Cross Member Question - Why - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RyansToy · 07-11-2018, 03:03 PM

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

Is it to reduce stress\stiffness?

**clay68c10** · 07-11-2018, 03:27 PM

The e-brake cables run thru there, that's the only purpose I see.

**StingRay** · 07-11-2018, 04:39 PM

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.

**lolife99** · 07-12-2018, 02:07 AM

Wiring?
Fuel lines?
Brake lines?

**oldgold70c10** · 07-12-2018, 08:52 AM

GM called this alligator jaws in their brochures....

firedemon · 07-12-2018, 07:54 PM

why the glass pack and then regular muffler

Chilly178 · 07-12-2018, 08:05 PM

Quote:

Originally Posted by firedemon

why the glass pack and then regular muffler

This is the real mystery here.

**Steeveedee** · 07-12-2018, 08:40 PM

Those are for weight reduction.

**kwmech** · 07-12-2018, 11:07 PM

I'd put my money on frame twist so the x-member won't tear or crack

RyansToy · 07-13-2018, 02:05 PM

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.

Hutch · 07-13-2018, 03:52 PM

X2

Quote:

the e-brake cables run thru there

07-11-2018, 03:03 PM	#1
RyansToy Registered User Join Date: Aug 2015 Location: Nova Scotia Canada Posts: 145	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? __________________ 1968 GMC truck 910 Trim (Canadian) 127" WB 3 on the Three Trans (Saginaw SM330) 250 ci L6 Engine HEI ignition (early 80s L6)

07-11-2018, 03:27 PM	#2
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,995	Re: Cross Member Question - Why The e-brake cables run thru there, that's the only purpose I see. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

07-11-2018, 04:39 PM	#3
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,487	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. __________________ Saskatoon, Saskatchewan Canada

07-12-2018, 02:07 AM	#4
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,717	Re: Cross Member Question - Why Wiring? Fuel lines? Brake lines? __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

07-12-2018, 08:52 AM	#5
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,025	Re: Cross Member Question - Why GM called this alligator jaws in their brochures.... __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel

07-12-2018, 07:54 PM	#6
firedemon Registered User Join Date: Jun 2015 Location: @ Posts: 890	Re: Cross Member Question - Why why the glass pack and then regular muffler

07-12-2018, 08:40 PM	#8
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,946	Re: Cross Member Question - Why Those are for weight reduction. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

07-12-2018, 11:07 PM	#9
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,718	Re: Cross Member Question - Why I'd put my money on frame twist so the x-member won't tear or crack

07-13-2018, 02:05 PM	#10
RyansToy Registered User Join Date: Aug 2015 Location: Nova Scotia Canada Posts: 145	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. __________________ 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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