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3.20 or 2.83

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3.20 or 2.83

Post #1 by Ashley47 » Fri Oct 26, 2018 6:32 am

I have a NOS 3.20 gear set that I’m contemplating putting into my differential rebuild which was previously a 3 Spd but now a C4.

I understand that C4’s usually had 2,83 (for 66 mustangs).

For a cruiser and occasional freeway runner is a 3.20 the wrong gear set for a 200 6 Cylinder with a C4.

Just want a quiet runner, not looking for explosive performance. I’m as old as my car so I know the strain.

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Re: 3.20 or 2.83

Post #2 by 62Cometman » Fri Oct 26, 2018 9:49 am

As everyone here likes to ask, what is the final intended purpose of the vehicle? Is it mostly in town drive with limited hwy use? or it is something you want to take cross state or on longer trips? If you are only ever going to do in town driving with sparse use on the hwy 3.20 would be the better of the two, but for the longer higher speed drives the 2.83 shines without really revving the engine to the sky. The auto cars did often come with the 2.83 and having done this swap myself (from 3.20 to 2.83) it made not only a slightly noticeable performance decrease at low speed, but it also made a noticeable driveability increase at hwy speeds. Personally i like the 2.83, but i have a 4 speed so it splits the gear pretty nicely and performance isnt nearly as bad as if i had left the 3 speed or perhaps the autos.
1962 Mercury Comet 170 ci, Dagenham Trans, 2.83:1 7.25 rear.
She ain't fast but she's fun. 8)

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