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ranger danger · 02-01-2015, 07:12 AM

I believe the diff is an Eaton HO52. My research shows they came stock with 4.56's and a few 4.10's. You could special order them with 5.12's. I don't think mine has anywhere near 3.54's. Its running 3000 rpm at 60 mph. I'll be lifting it up today to find out. If it is what I think it is, the highest ratio I could find made for it is 3.90.

02-01-2015, 07:12 AM	#16
ranger danger Registered User Join Date: Jan 2015 Location: Vacaville CA Posts: 896	Re: New to me 69' C20 Suburban I believe the diff is an Eaton HO52. My research shows they came stock with 4.56's and a few 4.10's. You could special order them with 5.12's. I don't think mine has anywhere near 3.54's. Its running 3000 rpm at 60 mph. I'll be lifting it up today to find out. If it is what I think it is, the highest ratio I could find made for it is 3.90.