rearend question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rickey · 07-30-2007, 04:50 PM

I got a 12 bolt rearend to day, so I can rebuild mine and keep driving it. The ring gear had 11-41 on it what ratio is this.

Blazer1970 · 07-30-2007, 05:00 PM

3.73

70GMCer · 07-30-2007, 05:42 PM

msgross · 07-30-2007, 06:05 PM

yep... just divide 41 by 11 and you get 3.72727272... which rounds up to 3.73

Rickey · 07-30-2007, 08:11 PM

Thanks, I will remember that for next time.

'68 longbed · 07-30-2007, 09:50 PM

at the risk of hijacking the thread, what do ya'll recommend for a good ratio for good streetability/milage/highways speeds?

mine is a 350, with 3 speed 68 stepper. currently 60 mph is about 3grand on a tach. I'd much rather see somthing in the low 2grand area at 75 ish mph.

GREASEMONKEY72 · 07-30-2007, 09:56 PM

Quote:

Originally Posted by '68 longbed

at the risk of hijacking the thread, what do ya'll recommend for a good ratio for good streetability/milage/highways speeds?

mine is a 350, with 3 speed 68 stepper. currently 60 mph is about 3grand on a tach. I'd much rather see somthing in the low 2grand area at 75 ish mph.

pop in a 3.07 and itll be better, IIRC mine is around 2400 at 55mph

'68 longbed · 07-30-2007, 10:03 PM

thanks! I had a shop try to tell me 3:43 would the perfect ratio.....still seems low to me. I hear 2:73 is ok but probably too high

07-30-2007, 04:50 PM	#1
Rickey Registered User Join Date: Jun 2007 Location: Kaufman TX Posts: 160	rearend question I got a 12 bolt rearend to day, so I can rebuild mine and keep driving it. The ring gear had 11-41 on it what ratio is this.

07-30-2007, 05:00 PM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	Re: rearend question 3.73 __________________ Tim

07-30-2007, 05:42 PM	#3
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: rearend question __________________ 1997 GMC Sierra Ext 1965 Mustang

07-30-2007, 06:05 PM	#4
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: rearend question yep... just divide 41 by 11 and you get 3.72727272... which rounds up to 3.73 __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

07-30-2007, 08:11 PM	#5
Rickey Registered User Join Date: Jun 2007 Location: Kaufman TX Posts: 160	Re: rearend question Thanks, I will remember that for next time.

07-30-2007, 09:50 PM	#6
'68 longbed Registered User Join Date: Jun 2007 Location: mississippi Posts: 181	Re: rearend question at the risk of hijacking the thread, what do ya'll recommend for a good ratio for good streetability/milage/highways speeds? mine is a 350, with 3 speed 68 stepper. currently 60 mph is about 3grand on a tach. I'd much rather see somthing in the low 2grand area at 75 ish mph. __________________ "spiiiider pig, spiiiiider pig, does whatever spiiiider pig does. "

07-30-2007, 10:03 PM	#8
'68 longbed Registered User Join Date: Jun 2007 Location: mississippi Posts: 181	Re: rearend question thanks! I had a shop try to tell me 3:43 would the perfect ratio.....still seems low to me. I hear 2:73 is ok but probably too high __________________ "spiiiider pig, spiiiiider pig, does whatever spiiiider pig does. "



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