Contact

GBOX LLC.

5757 Arapahoe Ave.

Unit # C1 East

Boulder CO, 80303

Phone: (303)-440-8899

mail@gboxweb.com

Hours:

Mon-Fri > 8am - 5pm MTN.

Sat-Sun > By Appointment.

915 TRANSAXLE SPECIFICATIONS

915 Transaxle

915 Race Ratios

From the Porsche factory publication for racing cars:

“Information regarding Porsche Vehicles Used for Sports Purposes”

1st gear: 3.08 (12/34)

1st gear: 2.64 (14/37)

1st gear: 2.40 (15/36)

1st gear: 2.21 (14/31)

2nd gear: 2.19 (16/35)

2nd gear: 2.06 (17/35)

2nd gear: 2.00 (15/30)

2nd gear: 1.93 (15/29)

2nd gear: 1.89 (18/34)

2nd gear: 1.68 (19/32)

2nd gear: 1.60 (20/32)

3rd gear: 1.60 (20/32)

3rd gear: 1.48 (21/31)

3rd gear: 1.43 (21/30)

3rd gear: 1.38 (21/29)

3rd gear: 1.32 (22/29)

4th gear: 1.23 (23/28)

4th gear: 1.17 (24/28)

4th gear: 1.08 (25/27)

4th gear: 1.04 (25/26)

4th gear: 1.00 (26/26)

4th gear: 0.93 (27/25)

4th gear: 0.89 (27/24)

4th gear: 0.79 (28/22)

4th gear: 0.76 (29/22)

5th gear: 1.04 (25/26)

5th gear: 1.00 (26/26)

5th gear: 0.93 (27/25)

5th gear: 0.89 (27/24)

5th gear: 0.86 (28/24)

5th gear: 0.82 (28/23)

5th gear: 0.79 (28/22)

Ring and pinion: 4.43 (7:31) or 5.29 (7:37)

915/02

911 1972-74

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 0.96 (26/25)

5th gear: 0.76 (29/22)

Ring and pinion: 4.43 (7:31)

915/06

911 1975

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 0.93 (27/25)

5th gear: 0.72 (29/21)

Ring and pinion: 4.43 (7:31)

915/08

911 Carrera RS 1973

5-speed synchronized transaxle w/tail-cover oil pump

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 0.93 (27/25)

5th gear: 0.72 (29/21)

Ring and pinion: 4.43 (7:31)

915/35

911 S/T 2.5L 1972

5-speed synchronized transaxle w/tail-cover oil pump

Manufactured by Porsche (ZF)

Plate-type limited-slip differential

Rod shift

Single-plate clutch

Gear ratios: see racing ratios

915/40

911S, Carrera (USA) 1975

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 1.00 (26/26)

5th gear: 0.82 (28/23)

Ring and pinion: 3.88 (8:31)

915/43

911 ROW 1975

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 0.96 (26/25)

5th gear: 0.72 (29/21)

Ring and pinion: 4.43 (7:31)

915/44

911, 911S (USA), Carrera 1976

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 1.00 (26/26)

5th gear: 0.82 (28/23)

Ring and pinion: 3.88 (8:31)

915/50

935 1.4L Turbo "Baby" 1977

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Rod shift

Single-plate clutch

Gear ratios: see racing ratios

915/60

911, 911S (USA), Carrera 1977

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 1.00 (26/26)

5th gear: 0.82 (28/23)

Ring and pinion: 3.88 (8:31)

915/61

911SC 1978-79

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 1.00 (26/26)

5th gear: 0.82 (28/23)

Ring and pinion: 3.88 (8:31)

915/62

911SC (ROW) 1980-83

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 1.00 (26/26)

5th gear: 0.79 (28/22)

Ring and pinion: 3.88 (8:31)

915/63

911SC (USA/Japan) 1980-83

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 1.00 (26/26)

5th gear: 0.82 (28/23)

Ring and pinion: 3.88 (8:31)

915/67

911 Carrera 3.2 (ROW) 1984-86

5-speed synchronized transaxle w/cooler

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 0.97 (29/28)

5th gear: 0.76 (38/29)

Ring and pinion: 3.88 (8:31)

915/68

911 Carrera 3.2 (USA/Japan) 1984-86

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 1.00 (26/26)

5th gear: 0.79 (38/30)

Ring and pinion: 3.88 (8:31)

915/69

911 Carrera 3.2 Turbo-look (ROW) 1984-86

5-speed synchronized transaxle w/cooler

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 0.97 (29/28)

5th gear: 0.76 (38/29)

Ring and pinion: 3.88 (8:31)

915/70

911 Carrera 3.2 Turbo-look (USA/Japan) 1984-86

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 1.00 (26/26)

5th gear: 0.79 (38/30)

Ring and pinion: 3.88 (8:31)

915/72

911 Carrera 3.2 Turbo-look (ROW) 1984-86

5-speed synchronized transaxle w/cooler

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 0.97 (29/28)

5th gear: 0.76 (38/29)

Ring and pinion: 3.88 (8:31)

915/73

911 Carrera 3.2 Turbo-look (USA/Japan) 1984-86

5-speed synchronized transaxle

Manufactured by Porsche (ZF)

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.18 (11/35)

2nd gear: 1.83 (18/33)

3rd gear: 1.26 (23/29)

4th gear: 1.00 (26/26)

5th gear: 0.79 (38/30)

Ring and pinion: 3.88 (8:31)