4 Volvo I-Shift Transmission
VOLVO I-SHIFT TRANSMISSION
GENERAL INFORMATION
The Volvo I-Shift transmission is a single countershaft transmission with 12
forward gears and two reverse gears. Some vehicles have four reverse gears.
The I-Shift is an automated mechanical transmission. The transmitted torque
(both engine and braking) will be interrupted during gear shifting, in both
driving and coasting conditions. There is no clutch pedal and the gearshift is
controlled by the ergonomic gear selector. The I-Shift is available as an
overdrive or direct drive transmission.
Nomenclature and Ratios
The I-Shift transmission is available in four configurations:
앫 AT2512C – Direct Drive for Volvo D11 and D13 Engines
앫 ATO2512C – Overdrive for Volvo D11 and D13 Engines
앫 AT2812C – Direct Drive for Volvo D16 Engine
앫 ATO3112C – Overdrive for Volvo D16 Engine
NOMENCLATURE
AT O XX 12 C
Automated
Mechanical
Transmission
O = Overdrive
No Letter = Direct
Drive
Maximum Input
Torque Nm (lb-ft)
25 = 2500 (1850)
28 = 2800 (2050)
31 = 3100 (2300)
Forward
Speeds
Design
Level
GEAR RATIOS
Gear Selection AT2512C and AT2812C
ATO2512C and
ATO3112C
1st 14.94:1 11.73:1
2nd 11.73:1 9.21:1
3rd 9.04:1 7.09:1
4th 7.09:1 5.57:1
5th 5.54:1 4.35:1
6th 4.35:1 3.41:1
7th 3.44:1 2.70:1
8th 2.70:1 2.12:1
9th 2.08:1 1.63:1
10th 1.63:1 1.28:1
11th 1.27:1 1.00:1
12th 1.00:1 0.78:1
Reverse Gear R1 17.48:1 13.73:1
Reverse Gear R2 13.73:1 10.78:1
Reverse Gear R3 4.02:1 3.16:1
Reverse Gear R4 3.16:1 2.48:1
usa22983Final.fm Page 4 Tuesday, March 6, 2007 8:21 AM
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