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Old 09-01-2013, 09:10 PM   #1
factorystock
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HO 72 ratio?

Looking at a 1970 C -30. Anybody know the option code on SPID for the optional 4.10 ratio on C 30's? It is 8 lug Ho 72 with dual wheels.
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Old 09-01-2013, 09:57 PM   #2
farmall
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Re: HO 72 ratio?

http://67-72chevytrucks.com/vboard/s...=590959&page=2

This is 71 72 You can see they changed the first letter in the next year.
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Old 09-01-2013, 10:43 PM   #3
special-K
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Re: HO 72 ratio?

IIRC the option code is HO9 for 4.11 3600# axle
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