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Differential
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Alex
Posted 2019-04-28 7:46 PM (#581466)
Subject: Differential


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Location: Victoria Australia
Hi Guys, anyone know were I can get a standard 3.00 ratio crown and pinion for a 1961 Chrysler Newport sedan please?

Thanks.

Edited by Alex 2019-04-28 8:07 PM
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58coupe
Posted 2019-04-28 9:20 PM (#581469 - in reply to #581466)
Subject: Re: Differential



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Location: Alaska
Is this for a Chrysler built 8 3/4? The closest ratio I have seen listed for it is 2.94
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Alex
Posted 2019-04-30 2:23 AM (#581555 - in reply to #581466)
Subject: RE: Differential


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Location: Victoria Australia
Thanks.
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ABloch
Posted 2019-04-30 10:10 AM (#581563 - in reply to #581466)
Subject: Re: Differential



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What are your shipping options? Can you buy from the big parts suppliers in the States? (pretty sure you can, but will they ship it to you?) Summit has this. Would work pretty darn good.

https://www.summitracing.com/search/department/transmission-drivetra...
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57chizler
Posted 2019-04-30 3:04 PM (#581576 - in reply to #581563)
Subject: Re: Differential



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Doctor Diff has better prices but availability depends on what housing you have.

https://www.doctordiff.com/8-3-4-ring-and-pinion.html
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ABloch
Posted 2019-04-30 6:24 PM (#581583 - in reply to #581466)
Subject: Re: Differential



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Much better pricing!
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Alex
Posted 2019-05-01 7:29 AM (#581604 - in reply to #581466)
Subject: Re: Differential


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Posts: 206
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Location: Victoria Australia
The diff specialist says my diff has a ratio of 3.00.1
Says he has a crown and pinion at a ratio of 3.1?.1
Was hopeing to keep it as was but from the info I have received it does not look like the original ratio is available.
Will ask him for the price of his and also take a better look at the housing to determine which is it that I have.
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58coupe
Posted 2019-05-01 10:31 AM (#581615 - in reply to #581466)
Subject: Re: Differential



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What are the numbers cast into the housing? they might end in 657 or 741 if an open rear or 742 if limited slip. The pinion size is different depending on which one, 1 3/8" if open and 1 3/4" if limited slip.
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Alex
Posted 2019-05-01 12:28 PM (#581626 - in reply to #581466)
Subject: Re: Differential


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Posts: 206
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Location: Victoria Australia
On nightshift at moment but will check when able.
Have checked specs for the Newport and the ratio should be 2.93. Close to the 2.94 you mentioned earlier.
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57chizler
Posted 2019-05-01 2:25 PM (#581635 - in reply to #581604)
Subject: Re: Differential



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Alex - 2019-05-01 4:29 AM

The diff specialist says my diff has a ratio of 3.00.1
Says he has a crown and pinion at a ratio of 3.1?.1


No 3.00 ever available in an 8 3/4" but there was a 3.18 in the fifties, probably a good choice.
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Powerflite
Posted 2019-05-01 7:47 PM (#581645 - in reply to #581466)
Subject: Re: Differential



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There was also a 3.15:1 in the early days of the 8 3/4. In the states, it is usually cheaper to just get a used third member with the gear ratio you want in it. I've never had issues running a *clean* used chunk.
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58coupe
Posted 2019-05-02 8:22 AM (#581664 - in reply to #581466)
Subject: Re: Differential



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Alex, I was working from memory. The ratio may be 2.93 not 2.94 any way ,I have one in limited slip but plan on using it, sorry. There was also a ratio around 2.73 which would be great for cruising.
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Alex
Posted 2019-05-02 10:33 AM (#581672 - in reply to #581466)
Subject: Re: Differential


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Posts: 206
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Location: Victoria Australia
Not a problem 58 coupe, thanks anyway. Ok, mine is a 8 3/4, not sure on case yet and 2.93 ratio. He has a good second 3.23 from a Plymoth which he wants to put in.
Would I notice much difference going from a 2.93 to a 3.23 on the road?
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ABloch
Posted 2019-05-02 12:00 PM (#581674 - in reply to #581466)
Subject: Re: Differential



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Short answer is no. You might notice a little more get up and go from a start and the gas mileage will suffer, ever so slightly on long distance hiway rides. The engine will be working a bit harder the faster you go. Someone here can do the math for you, im sure. Depending on your tires size lets say your engine was spinning 2200 rpms @ 60mph. The 3:23 will be making the engine spin around 2400rpms @ 60mph. (This is just an example and no math was made)
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57chizler
Posted 2019-05-02 12:20 PM (#581675 - in reply to #581664)
Subject: Re: Differential



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58coupe - 2019-05-02 5:22 AM

Alex, I was working from memory. The ratio may be 2.93 not 2.94


Both ratios were used in the 8 3/4"; 2.93 is earlier with a 41-14 tooth count while 2.94 is later with a 47-16 tooth count.
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Alex
Posted 2019-05-02 2:49 PM (#581683 - in reply to #581466)
Subject: Re: Differential


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Posts: 206
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Location: Victoria Australia
I do a lot of highway driving but looks like I might have to go with his 3.23 as I cannot find a 2.93 or 2.94.
Thankyou to you guys for the info and help, much appriciate it.
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