1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

19 FOX TRD PRO shocks and coilovers

Discussion in '2.5 Gen Tundra Parts Marketplace (2014-2021)' started by 94slowbra, Nov 25, 2020.

Thread Status:
Not open for further replies.
  1. Nov 26, 2020 at 3:20 PM
    #31
    94slowbra

    94slowbra [OP] New Member

    Joined:
    Oct 30, 2017
    Member:
    #10617
    Messages:
    533
    Gender:
    Male
    First Name:
    john
    new orleans
    Vehicle:
    2016 TRD pro
    Pending local pick up tomorrow.
    Thanks
     
    RainMan_PNW and JLS in WA like this.
  2. Nov 26, 2020 at 4:02 PM
    #32
    Terndrerrr

    Terndrerrr guzzling dealer repellent

    Joined:
    Jul 8, 2019
    Member:
    #32965
    Messages:
    4,911
    Gender:
    Male
    Music City
    Vehicle:
    Dual 5.7s
    TRD Fox, RAS, 285/75 DTs, dual battery, SS3 Pro
    You know, I would’ve argued the same thing before installing this set. But the more I think about it, I think what you’re saying is only true if you’re installing shocks that settle to the same compressed length under the same load as the ones you took off.

    I’m not sure why, after looking at the two shocks side by side, anyone would assume that about these. Driving around for almost a week hasn’t caused front or rear to settle at all.

    Maybe they will settle in time, but the TRD Fox set is so much bigger I am not expecting my truck to settle at all without adding significant weight (like a load in the bed or a rack/tent or bumpers, etc)
     
  3. Nov 26, 2020 at 4:43 PM
    #33
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    Shocks don't hold your truck up. The length of them makes no difference. You could pull those shocks out and drive without them, you'll be at the same height.
     
    Newm, Wynnded, stuckinohio and 2 others like this.
  4. Nov 26, 2020 at 5:32 PM
    #34
    Terndrerrr

    Terndrerrr guzzling dealer repellent

    Joined:
    Jul 8, 2019
    Member:
    #32965
    Messages:
    4,911
    Gender:
    Male
    Music City
    Vehicle:
    Dual 5.7s
    TRD Fox, RAS, 285/75 DTs, dual battery, SS3 Pro
    I’m at 24.5” center of hub to fender on both sides (just barely higher on the passenger side). I was a hair less than 23.75” before. I’ll grant you that it’s less than I thought. But it’s still higher.

    I took the Bilsteins off without removing tires or jacking the truck up at all. In order to install the TRD Fox, I had to put my jack under the frame and raise it to droop the leafs enough to get the lower bolt in. That difference, along with the force that each shock is exerting against the axle and the frame isn’t completely negligible.

    Hence my slight rear lift after changing ONLY my rear shocks. I’ve been driving 20-30 miles daily for a week since the install.
     
    Last edited: Nov 26, 2020
  5. Nov 26, 2020 at 5:42 PM
    #35
    Bronzeback

    Bronzeback New Member

    Joined:
    Feb 27, 2020
    Member:
    #43215
    Messages:
    222
    This is not true
     
    Wynnded, Darkness and stuckinohio like this.
  6. Nov 26, 2020 at 5:58 PM
    #36
    stuckinohio

    stuckinohio MGM Crue

    Joined:
    Sep 3, 2018
    Member:
    #18972
    Messages:
    309
    Gender:
    Male
    First Name:
    Mark
    oHIo
    Vehicle:
    2018 SR5 Crewmax
    Longer shocks do not "add" lift.
    Longer shocks can allow more axle droop at full extension by either increasing travel, or by shifting travel range so the shocks don't top out at full droop.
    Leaf springs bear the weight of the truck not the shocks.
    While the shock dimensions changed, i think the larger factor playing into the height difference is the difference in shock valving and nitrogen charging pressures between the 2.
     
    Wynnded, TheBeast and JLS in WA like this.
  7. Nov 26, 2020 at 6:08 PM
    #37
    JLS in WA

    JLS in WA New Member

    Joined:
    Jan 1, 2020
    Member:
    #40610
    Messages:
    1,297
    Gender:
    Male
    Somewhere in the basalt rocks with my dogs
    Vehicle:
    2008 White DC Limited 4x4
    Drahthaar Transport Unit
    This was a heck of a deal.
     
  8. Nov 26, 2020 at 6:37 PM
    #38
    Terndrerrr

    Terndrerrr guzzling dealer repellent

    Joined:
    Jul 8, 2019
    Member:
    #32965
    Messages:
    4,911
    Gender:
    Male
    Music City
    Vehicle:
    Dual 5.7s
    TRD Fox, RAS, 285/75 DTs, dual battery, SS3 Pro
    Ok, so it’s the shock valving and different charging pressures between the two that has let them settle to different heights under the same empty bed load. This difference is what leads to the difference in the forces each shock is exerting against the axle and frame mounting points.

    I still think that the difference in length under no load of the shock is not completely negligible. But I digress...

    The important point is that I got a bit of lift in the rear by changing rear shocks.
     
    stuckinohio[QUOTED] likes this.
  9. Nov 26, 2020 at 7:05 PM
    #39
    stuckinohio

    stuckinohio MGM Crue

    Joined:
    Sep 3, 2018
    Member:
    #18972
    Messages:
    309
    Gender:
    Male
    First Name:
    Mark
    oHIo
    Vehicle:
    2018 SR5 Crewmax
    I support your argument that there was a height delta when switching.
    It is the same argument why Pro owners get worse sag when towing compared to non- pro owners.
    The compressed nitrogen in the shocks provides lift and it is likely creating differences in settling height
    If you wanted to disprove the nay-sayers, the most scientific method would be to force gauge both style shocks off truck and identify how much force it took to start movement.
    Times that value X2 and subtract the Pros from stock, that would tell you the lift force delta between the 2 shock styles.
    Theoretically if you added that delta (convert force to weight) added the weight to the Pro shocks, ride height would be the same. (theoretically)

    The length may be changing which compression zone the shock is in, and therefore impacting ride height.
    If you discharged the nitrogen and oil in both shocks, the truck should sit at identical heights and shock length would be negated.
     
    Terndrerrr[QUOTED] likes this.
  10. Nov 26, 2020 at 7:06 PM
    #40
    Danman34

    Danman34 New Member

    Joined:
    Sep 19, 2018
    Member:
    #19579
    Messages:
    2,231
    Gender:
    Male
    First Name:
    Danny
    Vehicle:
    2018 White Tundra TRD Sport
    No you didn’t. Rear shocks do not dictate lift. The shock appears longer because it has more downward travel. But by no means is it providing any lift.
     
  11. Nov 26, 2020 at 7:32 PM
    #41
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    The nitrogen charge doesn't do this. It is only there to pressurize the oil to keep it from going bubbly when they heat up. Pretty similar to how a radiator cap keeps the pressure in your cooling system to raise the boiling point. That doesn't affect where the piston attached to the shaft sits at static ride height. You have a separate piston separating the oil from nitrogen in the reservoir for these shocks. The piston attached to the shaft is free floating in oil and the static position is based on ride height, not the other way around.
     
  12. Nov 26, 2020 at 7:34 PM
    #42
    Honda287

    Honda287 New Member

    Joined:
    Nov 26, 2020
    Member:
    #55374
    Messages:
    14
    Gender:
    Male
    19 tundra trd
    Let me know if. Not sold tomorrow I will take the asap I want them
     
  13. Nov 26, 2020 at 7:36 PM
    #43
    stuckinohio

    stuckinohio MGM Crue

    Joined:
    Sep 3, 2018
    Member:
    #18972
    Messages:
    309
    Gender:
    Male
    First Name:
    Mark
    oHIo
    Vehicle:
    2018 SR5 Crewmax
    So based on that logic, if a shock is compressed, why does it return to full extension when the force is removed?
     
    Terndrerrr likes this.
  14. Nov 26, 2020 at 7:40 PM
    #44
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    Let me put it to you this way. I weigh 175lbs. I can compress the shock to full compression with less than my full my body weight. Do you think your truck can't do the same?

    Ride height has nothing to do with shocks. Pull the shocks out and your truck stands the same height. The 200psi is enough to extend the shaft when no resistance is applied, but nowhere near enough to raise a truck that weighs 5k lbs. It can't even hold my weight.

    To go a little further, once your shocks are installed its the valving in the piston that controls how easy it compresses or extends. The oil viscosity staying constant is important, if the oil heats up it will alter how freely the piston can travel. The nitrogen charge keeps this under control. Shocks meant for off road have a higher pressure to raise the boiling point vs stock style shocks.
     
    Last edited: Nov 26, 2020
  15. Nov 26, 2020 at 7:54 PM
    #45
    stuckinohio

    stuckinohio MGM Crue

    Joined:
    Sep 3, 2018
    Member:
    #18972
    Messages:
    309
    Gender:
    Male
    First Name:
    Mark
    oHIo
    Vehicle:
    2018 SR5 Crewmax
    So you're saying it requires force to overcome and compress the shock that is <175lbs?
    Shocks need to be slightly compressed during install as they want to fully extend, therefore the shock provides some upward force.....
    I am saying the delta between Pro/non-pro is significant enough to show ride height differences.
    I agree pulling shocks out, all trucks should be @ the same height. However i think shocks provide varying levels of positive forces lifting the rear end.
     
    Terndrerrr likes this.
  16. Nov 26, 2020 at 8:05 PM
    #46
    Darkness

    Darkness Allergic to white

    Joined:
    Jul 23, 2018
    Member:
    #17315
    Messages:
    9,976
    Gender:
    Male
    First Name:
    Luis
    All over SoCal
    Vehicle:
    The darkest
    It's really dark
    I have swapped shocks on my cars, my trucks, other peoples trucks. Doesn't alter ride height, not even if the old shock is blown out garbage. If you think I'm making it up, pull off a shock and put the stem on the ground, grab the eyelet and lean on it. It will fully compress because it isn't there to hold weight, it is there to control movement. The difference in pressure is not great enough to lift anything.

    By the way, the way you spelled Ohio, is that a reference to "whats round on the ends and high in the middle"? :rofl:
     
    ShinyConcretE likes this.
  17. Nov 26, 2020 at 8:59 PM
    #47
    stuckinohio

    stuckinohio MGM Crue

    Joined:
    Sep 3, 2018
    Member:
    #18972
    Messages:
    309
    Gender:
    Male
    First Name:
    Mark
    oHIo
    Vehicle:
    2018 SR5 Crewmax
    Typically aftermarket stays within the parameters set by OEM's to ensure compatibility and avoid risk of liability.
    There is alot of FMVSS testing the aftermarket wants to avoid due to high cost. The return on investment isn't there
    I agree with you that "typically" the difference in pressure is not great enough to lift or create a delta between old/new.
    I think Toyota decided to allow the suspension to function to its actual design limitations without the accountants cutting out options/capability
    If you look at it from Toyota's perspective, It's all about minimizing changes\investment\ tooling and maximizing profit.
    Changing just the shocks to Fox allows an up-charge for branding.
    Adding a reservoir, allows more travel as components (bladder) can be moved to reservoir.
    Increasing nitrogen pressure avoids cost of re-tooling shackles and leaf springs to create the lift they market for pro, so change only impacts 1 part not 3.
    My suspicion is Toyota shared some legit proprietary information with Fox regarding actual capability limitation of the tundra rear suspension that allowed Fox to make dimensional and valving changes to meet targets.
    Layouts can be done to reverse-engineer but if you don't know the full specs, you end up guessing at limitations through trial and error.

    Keen eyes, you're the first to acknowledge and/or pick-up that detail. :cheers:
     
  18. Nov 27, 2020 at 4:58 PM
    #48
    94slowbra

    94slowbra [OP] New Member

    Joined:
    Oct 30, 2017
    Member:
    #10617
    Messages:
    533
    Gender:
    Male
    First Name:
    john
    new orleans
    Vehicle:
    2016 TRD pro
    And SOLD! Ill list the wheels when I get them next week
     
  19. Nov 27, 2020 at 5:07 PM
    #49
    Terndrerrr

    Terndrerrr guzzling dealer repellent

    Joined:
    Jul 8, 2019
    Member:
    #32965
    Messages:
    4,911
    Gender:
    Male
    Music City
    Vehicle:
    Dual 5.7s
    TRD Fox, RAS, 285/75 DTs, dual battery, SS3 Pro
    Yep. And the proof is sitting in my driveway.
     
Thread Status:
Not open for further replies.

Products Discussed in

To Top