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Old 07-11-2018, 03:03 PM   #1
RyansToy
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Cross Member Question - Why

What is the purpose of the odd cut outs on either end of this cross member?

Is it to reduce stress\stiffness?

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Old 07-11-2018, 03:27 PM   #2
clay68c10
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Re: Cross Member Question - Why

The e-brake cables run thru there, that's the only purpose I see.
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Old 07-11-2018, 04:39 PM   #3
StingRay
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Re: Cross Member Question - Why

I'd say so that it can be installed. Tolerances are such that it's tough to make a part of one piece that will always fit internally. The cut outs let it flex outward or inward and then it gets riveted in place.
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Old 07-12-2018, 02:07 AM   #4
lolife99
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Re: Cross Member Question - Why

Wiring?
Fuel lines?
Brake lines?
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Old 07-12-2018, 08:52 AM   #5
oldgold70c10
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Re: Cross Member Question - Why

GM called this alligator jaws in their brochures....
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Old 07-12-2018, 07:54 PM   #6
firedemon
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Re: Cross Member Question - Why

why the glass pack and then regular muffler
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Old 07-12-2018, 08:05 PM   #7
Chilly178
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Re: Cross Member Question - Why

Quote:
Originally Posted by firedemon View Post
why the glass pack and then regular muffler
This is the real mystery here.
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Old 07-12-2018, 08:40 PM   #8
Steeveedee
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Wink Re: Cross Member Question - Why

Those are for weight reduction.
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Old 07-12-2018, 11:07 PM   #9
kwmech
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Re: Cross Member Question - Why

I'd put my money on frame twist so the x-member won't tear or crack
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Old 07-13-2018, 02:05 PM   #10
RyansToy
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Re: Cross Member Question - Why

Glass pack was on when I bought it. I wanted it quieter. Threw a muffler on the back.

Funnily enough it sounds good now.

I have 2.25" stainless pipe and a magnaflow on the way. It's low on the priority list right now. Rebuilding the cab is time consuming....

In the driveway no less ��. Waiting for the neighbors to complain.
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1968 GMC truck
910 Trim (Canadian)
127" WB
3 on the Three Trans (Saginaw SM330)
250 ci L6 Engine
HEI ignition (early 80s L6)
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Old 07-13-2018, 03:52 PM   #11
Hutch
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Re: Cross Member Question - Why

X2
Quote:
the e-brake cables run thru there
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