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Rear spring perch drilling
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=88&t=78520		 Page 1 of 1
Author:  ajohns1288 [ Sat Mar 08, 2014 10:28 pm ]
Post subject:  Rear spring perch drilling
So I never put in rear bump stops in back when I installed my lift in the fall but lately decided to do it just as a cheap insurance against a blown shock. I tried to do it with hockey pucks today and ended up with a broken step bit and smoking drill. I did get enough of a hole started to use a self tapping bolt, however that also twisted apart so now I'll have to drill that out too :furious: The only good that came from me wrenching today was adding an iso to level out the infamous KK lean.

To those of you that drilled through the perch mount, what did you use to drill and how did you fasten it? The drill and bits I used were all harbor freight specials, which could explain the breaking.
Author:  huntb [ Sat Mar 08, 2014 10:59 pm ]
Post subject:  Re: Rear spring perch drilling
ajohns1288 wrote:
So I never put in rear bump stops in back when I installed my lift in the fall but lately decided to do it just as a cheap insurance against a blown shock. I tried to do it with hockey pucks today and ended up with a broken step bit and smoking drill. I did get enough of a hole started to use a self tapping bolt, however that also twisted apart so now I'll have to drill that out too :furious: The only good that came from me wrenching today was adding an iso to level out the infamous KK lean.

To those of you that drilled through the perch mount, what did you use to drill and how did you fasten it? The drill and bits I used were all harbor freight specials, which could explain the breaking.


A few different sized carbide drill bits made quick work out of mine. Why did you try to use a step bit?
Author:  At The Helm [ Sun Mar 09, 2014 12:26 am ]
Post subject:  Re: Rear spring perch drilling
Wow never seen a step bit break, gotta love harbor freight. I usually grab my unibit when I need to enlarge a hole rather than starting one. Go as slow as you can with heavy pressure and use motor oil as cutting fluid. A right angle adapter (or better yet a right angle drill) will make it more comfortable too.
I was too lazy to drill mine out so I just "glued" them in with rtv sealer. I only run one per side which works great and they haven't fallen out for over a year.
Author:  Scar0 [ Sun Mar 09, 2014 12:36 am ]
Post subject:  Re: Rear spring perch drilling
I used a drill, a 90° angle adapter, and a 13/32” standard drill bit, after I center punched the drilling point. Had no problems at all. You do need to temporarily remove the upper bump stop to get enough room though.
You can see Pics in the How-to part 2.
Author:  tommudd [ Sun Mar 09, 2014 5:07 am ]
Post subject:  Re: Rear spring perch drilling
Quality drill bits are the key, like anything else cheaper ones just don't get it
I've drilled a bunch of them starting them with a 1/4 inch 90 degree Sears drill I bought in 1970 and finish with a regular drill and 3/8 inch drill bit
Author:  DREDnot [ Sun Mar 09, 2014 6:22 am ]
Post subject:  Re: Rear spring perch drilling
I just used a regular American quality drill bit. Harbor freight drill bits don't cut the mustard.
Drilled nicely through the pucks, too.

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