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Old 06-17-2016, 08:36 PM   #1
Stm3784
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Frame questions

Hi, so I have a question. When did GM change the crossmember location on the 73 to 87 four-wheel-drive three-quarter ton pick up? I've heard In 1985 and the crossmember location was different, and the frame wasn't as strong. Can anybody please provide some input to this
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Old 06-18-2016, 10:02 AM   #2
74CustomK20
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Re: Frame questions

Which crossmember?
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Old 06-18-2016, 11:07 PM   #3
Stm3784
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Re: Frame questions

The riveted rear one where the spring hangers are.
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Old 06-18-2016, 11:12 PM   #4
KrazyRay
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Re: Frame questions

I remember all of the rear crossmembers being in the same place. They did cut ovals out of them to reduce cost/weight.
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Old 06-21-2016, 08:13 AM   #5
74CustomK20
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Re: Frame questions

My 80's 1 ton frame doesn't have the holes drilled, and is riveted in. Idk if it helps but it was in the same location as my 79 k10.
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