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what rear end gears should i use?

I love my Chevy Chevette!
Posts: 6
Joined: 03/14
Posted: 03/06/14 07:46 AM

i have a 79 camaro with a small block 400 in it pretty much stock only mods are edelbrock performer rpm intake edelbrock 650 carb headers and getting a cam soon its a LUNATI 10001LK SBC HYD 280/290 .443/.465 112/107 CAM. i want to have good take off and decent top end too. i have a th400 tranny in it. any suggestion on a good rear end gear ratio? Oh and the converter is stock.  

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Big Block power for the win
Posts: 868
Joined: 12/11
Posted: 04/14/14 10:41 AM

3.42, if you can afford more Gas, 3.73 more than that in a street car Makes me Cringe as I see the Dollar bills flying out the Window.  

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V-6 Camaros rule!
Posts: 67
Joined: 01/14
Posted: 04/14/14 05:55 PM


unfortunately i would not use that cam. your engine has around 3:1 compression [maybe slightly higher] and the heads flow less air in a minute than a lung cancer patient breathes in a day, lol.

it might also pull your rocker studs out.

i would fet heads that get my compression up to around 9.5 and pocket port the heads st least.  

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I mow my lawn and find Chevys
Posts: 2253
Joined: 07/08
Posted: 04/14/14 06:00 PM

Big gears on the street are a real pain unless you have an overdrive trans which the 400 is not. The 3.42s as suggested would be as high as I would go unless you plan to spend a lot of time at the track.  

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I love my Chevy Chevette!
Posts: 14
Joined: 01/14
Posted: 08/12/14 08:13 PM

My 66 malibu has a drivetrain combo of a mildly modified 350ci, TH350, and the biggest mistake we ever made.... Put in an Eaton Posi with 4.11 gears. This thing is a tire melting beast now and redlight savage, BUT I don't touch the hwy with it anymore. Rpm's are through the roof above 55mph and fuel consumption breaks the bank. Needless to say we are saving up now to upgrade the transmission a gear or two. Having made the mistake already I would put my money in the 3.43 gears as suggested by others if I was doing it again. Save myself from this snowball affect. On a side note I think you would have to change to a stall converter with that cam, but not 100% on that.  

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