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redrilling perches to move axle forward on d60

Discussion in 'The Garage' started by muddybuddy, Feb 6, 2007.

  1. muddybuddy

    muddybuddy 3/4 ton status

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    im going to be running 52's up front, and want to push the axle forward another 1" or so from the 2-2.5" the 52's net. i dont want to run a zero-rate. how much farther back can you drill the hole on the pass side and still have it safe?
     
  2. bigbluesuburban

    bigbluesuburban 1/2 ton status

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    Coming from the structural steel industry here is a rule of thumb.

    Your hole should be at least one diameter away from the edge of the plate. This means that if you have 1/2" dia pin, the distance from the edge of the plate to the edge of the hole should be no less that 1/2". Also this applies to a drilled or machined hole, not a flame cut hole.

    This is not carved in stone, but like I said it's a good rule of thumb.
     
  3. Leper

    Leper 1/2 ton status

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    Good info there.
     
  4. muddybuddy

    muddybuddy 3/4 ton status

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    anybody got access to a d60 right now that could measure? im away from my truck so i dont have access to my 60 to see how far forward it will end up net'ing
     
  5. 1977k5

    1977k5 3/4 ton status Vendor

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    I'll be doing the same thing, post up when you figure it out.
     
  6. muddybuddy

    muddybuddy 3/4 ton status

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    has nobody else done this? i thought that more people had tried it
     
  7. muddermilitia

    muddermilitia ThatTrazerGuy GMOTM Winner

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    sorry dude, im wondering the same thing
     
  8. DPI

    DPI 1/2 ton status

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    You are probably tired of hearing from me on this stuff, but I moved my axle forward 1" by drilling the D60 perches. You also have to drill the top plates for the center pin clearance.

    This is the only pic I could find here at work that kind shows location of the front axle. I trimmed more of the front fenders due to tire to fender contact under flex. I posted those pics in your fender trimming post.:doah:

    [​IMG]
     
  9. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Sounds like as good a logic as any. :waytogo:
     
  10. gmc4cw

    gmc4cw 1/2 ton status GMOTM Winner

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    you could always drill an new hole through your spring pack.
     
  11. muddybuddy

    muddybuddy 3/4 ton status

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    dpi, thanks for the info. so after you drilled the hole 1" back there was still plenty of room to keep its strength?
     
  12. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    You could always get a new perch from DIY4x or Ruffstuff.
     
  13. 6.2Blazer

    6.2Blazer 1/2 ton status

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    I don't think that would help any considering the one side perch is cast right into the housing............
     
  14. muddybuddy

    muddybuddy 3/4 ton status

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    i thought about that but how will that work with the pass side perch on the 60?
     
  15. DPI

    DPI 1/2 ton status

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    Yeah, there was plenty of room left. IRCC the perchases are 5" long. So redrilling an inch from center is no problem.
     
  16. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    I was working from the assumption there is more room to play with on the passenger side cast pad. The driver's side has that extreme radius at the ends.
     
  17. Chaddy

    Chaddy 1/2 ton status GMOTM Winner

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    Grind it till its round and weld on a perch. ....Thats what a couple guys have done at teraflex
     
  18. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    did it on my 60, as I wrote in the 52" spring swap tech article. I drilled exactly 1" behind the stock holes. I don't know exactly how far from the edge that left me (more than 9/16" though)... but just looking at the perch I wasn't willing to move the center any more than that. Something about drilling any closer to the edge just tweaked my shady-tree engineer spidey sense.

    j
     
  19. muddybuddy

    muddybuddy 3/4 ton status

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    hmm, maybe i could get some "lift" perches as well to keep down the arch of the 52's so i can still get ~6-7" lift
     
  20. 1977k5

    1977k5 3/4 ton status Vendor

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    Sounds like a bad idea to me. Others seem to have had troubles with breaking springs that way.
     

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