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Author Topic: 4x4 Frame crack.  (Read 4433 times)

Offline Engineer

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4x4 Frame crack.
« on: March 06, 2010, 08:55:10 pm »
Without fail every 73~87 Chevy 4x4 truck that I have seen has this crack in it's front/engine crossmember.

This picture is from my '77 K-30. It has been there every since I bought the truck when it was 10 years old.

What causes it? Stress I am sure, but what/why?

I know it doesn't hurt anything, because my frame measures out to be square, and true.

Should I weld it, or just forget about it?

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2002 Chevy 2500HD 4x4 8.1/ZF6sp RC/LB
2001 Chevy 2500HD 4x4 6.0/4L85E EC/SB
1997 Chevy Blazer 4x4
1994 Chevy K-2500 4x4 C6P 5.7/4L80E
1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454

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Offline 1984k30

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Re: 4x4 Frame crack.
« Reply #1 on: March 06, 2010, 11:50:05 pm »
Not sure why it cracked but I would weld it up.  Before you weld I would drill a hole at the end of the crack to help stop it from cracking again.
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Offline Captkaos

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Re: 4x4 Frame crack.
« Reply #2 on: March 07, 2010, 10:21:23 am »
Frame stress from the Steering box turning tires.
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Offline Lucky73

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Re: 4x4 Frame crack.
« Reply #3 on: March 07, 2010, 03:59:20 pm »
even my 2wd had cracks on the frame rail wherethe steering box mounted.
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73 Chevy C10
73 GMC K20
93 Chevy S-10
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