Thread: 79' K20 with 1-Ton rear brakes from factory??
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Old 09-21-2023, 09:46 PM   #2
400/400
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Join Date: Sep 2014
Location: Central MN
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Re: 79' K20 with 1-Ton rear brakes from factory??
Do you have your SPID?

I believe it’s option JB7 for HD brakes.
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1979 K25 350/SM465/205/44HD/14FF
1985 K20 400/400/208/10/14
1987 V10 TBI350/700R4/208/10/10
'85 Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=643968
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