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#1 |
Registered User
Join Date: Sep 2003
Location: Boise ID
Posts: 609
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Rear End
I have A "70" with 6 lug axles 308. Found one for sale out of A "72" auto truck for sale I am going to look at. Aren't the auto trucks 373 gears and are they not A narrower rear end? How much narrower? Is the swap over to narrower when they went from 6 lug to 5 lug?
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"72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES" ![]() |
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#2 |
Registered User
Join Date: Mar 2009
Location: Youngsville, NC
Posts: 952
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Re: Rear End
I'm not sure about the gear ratio, but the 71 and 72 12 bolt rear ends are approximately 1.5" WIDER than the 67-70 rear ends. I believe that this coincides with the 6 lug to 5 lug switchover. Hopefully someone else will confirm.
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1969 C10 SWB Project Charity Case AKA "Roscoe" 1971 Cheyenne Super A Combined Effort The Service Station-A practical ministry for those in need |
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#3 |
Grand PooBaa Member
Join Date: Jan 2001
Location: LA, CA
Posts: 5,302
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Re: Rear End
I can only tell you 1970 and later rearends are different from 69 on down.
Found out the hard way when I took a 3:73 rearend out of a 71 6 cyl truck to put in my 69. Once installed, the the passenger side axle went in deeper than the driver side. 70 and up one axle is shorter than the other. |
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#4 |
Senior Member
Join Date: Jul 2010
Location: South Dakota
Posts: 4,093
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Re: Rear End
So you cant swap a 71 rearend into a 69 chevy truck?
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1969 Chevy c20(Miss Hackjob) |
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Rear End
67 to early 70 were narrow, mid 70 - 72 were wider by 3/4 inch on BOTH sides.
no 3.08 gears stock in 67 - 72, that was a car gear back then. The 3.07 gear was the standard gear in most non big block automatic and 4 speed 1/2 ton trucks. The 3.73 gear was the standard gearset in most 3 speed 1/2 ton trucks. There were exceptions in certian years with certian engines, but that is the generic rule on gearing. |
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#6 |
Registered User
Join Date: Sep 2003
Location: Boise ID
Posts: 609
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Re: Rear End
So is it safe to say that my 6 lug "70" is the narrow rear end since its 6 lug??
Gary
__________________
"72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES" ![]() |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Rear End
actually no. The odds are more likely to be yhat it is the longer one. The wide rear seems way more common over the narrow one.
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