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63corvette · 03-16-2012, 05:44 PM

Just from my experience:
My old car was a 434 SBC and made almost 850 HP
Powerglide with 1.76 gears
Car weighed 2400 lbs plus without driver
Used 16- 32 inch tires
I started with 4.86 gears and that was a little low as it crossed the quarter mile at 7600 to 7800 RPM
I changed it to 4.56 gears
That did not change the quarter mile ET times but did change the MPH by a few more MPH.
I used the same torque converter. Only change was the rear end gears.
With the 4.56 gears it crossed the quarter mile finish line at 7200 to 7400 and ran high 8 second et's at close to 150 MPH.
Just my experience.
Rick Cates

03-16-2012, 05:44 PM	#9
63corvette Senior Member Join Date: Mar 2007 Location: Canyon, Tx Posts: 552 Likes: 128 Liked 357 Times in 103 Posts	Re: rear gear change Just from my experience: My old car was a 434 SBC and made almost 850 HP Powerglide with 1.76 gears Car weighed 2400 lbs plus without driver Used 16- 32 inch tires I started with 4.86 gears and that was a little low as it crossed the quarter mile at 7600 to 7800 RPM I changed it to 4.56 gears That did not change the quarter mile ET times but did change the MPH by a few more MPH. I used the same torque converter. Only change was the rear end gears. With the 4.56 gears it crossed the quarter mile finish line at 7200 to 7400 and ran high 8 second et's at close to 150 MPH. Just my experience. Rick Cates