Countershaft & Constant Mesh Gears for Volvo I-Shift Transmissions
Quick Answer: Volvo I-Shift countershaft, constant mesh and input shaft constant gears for AT/ATO and VT gearboxes.
Countershaft & Constant Mesh Gears — part numbers and interchange data
5 part numbers in this section, each matched to the gearbox families listed. Send your OEM number, gearbox identification tag and quantity for a firm quotation.
Cross-reference compiled and verified against standard European aftermarket catalogs (CEI, Euroricambi / AM Gears, Wabco) and OEM part number supersessions. The source column opens the corresponding catalog entry for each part number.
| Part Name (EN) | OEM No. | Interchange / Supersessions | Aftermarket Refs | Compatible Gearbox Models | Specs | Source | Quote |
|---|---|---|---|---|---|---|---|
| Countershaft 3rd Speed Gear | 20483434 |
20366990, 7420483434 | CEI 146.679 | Euroricambi 88530719 | AM Gears 65328 | Volvo I-Shift AT2412C/D/F, AT2512C, AT2612D/E/F, AT2812C/D/F | 39 Teeth (Z=39) | 20CrMnTi Carburized Alloy Steel | catalog | View part |
| Constant Mesh Gear Z=44 | 20854437 |
1521422, 7420854437 | CEI 146.564 | Volvo I-Shift (AT2412C, AT2512C) & VT/VTO Manual Series | 44 Teeth (Z=44) | 20CrMnTi Carburized Alloy Steel | catalog | View part |
| Countershaft 2nd Speed Gear | 20544781 |
22219353, 20544783 | Gen-F: 22560442 | CEI 146.680 | Euroricambi 88531065 | AM Gears 65331 | Volvo I-Shift AT2412C/D, AT2512C, AT2612D, AT2812C, ATO2512C | 28 Teeth (Z=28) | 20CrMnTi Carburized Alloy Steel | catalog | View part |
| Countershaft (Z=12/19) | 20544785 / 20544787 |
11544787 | Gen-F: 22763327 | Euroricambi 88530718 | PAI 806912 / 806913 | ZF 0073 301 014 | Volvo I-Shift AT2412C/D, AT2512C, AT2612D/E & Mack mDRIVE | One-Piece Forged Countershaft Z=12/19 | 20CrMnTi Carburized | catalog | View part |
| Input Shaft Constant Mesh Gear (Z=31) | 20776783 |
7420776783 | CEI 145.782 | PAI 806852 | Volvo I-Shift (AT2412C, AT2512C, AT2612F) & VT/VTO Series | 31 Teeth (Z=31) | 20CrMnTi Carburized Alloy Steel | catalog | View part |
How to order Volvo I-Shift parts from Volgen Power
Three steps, no account required.
- Send the OEM number printed on the part or on the gearbox identification plate (AT2412 / AT2612 / ATO2612 / SPO2812 series).
- We confirm the fitment against the compatible model list and the supersession chain shown above.
- Receive a quotation with wholesale pricing, packing and lead time, usually within one working day.
Frequently asked questions
- Are these parts interchangeable with Gen F (AT2612F) gearboxes?
- Each row shows the applicable supersession numbers. Where a Gen F number exists it is listed in the Interchange column — confirm your gearbox identification plate before ordering.
- Do you supply both C/D generation and F generation countershaft brake components?
- Yes. C/D-line and F-line kits are separate part numbers and appear as separate rows; they are not interchangeable.
- What information do you need for an accurate quotation?
- The OEM number, the gearbox model code and the quantity. A photo of the identification plate is the fastest route.
Request a quote
Send your OEM numbers, gearbox model code and quantities. We reply with pricing, packing and lead time.
