Axle Ratio & Identification

Axle ratio is stamped on bottom of carrier. See Fig 1 . A 3-letter axle code, which may be necessary for ordering parts, can also be found on differential. See AXLE RATIO IDENTIFICATION table.

AXLE RATIO IDENTIFICATION

Application

Teeth Ring Gear/Pinion

RPO Code

Axle Code

7 7/8" Ring Gear ⁽¹⁾

2.59:1

44/17

GM1

CQT

3.07:1

43/14

G44

CQW

8 1/2" Ring Gear ⁽²⁾

3.33:1

40/12

GT7

CQY

3.45:1

38/11

GM3

CQR

⁽¹⁾	Model 36, which is used on automatic transmissions only. Cover bushing color is Blue.

⁽²⁾	Model 44, which is used on manual transmissions only. Cover bushing color is Black.

Fig 1: Identifying Differential Assembly

Courtesy of GENERAL MOTORS CORP.