Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Bumpstop questions & Spacing

Discussion in 'The Garage' started by rcamacho, May 3, 2005.

  1. rcamacho

    rcamacho 1/2 ton status

    Joined:
    Jul 1, 2004
    Posts:
    1,324
    Likes Received:
    0
    Location:
    WA
    I've searched, here are some questions:

    1) guidelines for bumpstop to spring distance for 4" front 48" springs and stock rear 52" springs. I'm looking to keep them from going into negative arch. ORD suggested 3".

    2) guidelines for positive stop. E.g metal to metal contact. Same as #1. Guess the answer here is to ramp and test for interference in addition to limiting spring compression.

    3) 4.5" extended bump stop compression limits. I've heard that they can only go 2.25" on compression before risking breakage. Some articles out there have recommended fabricating positive stops to limit compression. one idea was to provide a female box section around the OD of the bumpstop 2.25" high.

    4) Square tube bump stop spacers - cheap way to space down factory bumps. Any pics? Strong enough? Too much leverage on the frame?
     
  2. rcamacho

    rcamacho 1/2 ton status

    Joined:
    Jul 1, 2004
    Posts:
    1,324
    Likes Received:
    0
    Location:
    WA
    Anyone?
     
  3. smokkey1

    smokkey1 1/2 ton status

    Joined:
    Jan 7, 2004
    Posts:
    2,677
    Likes Received:
    2
    Location:
    Los Angeles, CA

    That's what I did. I used 3/16th square tubing. so far so good. I have stuffed the tires pretty good without bending the square tubing. the sub is not here right now but when my dad get's back from work I'll snap some pictures.
     
    Last edited: May 5, 2005
  4. rcamacho

    rcamacho 1/2 ton status

    Joined:
    Jul 1, 2004
    Posts:
    1,324
    Likes Received:
    0
    Location:
    WA
    Thanks!
     
  5. RaisedK5

    RaisedK5 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    932
    Likes Received:
    0
    Location:
    Long Beach, CA
    It looks kinda hack, but here you go.

    [​IMG]
     
  6. smokkey1

    smokkey1 1/2 ton status

    Joined:
    Jan 7, 2004
    Posts:
    2,677
    Likes Received:
    2
    Location:
    Los Angeles, CA
    rcamacho- I totally forgot to take the picture last night. I'll get it for you later. but it bacially looks like that picture but it's only one square tubing 2x2 by 3/16
     
  7. rcamacho

    rcamacho 1/2 ton status

    Joined:
    Jul 1, 2004
    Posts:
    1,324
    Likes Received:
    0
    Location:
    WA
    Yuk!

    Wow, that looks like an accident waiting to happen. I'd be concerned about additonal side load on the frame mount and separation of the two square tube spacers.
     
  8. smokkey1

    smokkey1 1/2 ton status

    Joined:
    Jan 7, 2004
    Posts:
    2,677
    Likes Received:
    2
    Location:
    Los Angeles, CA
    here ya go

    BUMP.JPG
     
  9. RaisedK5

    RaisedK5 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    932
    Likes Received:
    0
    Location:
    Long Beach, CA
    The tubes are welded together and really, how much side load are you putting on it??? how much shock load are you really putting on bumpstops unless you're jumping the truck, its been that way for several years now, and hasn't moved a bit. and i stuff the tires into the wells regularly. I would like to replace them with something better, and will get around to that someday, but its hardly something that is going to cause an accident.
     
  10. captaininsano

    captaininsano 1/2 ton status

    Joined:
    May 4, 2004
    Posts:
    233
    Likes Received:
    0
    Location:
    Bay Area, CA
    uh why are you doing this? Want to limit flex???
     
  11. RaisedK5

    RaisedK5 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    932
    Likes Received:
    0
    Location:
    Long Beach, CA
    why?? cause when a 38.5" TSL and the firewall meet, it sounds really ugly.
     
  12. smokkey1

    smokkey1 1/2 ton status

    Joined:
    Jan 7, 2004
    Posts:
    2,677
    Likes Received:
    2
    Location:
    Los Angeles, CA
    so you don't jack up your springs from neg-arcing them.
     
  13. az-k5

    az-k5 1/2 ton status

    Joined:
    Oct 15, 2003
    Posts:
    2,774
    Likes Received:
    0
    Location:
    Phoenix AZ
    The sound is bad enough then you get to feel each lug grab the floor and try to play stong man with it.
     
  14. rcamacho

    rcamacho 1/2 ton status

    Joined:
    Jul 1, 2004
    Posts:
    1,324
    Likes Received:
    0
    Location:
    WA
    Thanks, looks pretty good. It appears that the sway bar hold-up bracket is slightly bent though. Did it contact the axle?
     
  15. smokkey1

    smokkey1 1/2 ton status

    Joined:
    Jan 7, 2004
    Posts:
    2,677
    Likes Received:
    2
    Location:
    Los Angeles, CA

    no problem, I bought the disco's used from an member here. They were already like that.
     
  16. rcamacho

    rcamacho 1/2 ton status

    Joined:
    Jul 1, 2004
    Posts:
    1,324
    Likes Received:
    0
    Location:
    WA
    I've been running the 4.5" extended bump stops for a few years now. My shocks are a tad too long (5012 on ford mounts) and the bump stops barely contact before bottoming the spring plate. Short story, I finally got around to putting some 2x3x5" rectangle tube spacers 3/16" thick under the 4.5" bump stops. I should be well into the bump before the shocks bottom now. Hopefully I can post some pictures later on and will confirm travel at the next articulation opportunity.
     
  17. rcamacho

    rcamacho 1/2 ton status

    Joined:
    Jul 1, 2004
    Posts:
    1,324
    Likes Received:
    0
    Location:
    WA
    :doah:Well, that experiment did not go so well. Both bump stops separated internally and took off somewhere on the trail. I recall reading that the 4.5" spacers need to be compression limited to 2.25" of travel or they will fail - they sure do.
     
  18. rcamacho

    rcamacho 1/2 ton status

    Joined:
    Jul 1, 2004
    Posts:
    1,324
    Likes Received:
    0
    Location:
    WA
    Pictures of what's left of the 4.5" stops.

    Truck 006.jpg

    Truck 007.jpg
     
  19. Stomis

    Stomis Professional Amateur Premium Member

    Joined:
    Nov 20, 2007
    Posts:
    10,024
    Likes Received:
    249
    Location:
    Roseland VA/PtPleasant NJ
    Goto advance auto they stock poly energy suspension bump stops for $12 a pair. I'll be using them front and rear.

    btw the best way to measure to not neg your springs is to go from spring eye to spring eye with a piece of string, measure it from the frame with however your mounting them and as said take into consideration how much they squish, make them a 1/2in long to play it safe and be done.
     
  20. BGKYK5

    BGKYK5 3/4 ton status GMOTM Winner

    Joined:
    Nov 1, 2006
    Posts:
    5,936
    Likes Received:
    2
    Location:
    on the crapper...
    Yup, those bump stops are all used up.
     

Share This Page