1949-52 Olds rear ends. Looking for 3.23

idaholc · April 13th, 2009, 02:22 PM

I have a 1949 Olds Coupe with a built 425 Olds and a 700R. The Stock '49 rear end has 3.64 gears. At 75mph I am turning 2378 rpm. I would like to install 3.23 gears for 2110 rpm at 75mph and better MPG. Is there a point of diminishing returns on rear end gearing and cruising fuel efficiency? Does anyone have a set of 3.23's?

idaholc · April 13th, 2009, 02:37 PM

The 3.64 gears I have have a 40 tooth ring gear and 11 tooth pinion, thus 3.64 ratio. The 3.23 gears I am looking for has 42 tooth ring gear and 13 tooth pinion, thus 3.23 ration.

Question, could I mate a 13 tooth pinion gear to the existing 40 tooth ring gear and get a 3.08?

monzaz · April 14th, 2009, 09:10 AM

I have a 3.42 complete center section...actually the whole rear if you need axles and or backing plates you might want to get extras if you need.

I can send pictures of the rear if you are interested...yes, I can and will ship to you also.

I think about 65-70 pounds fed ex ground would be- about 45-50 dollars to ship

idaholc · April 14th, 2009, 11:13 AM

I am shooting or at least a 3.23 if I am going to the trouble of changing. they were only found in 1949 88's. Thanks anyway.

jaysun · April 14th, 2009, 11:17 AM

Gleason hypoid generator? does that take 1.21 gigawatts to operate?

sorry i'll be quiet now.

Jason

jaysun · April 15th, 2009, 08:44 AM

There always something to learn.thanks CW

idaholc · April 16th, 2009, 10:37 AM

thanks for your help. I found a 3.23 gear set locally, so no shipping costs. Now I will soon have a set of 3.64's available.

idaholc · April 16th, 2009, 10:39 AM

By the way you guys, I have acquired a list of all 1949 and 1950 Olds rear end
ratios and what models they came in, in case anyone is interested. I could pass it along.

mo381 · October 16th, 2009, 07:10 PM

I would be interested in learning about the rear end in my 51 Super 88. Any info would be helpful.
Thanks

April 13th, 2009, 02:22 PM	#1 (permalink)
idaholc Registered User Join Date: Dec 2008 Location: Boise, Idaho Posts: 15	1949-52 Olds rear ends. Looking for 3.23 I have a 1949 Olds Coupe with a built 425 Olds and a 700R. The Stock '49 rear end has 3.64 gears. At 75mph I am turning 2378 rpm. I would like to install 3.23 gears for 2110 rpm at 75mph and better MPG. Is there a point of diminishing returns on rear end gearing and cruising fuel efficiency? Does anyone have a set of 3.23's?

April 13th, 2009, 02:37 PM	#2 (permalink)
idaholc Registered User Join Date: Dec 2008 Location: Boise, Idaho Posts: 15	Matching ring and pinion The 3.64 gears I have have a 40 tooth ring gear and 11 tooth pinion, thus 3.64 ratio. The 3.23 gears I am looking for has 42 tooth ring gear and 13 tooth pinion, thus 3.23 ration. Question, could I mate a 13 tooth pinion gear to the existing 40 tooth ring gear and get a 3.08?

April 14th, 2009, 09:10 AM	#3 (permalink)
monzaz Registered User Join Date: Jul 2006 Location: Richfield, Oh Posts: 209	rear diff 1949-1950 I have a 3.42 complete center section...actually the whole rear if you need axles and or backing plates you might want to get extras if you need. I can send pictures of the rear if you are interested...yes, I can and will ship to you also. I think about 65-70 pounds fed ex ground would be- about 45-50 dollars to ship

April 16th, 2009, 10:37 AM	#7 (permalink)
idaholc Registered User Join Date: Dec 2008 Location: Boise, Idaho Posts: 15	3.23 found thanks for your help. I found a 3.23 gear set locally, so no shipping costs. Now I will soon have a set of 3.64's available.

April 16th, 2009, 10:39 AM	#8 (permalink)
idaholc Registered User Join Date: Dec 2008 Location: Boise, Idaho Posts: 15	1949 50 Olds Gear ratio chart By the way you guys, I have acquired a list of all 1949 and 1950 Olds rear end ratios and what models they came in, in case anyone is interested. I could pass it along.

April 14th, 2009, 11:13 AM	#4 (permalink)
idaholc Registered User Join Date: Dec 2008 Location: Boise, Idaho Posts: 15	I am shooting or at least a 3.23 if I am going to the trouble of changing. they were only found in 1949 88's. Thanks anyway.

April 14th, 2009, 11:17 AM	#5 (permalink)
jaysun ate glue as a child Join Date: Feb 2009 Location: madison wi Posts: 75	Gleason hypoid generator? does that take 1.21 gigawatts to operate? sorry i'll be quiet now. Jason

April 15th, 2009, 08:44 AM	#6 (permalink)
jaysun ate glue as a child Join Date: Feb 2009 Location: madison wi Posts: 75	There always something to learn.thanks CW

October 16th, 2009, 07:10 PM	#9 (permalink)
mo381 Registered User Join Date: Sep 2009 Location: Indiana Posts: 6	I would be interested in learning about the rear end in my 51 Super 88. Any info would be helpful. Thanks

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
1949 Olds Rocket 88 Coupe	peacefrog5	Eighty-Eight	19	November 10th, 2009 06:31 PM
1949-50 Olds 76. 88 rear seat	buhog	Parts For Sale	0	January 10th, 2009 03:29 PM
1949 Olds 88 Value	JD in CA	General Discussion	5	December 12th, 2008 09:53 AM
3 rear ends....$200 bucks. Buy them?	J-(Chicago)	Drivetrain/Differentials	4	December 11th, 2007 08:08 PM
Rear Ends 101	Olds64	Drivetrain/Differentials	4	September 25th, 2007 09:19 PM