What gear ratio did the manual trans inline -six come with??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jkaylor68gmc · 09-17-2008, 10:54 AM

Trying to do some math and I cannot figure out which rear-end gear I have. any ideas.

P,S, its a 12 bolt and a 1965 C-10 rear-end

kizer · 09-17-2008, 02:19 PM

3.07
3.73
4.11

I haven't located the tag on my rear end as of yet, but I was told by somebody I might have a 3.73 rear end on mine, but until I find it, its all guess work.

MikeN · 09-18-2008, 10:09 AM

95% of them seem to be 3.73's

jkaylor68gmc · 09-18-2008, 10:16 AM

man, it seems like mine is a 4:11, It may have a 3:73, can't you turn the drivesahft and count how many times the wheel turns?

justcuz · 09-22-2008, 12:43 AM

You can pull the cover and change the fluid. When you do that the R&P numbers will be stamped in the ring gear. Divide the little number into the big number and it will tell you the ratio.

09-17-2008, 10:54 AM	#1
jkaylor68gmc Senior Member Join Date: Dec 2005 Location: TN Posts: 2,448	What gear ratio did the manual trans inline -six come with??? Trying to do some math and I cannot figure out which rear-end gear I have. any ideas. P,S, its a 12 bolt and a 1965 C-10 rear-end __________________ 1947 International KB-1 1957 Chevy Bel-Air riding low 1962 swb fleetside 2002 Chevrolet Silverado 7-inch lift on 35 Daily driver 2016 Chevy Tahoe Better halves ride Last edited by jkaylor68gmc; 09-17-2008 at 10:54 AM.

09-17-2008, 02:19 PM	#2
kizer Its Deja Vu time again Join Date: Aug 2008 Location: Marysville, North of Seattle WA Posts: 815	Re: What gear ratio did the manual trans inline -six come with??? 3.07 3.73 4.11 I haven't located the tag on my rear end as of yet, but I was told by somebody I might have a 3.73 rear end on mine, but until I find it, its all guess work. __________________ Its not pretty but its mine to figure out. The build / The Photos / Build Diary

09-18-2008, 10:09 AM	#3
MikeN Registered User Join Date: Oct 2007 Location: Marietta, GA Posts: 805	Re: What gear ratio did the manual trans inline -six come with??? 95% of them seem to be 3.73's

09-18-2008, 10:16 AM	#4
jkaylor68gmc Senior Member Join Date: Dec 2005 Location: TN Posts: 2,448	Re: What gear ratio did the manual trans inline -six come with??? man, it seems like mine is a 4:11, It may have a 3:73, can't you turn the drivesahft and count how many times the wheel turns? __________________ 1947 International KB-1 1957 Chevy Bel-Air riding low 1962 swb fleetside 2002 Chevrolet Silverado 7-inch lift on 35 Daily driver 2016 Chevy Tahoe Better halves ride

09-22-2008, 12:43 AM	#5
justcuz Registered User Join Date: May 2008 Location: Alta Loma, Ca. Posts: 930	Re: What gear ratio did the manual trans inline -six come with??? You can pull the cover and change the fluid. When you do that the R&P numbers will be stamped in the ring gear. Divide the little number into the big number and it will tell you the ratio.

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