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Re: HD suspension trucks (F60 code on my K5 blazer)
Looks like the F60 option got you the heavy duty front springs (3 leaf, 2250 lbs vs the regular 2 leaf, 1650 lbs packs) and heavy duty front and rear shocks (for 1978)
Starting in '81 you could get the F60 option with or without the Z75 quad front shock option.
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
'17 GMC Yukon XL
VCCA member #58596
http://www.nohrco.com
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