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12-24-2015, 05:34 PM
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#1 |
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Registered User
Join Date: Nov 2007
Location: Silverdale,Wa
Posts: 48
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1969 Help please -C20 Rear end change
Have a 69 C20 with an 8 lug ,4.10 diff & truck arms,lowered 5 1/2".Looking for ideas to change to a 3.50 ratio,8 or 6 lug.I see a lot of 3.73 ratios in the trucks,ideas please.
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12-24-2015, 05:38 PM
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#2 |
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Registered User
 Join Date: Apr 2015
Location: Yakima, WA
Posts: 362
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Re: 1969 Help please -C20 Rear end change
so you are trying to go 3/4 ton to 1/2 ton.?
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12-24-2015, 10:46 PM
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#3 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,728
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Re: 1969 Help please -C20 Rear end change
You can get 3.23 or 3.42 gears in either the FF or SF GM 14 bolts, but 3.73 is by far the most common in either flavor. You can relatively easily get 3.54 in a Dana 60 but not super easy to find in the coil sprung variety and obviously either of the 14's requires welding.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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12-25-2015, 08:17 PM
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#4 |
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Registered User
Join Date: Nov 2007
Location: Silverdale,Wa
Posts: 48
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Re: 1969 Help please -C20 Rear end change
Would prefer to keep it a 3/4 ton & locate a bolt in replacement with a taller gear.
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12-25-2015, 08:21 PM
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#5 |
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Registered User
Join Date: Nov 2007
Location: Silverdale,Wa
Posts: 48
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Re: 1969 Help please -C20 Rear end change
Thanks Mike. just had the TH400 built up & was hoping to avoid the expense of a Gear Vendors.Wanted something I could pound on,so my tranny man said to stay with a 3 speed.
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12-25-2015, 08:30 PM
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#6 |
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Registered User
Join Date: Nov 2007
Location: Silverdale,Wa
Posts: 48
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Re: 1969 Help please -C20 Rear end change
Mike,IF you were to look for the Dana 60,what would it be in & is that an 8 lug? Thanks
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12-25-2015, 08:36 PM
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#7 |
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Registered User
Join Date: Jan 2014
Location: Aloha, Or.
Posts: 46
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Re: 1969 Help please -C20 Rear end change
You could find a (inexpensive) used Dana 60 with a 3.54 ratio from a big block truck that would be a bolt-in swap.
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12-25-2015, 09:22 PM
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#8 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,728
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Re: 1969 Help please -C20 Rear end change
What he said. 69-72 C20 Chevy or GMC with a coil sprung rear. Would have needed to be a big block truck most likely for the 3.54 gear set.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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