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Old 05-30-2005, 12:00 AM
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2.73 rear end

Hello Everyone,

Actually, I opened my diff. and found out that it's a 2.73.
Now, I have a th 350 and 383 engine. I also have traction bars and brand new polyeurethane bushings and mounts.

Is this a good ratio for me? Or should I change it?
And can some body tell me what will happen when the ratio goes higher?

I was thinking that I have a 3.73, but it turned out to be 2.73.
Anyway, which is better with my setup?

I need more accelreation and qarter mile time than top speed.

Thanks,
Houman SS '70

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Old 05-30-2005, 12:50 AM
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if you went to all the trouble of getting the bushings and the trac bars, and are interested in 1/4 mile times and acceleration, you should have the 3.73's. I have the same 2.73 in my th350/383 setup right now. The 383 will cook the tires (posi) with the 2.73's, but I know I could get a lot more out of my investment if I let it wind up faster with a set of 3.73's. I think you're right on the money with those trac bars, though, I wouldn't even think about doing 3.73's without some traction assist!

K
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Old 05-30-2005, 01:25 AM
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You know, I'm outa cash now.
I've been spending so much during past 4 months for this car.
This is the last piece left maybe.

So 2.73 will burn the tires? So, you think that I'll be wasting a lot with this rear end? I have posi as well.

Now, do you think that I can get along with it a couple of months? Then I can buy a second hand rear from the scraps here. It's not that expensive.

So you are saying the higer the ratio, the less tire cook?
And higher ratio means higher speed or higher acceleration?

Thanks,
Houman
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Old 05-30-2005, 07:38 AM
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Gears are funny that way. 2:73 is higher than 3:73.
With your 2:73 you will cruising nicely on the highway at lower rpm, but won't have as much out of the hole.
With a set of 3:73, you will have alot more torque out of the hole, but higher rpm on the highway when cruising.
Sounds like time is more important than economy for you so you want the LOWER 3:73 gears.
Your 2:73 will do fine until you get some cash for the 3:73.

I believe I have this right, anyone correct me if I'm wrong.
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Old 05-30-2005, 08:38 AM
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yeah i've had my 2.73's behind my 383 for about a year now too. If you don't have the cash, you don't have it! Don't worry about it for now, the 2.73's will work fine.

Yes, my car will roast my tires with 2.73's. The motor has a lot of power (and a 2500 stall converter, which helps toward that end) but really roasting tires is just a sign of my poorly setup chassis and the hard old tires on the back! I have a set of trac bars sitting right next to me right now waiting to go on, and tires and bushings are in the future.

Burning tires is fun, but it doesn't get you a very good '60 time!

K
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Old 05-30-2005, 09:45 AM
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I agree with killer on this, one thing though...

what rear end do you have?
Is it posi or non posi?

Reason being that going from 2.73 to 3.73 for some rears would kill them. The 8.2 rear in cheavy or 7.5 both might have touble holding together behind a good engine.
The 8.5 rear or 12 bolt would be fine.
Another thing is that while running an non posi rear your 60 foot times will suffer but it really won't matter right now not until you get the money. Your heading in the right direction with the traction bars but remember when you stop the tires from spinning that extra power is being taken up somewhere in the drivetrain and that could mean breakage.
It is just a thought but make sure everything is in good order. As for now though save the money and ENJOY!

Chris
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