57 swb rear end ratio? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

la hi · 12-04-2011, 07:01 PM

I am trying to confirm my rear end ratio. The wheel turning method showed that 3.5 turns of the drive shaft to one turn of the tire.

I took the rear cover off for cleaning and oiling and I counted the gear teeth and the big wheel has 39 and the small wheel has 16.

I am not sure what rear end this is, however it has a smooth 9", 10 bolt cover.

Does anyone know what the ratio would be?
thanks,
larry

parkwood · 12-04-2011, 11:21 PM

3.50 gears????????

64swb · 12-05-2011, 11:25 PM

mathwise it calculates out to a 2.43 ratio which isn't uncommon for late 70's to early 80's 10 bolt rears, it usually showed up as 2.41 on spids/build sheets (in second gen camaros at least). so you either have that or counted teeth wrong.

OrrieG · 12-06-2011, 01:45 AM

The turn the tire method depends on which wheel you turn on an open rear end (no posi). You need jack up and turn the side that has the ring gear, usually the passenger side. But since you have it open the ring and pinion tell the whole story.

12-04-2011, 07:01 PM	#1
la hi Registered User Join Date: Oct 2011 Location: Pagosa Springs, CO Posts: 162	57 swb rear end ratio? I am trying to confirm my rear end ratio. The wheel turning method showed that 3.5 turns of the drive shaft to one turn of the tire. I took the rear cover off for cleaning and oiling and I counted the gear teeth and the big wheel has 39 and the small wheel has 16. I am not sure what rear end this is, however it has a smooth 9", 10 bolt cover. Does anyone know what the ratio would be? thanks, larry

12-04-2011, 11:21 PM	#2
parkwood Registered User Join Date: Jul 2011 Location: shingle springs, calif Posts: 771	Re: 57 swb rear end ratio? 3.50 gears????????

12-05-2011, 11:25 PM	#3
64swb Registered User Join Date: Mar 2007 Location: Camino, CA Posts: 182	Re: 57 swb rear end ratio? mathwise it calculates out to a 2.43 ratio which isn't uncommon for late 70's to early 80's 10 bolt rears, it usually showed up as 2.41 on spids/build sheets (in second gen camaros at least). so you either have that or counted teeth wrong. __________________ 1978 Chevy C10, 1986 Chevy K20 'Burb, 1970 Chevelle, 1996 K2500 'Burb, 1977 Chevy K10, 1970 Ford F-250, 72 Ford F100 4x4, 1979 Chevy C30, 1982 Chevy C30, 1996 Chevy Dually 4x4 SAS, 1997 Chevy Tahoe, 1991 Ford F-350 cclb dually 4x4

12-06-2011, 01:45 AM	#4
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: 57 swb rear end ratio? The turn the tire method depends on which wheel you turn on an open rear end (no posi). You need jack up and turn the side that has the ring gear, usually the passenger side. But since you have it open the ring and pinion tell the whole story. __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project



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