Std. equip. gear ratio for 307, 3 spd stick.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bagged91 · 02-05-2004, 11:51 PM

What would be the standard equipment gear ratio found in a 71' C10 with a 307 & 3 speed manual transmission? Just for curiosity sake, how well do these stock 12 bolts hold up to a mild bigblock(.030 454).....

Thanks - Joe

lukecp · 02-06-2004, 12:09 AM

It would have been a 3.73 ratio, unless noted otherwise on the glovebox.

12-bolts are a tough rear, when they don't have half a million miles on them. They came from the factory with stock 454's and 396's infront of them.

02-05-2004, 11:51 PM	#1
bagged91 Out draggin' Join Date: Jan 2004 Location: Pitman,NJ Posts: 1,574	Std. equip. gear ratio for 307, 3 spd stick.... What would be the standard equipment gear ratio found in a 71' C10 with a 307 & 3 speed manual transmission? Just for curiosity sake, how well do these stock 12 bolts hold up to a mild bigblock(.030 454)..... Thanks - Joe __________________ 91 GMC Xcab LB-Bags/bd/caddy clip SOLD 72 C10 Cheyenne Super LWB SOLD 92 GMC K1500 Burb 72 C10 Burb (ex. Cheesewagon)SOLD 72 C20 Burb parts truck 71 C10 Burb "project"

02-06-2004, 12:09 AM	#2
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	It would have been a 3.73 ratio, unless noted otherwise on the glovebox. 12-bolts are a tough rear, when they don't have half a million miles on them. They came from the factory with stock 454's and 396's infront of them. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg



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