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Old June 13th, 2012, 11:12 PM   #1
chevotass
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Default drilling out steering box bolt holes?

wondering if anyone sees anything wrong with drilling out the holes on a steering box.

its a chevy 2wd box that has threaded 7/16 holes. i want to sleeve my frame where it bolts with 3/4od x 1/2" id tubing. so i was thinking of drilling out the threads to 1/2" holes and thru bolting it.

anybody see this as a bad idea?
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Old June 13th, 2012, 11:18 PM   #2
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How big are the bolts that thread into it? I thought they were not that far off from being 1/2 inch to begin with. I honestly see no problem in doing this as long as there is still a decent amount of metal left around the mounting holes. It is something that is difficult to give a straight yes or no without physically looking at it.
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Old June 13th, 2012, 11:27 PM   #3
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If it will work 1/2" sch 160 pipe will be a good fit for the 7/16 bolts. It will be approximately 7/8 od.
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Old June 13th, 2012, 11:42 PM   #4
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i did this on our racing machine car race truck hybrid xj, but i did it because we stripped the holes out. its been going strong for 180 race miles. only driven on saturday nights.
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Old June 14th, 2012, 06:08 AM   #5
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Nick,
I had to drill out one because I stripped it. The downside is that one of the ears is radiused on the back side where the casting flows into the main body of the steering box. So, a standard nut will not fit behind it. I ended up grinding a big radius on a nut and modified the casting a bit to make it fit. It was a PITA. I considered a heli coil but didn't want to pull the whole steering box. If there is nothing wrong with the threads, I like the idea of the schedule 160 pipe. It has a thick enough wall that if you decided to drill it out later you still can.
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Old June 14th, 2012, 06:25 AM   #6
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Just keep in mind with the sch 160 you will need to get that from a pipe supplier, not a steel yard. If they don't have any drops just get 3 threaded nipples and cut the threads off. That is what i did.
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Old June 14th, 2012, 10:30 PM   #7
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thanks for the info everyone. looks like a got a project for saturday now
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