops or AAL is going to help what you're describing when the truck is empty. Some weight will probably smooth it out.. that's easy enough to experiment with. From my understanding most of the replacement leaf packs help with loads and/or lift but not necessarily car-like handling when empty (and would be interested to hear from those that have replaced the leaf pack that aren't loaded down with armor and heavy bumpers.)

 

Make sure you don't get short AAL's. It will eventually make your rear springs into a "W". I'd recommend Icon 3 leaf AALs.

 

I've had a similar understanding with leaf packs as well that's why I didn't necessarily think they'd change ride quality too I thought the shocks would've improved the rear ride quality as much as the front coilovers have. I'm not looking for a smooth car ride quality just the rear suspension to ride as good as the front suspension

 

What are you running on your rear?

 

Stiffer springs (AAL or heavier packs) should reduce bottoming out but will make an under-damped suspension setup worse in that regard.

If you're bouncing too much on the springs, adding some weight in the back could help smooth out the ride if it's bouncing on the springs when it's not bottomed out. Tools and recovery gear can be good for that, but strap them down if you're going to drive like you're running the Baja 500.

More progressive bump stops (timbrens or air-bumps if you've got the $$$) should make bottoming smoother.

There don't seem to be as many options for suspension tuning on trucks as there are for sports cars, but it's probably also less sensitive for off-road than trying to get the "road-feel" dialed in for track runs. If all else fails, air down and slow down, and know that "handling" can get to be a relative term when it comes to rough-terrain driving.

 

The short AAL; that's why I know it will make your rear leafs into a "W".
I have the Icon 3 leaf pack sitting in my garage. I need to find time to swap them out. Got the Icons from 4WP for $210.

 

I've been down this same road... A new leaf pack probably won't do much for the bouncing you are describing. I thought it would when I swapped in my medium duty Dakars, but it really only helped with rough terrain like washboard or hardpack snow/ice. Sharp fast bumps like speed bumps and cracks in the road are still a problem even with about 200lbs in the box at all time.

The problem is the rear leaf mounts. They are flimsy and like to flex under load. They are also cantilevered off the c-channel frame instead of right under it. So when you hit fast bumps like that, the mounts flex and the frame twists and basically acts like a spring. But with no shock to dampen the bouncing. The solution is to replace the rear leaf mounts with beefier ones. Look into Archive Garage Hammer Hangers. I specifically mentioned having this same problem as you in another thread and Archive responded saying that's exactly what the hammer hangers were made for. I haven't put them on my truck yet but they are definitely next on the list. Lots of other members report that they helped with the bounciness of the rear end.

 

That's crazy you were curious of the same issue. I just stalked your profile and saw the thread that informed you about the hangers lol for one way to go with those Elka's can't imagine how nice they ride but also appreciate the info I think I ran across those hangers once but didn't realize the huge impact they'd make. They're definitely pricey but are now on my long list of mods to add

 

Haha yeah, the Elka's are awesome! Just floats over everything... Except for fast sharp bumps lol, which is what started my quest to figure out why. I have dual speed compression adjustment on the shocks. Yet when I adjust the high speed compression I find it really doesn't make much difference with bumps like that (which it should), only larger hits like train tracks and drop offs it seems to make a difference for. Now I know why. The frame and leaf mounts are "handling" those bumps so they aren't even really reaching the shocks. Kinda wish I would have started with hangers now!

 

Yassssss literally I mean I know I'm only rocking Bilstein's but the 6112's react so well when I hit any type of bump on or off road and I was disappointed when I discovered the 5160's made no real difference once the back end went over. So thank you for the great info, we're definitely in the same boat and will be looking into adding the hangers in the near future. I'm glad I at least know what will fix it.

 

The 5160s are pretty stiff on both ends. They dont let the rear end soak up, and they also dont rebound fast enough to keep the tires planted after hitting a bump, so you get the "jump" effect, especially with speedbumps.