Rear End Confusion

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May 31, 2011 | 11:25 PM

Dillonj

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From: Quincy IL

Rear End Confusion

I have read in the owner's manual that the C4 has like a 3.06 rear end or something, but i read in a couple books it has a 2.73 (i cant remember exactly)

does anyone know what the actual ratio is on an 84 base corvette?
i would like to drop in a cam but if the ratio is that high i need to get a smaller one than i wouild like to (looking for a touch of lope)

May 31, 2011 | 11:28 PM

87 vette 81 big girl

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Quote:

Originally Posted by Dillonj

Either 2.73 or 3.07 on your 84 Vette.

Check storage compartment folding door for the broadcast code white label attached.

The rear gear ratio code will be there coded.

On 86 & late C4 verts, the white label of codes is on the console door underside.

BR

May 31, 2011 | 11:30 PM

Dillonj

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From: Quincy IL

will do, thank you

May 31, 2011 | 11:33 PM

87 vette 81 big girl

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Your welcome.

You can research all codes here on C4 using the search function.

Or you can call your local GM Dealership & ask for the parts guy.
They can decipher all codes over the telephone with you.

BR

May 31, 2011 | 11:38 PM

Black89Z51

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From: Newport News Virginia

From the FAQ:

G44 - 3.07 Rear Axle Ratio
G87 - ring gear 8.50 inch
G92 - Performance Axle Ratio
GHO - 3.54 axle ratio
GM1 - 2.59 Rear Axle Ratio
GM3 - 3.45 Rear Axle Ratio (8.5 in. Ring Gear)
GT7 - 3.33 rear axle ratio
GU2 - 2.73 Rear Axle Ratio

G44 - 3.07 Rear Axle Ratio - D36, optional; D44, standard, pre-1992.
G92 - Performance Axle Ratio - Shows performance axle selected.
GHO - 3.54 axle ratio - D44 only.
GM1 - 2.59 Rear Axle Ratio - D36 only.
GM3 - 3.45 Rear Axle Ratio - D44 only.
GU2 - 2.73 Rear Axle Ratio - D36 only.

May 31, 2011 | 11:41 PM

Dillonj

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From: Quincy IL

note to self, check FAQ's

thanks you two

May 31, 2011 | 11:42 PM

87 vette 81 big girl

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Quote:

Originally Posted by Black89Z51

Book Marked on my Computer.

Jun 1, 2011 | 02:50 AM

rodj

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From: Australia

Quote:

Originally Posted by Dillonj

I have read in the owner's manual that the C4 has like a 3.06 rear end or something,

All '84's ( regardless of trans type ) came with a 3.07 rear except for 410 manual cars that were fitted with a ultra rare 3.31 ratio.
There was no optional ratio available for auto cars in '84
In later years ;
2.59 was the base ratio for autos ( 2.73 in verts ) and 3.07 was the optional RPO G92 " performance ratio" for autos

A D36 was the only diff fitted in '84 ,the heavier D44 (RPO G87 ) came with manual cars '85 - '96

Last edited by rodj; Jun 1, 2011 at 03:01 AM.