68-72 frame - shock hole measurement - Chevelle Tech
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post #1 of 21 (permalink) Old Jul 8th, 19, 1:10 PM Thread Starter
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Chris
 
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68-72 frame - shock hole measurement

Does anyone know the factory distance between the UPPER bolt holes for the shocks on the frame?

My frame it measures 31-1/8" or so. I bought a UMI cross brace and it doesn't fit, it's too short. UMI thinks my frame is wrong, so I want to get some actual data.

Thanks

1971 Chevelle SS454, T56 Magnum 6 speed, 3.31 Posi

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post #2 of 21 (permalink) Old Jul 12th, 19, 12:52 AM
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Re: 68-72 frame - shock hole measurement

I can check mine in the morning if you still need it?
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post #3 of 21 (permalink) Old Jul 12th, 19, 11:43 AM
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Re: 68-72 frame - shock hole measurement

If you still need it........rear most bolt hole 31'' center to center
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post #4 of 21 (permalink) Old Jul 12th, 19, 3:56 PM
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Should be 33 3/4 center to center. (Rear shock holes 68-72) and 31” for 67 and down had that backwards 31 for the 68-72 and 33 3/4 for 67 and down
Did they send you the front brace that goes across the front sway bar that would be shorter I believe.
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post #5 of 21 (permalink) Old Jul 12th, 19, 3:59 PM
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post #6 of 21 (permalink) Old Jul 12th, 19, 5:25 PM
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Steve
 
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Re: 68-72 frame - shock hole measurement

What are the dimensions of the brace they sent you? How much too short is it?

I'm curious, as I bought one that I haven't installed yet (and it's not handy so I can't measure it right now) and now I'm concerned that mine won't fit...

1972 Chevelle, 454, 2004r, 4.10
1981 Camaro Z28, 355, TH350, 3.73
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post #7 of 21 (permalink) Old Jul 12th, 19, 9:11 PM Thread Starter
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Chris
 
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Re: 68-72 frame - shock hole measurement

Yeah UMI is full of it lol. That's now 3 measured 31-31.25"

Their cross brace measures 30 7/8" at the MAX adjustment width (one side has oval holes).

The center of the oval hole should measure 31" which would give a good 3/8" range in either direction. But not the case.

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post #8 of 21 (permalink) Old Jul 12th, 19, 9:45 PM
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Steve
 
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Re: 68-72 frame - shock hole measurement

So in your case, you are off by about 1/4"? I.e. It needs to be 1/4" wider to fit properly?

Sounds like the brace is 1/8" too short for factory specs, and your frame is 1/8" wider than factory spec? Did I read this all correctly?

I'll have to wait and see how mine measures and fits. Given my good luck with UMI so far, I'm hopeful.

1972 Chevelle, 454, 2004r, 4.10
1981 Camaro Z28, 355, TH350, 3.73
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post #9 of 21 (permalink) Old Jul 12th, 19, 10:05 PM
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My guess is UMI will step up and make it right. 30 7/8 is really close but if yours is 30 1/8 that’s 1/4 inch off how’s the mounting is it slotted to allow for factory tolerance? Most after market parts are going to need a little finessing. A ratchet strap and bolting the bar down would get you into spec.
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post #10 of 21 (permalink) Old Jul 12th, 19, 10:24 PM
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Re: 68-72 frame - shock hole measurement

For what it's worth, my 1965 measures 29-3/4"

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post #11 of 21 (permalink) Old Jul 12th, 19, 10:30 PM
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Re: 68-72 frame - shock hole measurement

Quote:
Originally Posted by Jasons 69 Chevelle View Post
Should be 33 3/4 center to center. (Rear shock holes 68-72) and 31” for 67 and down had that backwards 31 for the 68-72 and 33 3/4 for 67 and down
Did they send you the front brace that goes across the front sway bar that would be shorter I believe.
I'm not sure where you're getting that information but it is not on the diagram you posted.

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post #12 of 21 (permalink) Old Jul 12th, 19, 11:11 PM
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post #13 of 21 (permalink) Old Jul 13th, 19, 1:29 AM Thread Starter
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Re: 68-72 frame - shock hole measurement

Quote:
Originally Posted by Jasons 69 Chevelle View Post
My guess is UMI will step up and make it right. 30 7/8 is really close but if yours is 30 1/8 that’s 1/4 inch off how’s the mounting is it slotted to allow for factory tolerance? Most after market parts are going to need a little finessing. A ratchet strap and bolting the bar down would get you into spec.
Seems like there is nothing they can do. They are saying they sell 1000's of these and my 2 examples were the only ones that were wrong. They were willing to take the bar back, but that didnt help me. I had to modify it.

Their design is a good idea, it just should be 31" to the center of the oval hole to allow for adjustment. On 68-72 frames at least.

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post #14 of 21 (permalink) Old Jul 13th, 19, 7:25 AM
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Quote:
Originally Posted by -SS454- View Post
Quote:
Originally Posted by Jasons 69 Chevelle View Post
My guess is UMI will step up and make it right. 30 7/8 is really close but if yours is 30 1/8 that’s 1/4 inch off how’s the mounting is it slotted to allow for factory tolerance? Most after market parts are going to need a little finessing. A ratchet strap and bolting the bar down would get you into spec.
Seems like there is nothing they can do. They are saying they sell 1000's of these and my 2 examples were the only ones that were wrong. They were willing to take the bar back, but that didnt help me. I had to modify it.

Their design is a good idea, it just should be 31" to the center of the oval hole to allow for adjustment. On 68-72 frames at least.
I was going to order the bars myself, but I think your absolutely right about the measurements 31 should be directly center. That one may have gotten past quality control. Someone that works there should be willing to get a tape measure and find one that is 31 on center. I ordered some 4130 steel .250 flat stock and 1 inch x .120 tubing and will make my own. Cost $20 for the flat stock and $28 for the tubing. Enough for both bars. That gives me a little welding/fab project.
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post #15 of 21 (permalink) Old Jul 13th, 19, 8:19 AM
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Steve
 
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Re: 68-72 frame - shock hole measurement

What mods did you have to make to it?

Quote:
Originally Posted by -SS454- View Post
Seems like there is nothing they can do. They are saying they sell 1000's of these and my 2 examples were the only ones that were wrong. They were willing to take the bar back, but that didnt help me. I had to modify it.

Their design is a good idea, it just should be 31" to the center of the oval hole to allow for adjustment. On 68-72 frames at least.

1972 Chevelle, 454, 2004r, 4.10
1981 Camaro Z28, 355, TH350, 3.73
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