stock rear end

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12-14-2007, 06:57 PM

America ftw

Thread Starter

Join Date: Feb 2007

Location: ca

Posts: 2,261

stock rear end

what is the gear ratio for a stock 66 289 8 inch rear end? im building my motor and we need to know what my gear ratio is in order to determine what cam im going with.

12-14-2007, 08:36 PM

cmanf

3rd Gear Member

Join Date: Dec 2006

Location:

Posts: 815

RE: stock rear end

Ill say 280 open dif non posi.
4 out of 5 ive had were that set up from the factory.

12-14-2007, 09:59 PM

andrewmp6

6th Gear Member

Join Date: Oct 2006

Location:

Posts: 8,162

RE: stock rear end

Crawl under the car look on the pumkin there will be a small metal tag, With some numbers and letters give me that ill tell you what it is.

12-15-2007, 03:34 AM

theAutomatics

1st Gear Member

Join Date: Apr 2007

Location: Midwest, USA

Posts: 69

RE: stock rear end

I'll bet it's an 8" rear end with a high 2's for a gear. Who knows who owned the car before you though.

12-15-2007, 05:26 AM

jspagna1

3rd Gear Member

Join Date: Jan 2007

Location: CT

Posts: 940

RE: stock rear end

If it's the original stock rearend, the gear ratio is 2.79 . I have a 66 coupe with a C4and that's what originally came in mine. But you mention a cam? It really depends what direction your going with the car. Is it going to be a stocker, a Restomod, or a drag car? That is what you need to ask yourself.
I went the Restomod route so the 2.79's came out and I replaced them with 3.55's.I don't do a lot of highway driving with the car, but I do a lot of cruiseing,cruisenights & car shows occassionally. If you are going to do the same, I would go with anything between a 3.25 - 3.73(no more).

http://www.cardomain.com/ride/2576315

12-15-2007, 06:20 AM

bluovalguy

4th Gear Member

Join Date: Mar 2007

Location: Portland, OR

Posts: 1,747

RE: stock rear end

Quote:

ORIGINAL: cmanf

Ill say 280 open dif non posi.
4 out of 5 ive had were that set up from the factory.

+1. If it hasnt been modded, this is what you probably have.

12-15-2007, 03:36 PM

America ftw

Thread Starter

Join Date: Feb 2007

Location: ca

Posts: 2,261

RE: stock rear end

Quote:

ORIGINAL: jspagna1

If it's the original stock rearend, the gear ratio is 2.79 . I have a 66 coupe with a C4and that's what originally came in mine. But you mention a cam? It really depends what direction your going with the car. Is it going to be a stocker, a Restomod, or a drag car? That is what you need to ask yourself.
I went the Restomod route so the 2.79's came out and I replaced them with 3.55's.I don't do a lot of highway driving with the car, but I do a lot of cruiseing,cruisenights & car shows occassionally. If you are going to do the same, I would go with anything between a 3.25 - 3.73(no more).

http://www.cardomain.com/ride/2576315

yeah im thinking 3.73's for the street. the car WAS gonna be a restoMOD but now its gonna be more like a RESTOmod. i found out my 289 block had already been .040 over so its junk. so i have an untouched 302 block and heads and crank that im gonna use. the motor is gonna be stock ecxept for a mild hydraulic cam, headers, and edelbrock intake with a 650 DP street avenger. im expecting no more than 280-300hp MAX. nothing big.