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Front Bed Header Height Higher Than Side Rails

Discussion in '3rd Gen. Tacomas (2016+)' started by intels, Mar 14, 2021.

  1. Apr 25, 2021 at 4:13 AM
    #21
    dansflhti

    dansflhti Well-Known Member

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    If a guy elongated the mounting holes in the front bed rail,would that allow the rail to be adjusted lower?
     
  2. Apr 25, 2021 at 4:20 AM
    #22
    cop414

    cop414 Well-Known Member

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    Curious as to how you’re making out with the diamondback? I’m on the fence about one but there have been several threads about them leaking, not where the rail is but in the area where the door are hinged at the center section. Any problems with the difference in height there on the front rail?
     
  3. Apr 25, 2021 at 4:21 AM
    #23
    cop414

    cop414 Well-Known Member

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    I don’t know if that’s possible because of the ridges on the bed, I think that they would prevent the rail from dropping any lower. Look at your bed, I don’t think that would be physically possible to do.
     
  4. Apr 25, 2021 at 4:25 AM
    #24
    dansflhti

    dansflhti Well-Known Member

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    Yeah...I dont know if the front of that rail actually sits on top of the composite bed...I'll have a look later.
     
  5. Apr 25, 2021 at 4:49 AM
    #25
    dansflhti

    dansflhti Well-Known Member

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    I havent checked mine yet,but after looking at the first pic in this thread I understand what you are saying about the bed ridges.
     
  6. Apr 25, 2021 at 5:52 AM
    #26
    kiwiyyc

    kiwiyyc Member

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    What I’ve found with the DB is that you need to progressively tighten it down as the gasket settles and forms over the bed rail caps’ variations. Same applies to the front rail. So far there has only been a very small amount of water get it through the front and I’m pretty sure I’ve got that sorted for good now (got the wife to lie on the panels as I tightened them).

    What I also did was install the factory rubber plugs, which requires taking the bed rail caps off. Since they were off, I ran a bead of silicon on the inside edge - no water has got in that way. You have to trim the bed rail cap a little to get it back on over the OEM rubber plugs and then fill the small gap on top with silicon. Some pictures below.

    I’m pretty happy with my DB as it is well made and it’s the only cover on the market that fits our needs. Like most things, just a few tweaks required and the instructions do say that you need to adjust as the gaskets settle.

    52D1D8D2-F3B7-40D8-91D7-80C751365DD0.jpg
    7A6E4D2B-E700-475F-97AD-93C64BC44E0B.jpg
    6A3D6928-2559-41F3-A72C-E37B9085AADD.jpg
     
    Last edited: Apr 25, 2021
    rizrox likes this.
  7. Apr 25, 2021 at 6:06 AM
    #27
    cop414

    cop414 Well-Known Member

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    Exactly the information that I was lookin for. I was going to seal under the bed rail caps too. I have the factory cover so I want to replace them also. My thoughts were exactly as yours, slow even tightening of all three parts of the diamondback. I’ve seen pics where some have tightened down the center rail so hard that the rail caps started to deform. No need to go nuts on it like that but keep all the tightening equal between the access doors and the center piece.
    I think that’s a great thing about that cover is the adjustment on the tightening until everything settles in. which version did you go with?
     
  8. Apr 25, 2021 at 6:15 AM
    #28
    GrundleJuice

    GrundleJuice Well-Known Member

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    [S]Un-Molested[/S] Lightly Molested
    those appear to be for filling the gap between the front and side rails but I don't see how they could help with sealing with a height difference.
     
  9. Apr 25, 2021 at 6:20 AM
    #29
    kiwiyyc

    kiwiyyc Member

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    Glad that’s what you’re looking for! It was pretty easy to get the bed rail caps off too, with no damage. Get some plastic trim tools and take your time.

    We went with the SE. I also got the FrontRunner system from DB so we can mount bikes on top. Given the payload of my Tacoma is only 945 lbs, there was no need to go for the HD as we’d never make use of the extra carrying capacity (and associated extra expense!). Also grabbed a CrossBin 8 which is awesome and leaves tons of room underneath for skis etc. I will say too that the DB customer service has been really good and responsive to questions. You leaning any particular direction for the cover model?
     
  10. Apr 25, 2021 at 6:21 AM
    #30
    3JOH22A

    3JOH22A Cunning Linguist

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    Nope. The square tube sits on top of the header board.

    Most tonneaus designed for the 3rd gen have a thinner seal at the front to account for the difference. My Extang Encore is like that.
     
  11. Apr 25, 2021 at 6:28 AM
    #31
    kiwiyyc

    kiwiyyc Member

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    That’s correct but with the Diamondback’s, the gasket seal deforms so the height difference, in mine at least, is no longer an issue.
     
  12. Apr 25, 2021 at 6:35 AM
    #32
    dansflhti

    dansflhti Well-Known Member

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    Thanks so muchSaves me the trouble of removing the Extang Solid fold I installed yesterday.I'm just not 100% happy with the way it sits at the front.
     
  13. Apr 25, 2021 at 6:37 AM
    #33
    RushT

    RushT Amateur Everythingist

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    2018, same.
     
  14. Apr 25, 2021 at 6:41 AM
    #34
    shotgunbilly420

    shotgunbilly420 Well-Known Member

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    Uhhh where can I ordered these plugs
     
  15. Apr 25, 2021 at 6:43 AM
    #35
    cop414

    cop414 Well-Known Member

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    Leaning towards the SE smooth. What did you use under the caps, looks like silicone? There’s a couple threads here where the weatherstripping on the hinge side at the center appears to have been cut short, hopefully that’s no longer a problem. I’m about 90 minutes from the factory so if there’s a problem I’d assume I could have them look at it.
    Now I just have to talk myself into swallowing the price! Damn they’re expensive.
     
  16. Apr 25, 2021 at 6:44 AM
    #36
    cop414

    cop414 Well-Known Member

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    Good to know.
     
  17. Apr 25, 2021 at 6:58 AM
    #37
    kiwiyyc

    kiwiyyc Member

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    @cop414, yup just black exterior window/door silicon. I let it fully cure before putting the cap rails back on. That gap issue between the centre panel and panels seems to be diminishing with mine as it gets tightened down - I’ll likely just have to add a couple of small weatherstripping patches but we’ll see if it’s necessary. And yeah, they ain’t cheap - and I’m in Canada so that added another 25%!

    One other thing that I’ll add - the bare aluminum underneath the DB covers works really well with the OEM bed lights. The reflection means the whole bed is nicely illuminated!
     
    Last edited: Apr 25, 2021
  18. Apr 25, 2021 at 7:20 AM
    #38
    cop414

    cop414 Well-Known Member

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    Yikes that’s even worse price wise!
     
    kiwiyyc likes this.
  19. May 3, 2021 at 1:08 PM
    #39
    TACO TM

    TACO TM Well-Known Member

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    I forgot to circle back...

    Elongating the bolt holes on the front rail in an attempt to drop it down to match the height of the bedside tops will not accomplish anything. The square rail itself is what sets the height from the top of the composite bed tub.
     
  20. May 3, 2021 at 9:14 PM
    #40
    rizrox

    rizrox Active Member

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    BUILD ON DELIVERY (OEM) Premium OR Package Technology Package LED Headlights and Fog Lights All Weather Floor Liners Door Sill Protectors 5" Oval Tube Steps Black Exhaust Tip Black Mud Guards Remote Tailgate Lock Tailgate Insert Black Bed Mat Bed Lighting Kit Glass Breakage Sensor ——————————————————————— MODS AND ADDITIONS (in order) JDMCAR Glove Box Organizer JDMCAR Center Console Divider & Tray SaBellCo Tailgate Lock OEM Spare Tire Lock Total Chaos Bed Stiffeners OEM 4x4 Badge OEM Blackout Badge Overlays OEM Bed Front 3rd Accessory Rail Cubby Covers OEM Bed Header Rail End Caps Sealed Weatherproofed Bed Rail Caps A/C Drain Mod
    I uninstalled, sealed, and reinstalled along with the front tie down rail and now mine is more level. YMMV
     
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