Ring gear size

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May 20, 2001 | 01:34 PM

bigdaddy

Thread Starter

Junior Member

Joined: Sep 2000

Posts: 20

Likes: 0

From: magnolia, tx. usa

Ring gear size

I need to know what size ring rear I have in my 1987 Trans Am GTA. Is it a 7 1/2? Same as a Camaro? It has the rubber plug in the back cover to fill. It is also stamped 3.21 ratio and not 3.27 the way everybody says they have. Also will I have to have an adapter plate to install a 4.10 or 4.11 ring and pinion?

May 20, 2001 | 03:04 PM

82camaro

Supreme Member

Joined: Nov 1999

Posts: 2,860

Likes: 3

From: NE

Car: 82 camaro SC

Engine: 350

Transmission: 700r4

If it has the rubber plug, it's a 7.75 inch 9 bolt. Good luck finding parts.

------------------
82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

May 20, 2001 | 10:52 PM

jaretz28

Member

Joined: Jun 2000

Posts: 152

Likes: 0

If ya go a nine bolt, and what to ever change gears...change the whole rearend cause 3.73 and 4.10 gears are upwards of 400 - 600 buckS !!!! That's if you are lucky enough to find them.

May 21, 2001 | 12:45 PM

88 427 Camaro

Senior Member

Joined: Jul 1999

Posts: 931

Likes: 0

From: Mpls, MN USA

Car: 88 Camaro

Engine: 427 BBC

Transmission: T400

Not sure about the 3.21 ratio, but it sounds like a 9 bolt to me. Pull the diff cover and see what is says on the side of the ring gear.

Miles

------------------
88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES,it is a 9 bolt & YES they are 3.73's, not 3.70. 4.11's to follow soon