The Muncie A20 Series power take-off, part number A20-A1006-HX51XBX or A20A1006HX51XBX, is a medium-duty clutch shift PTO designed for Allison 3000 and 4000 Series automatic transmissions. The 10-bolt mounting pattern pairs with a shift cover that rotates a full 360 degrees, making installation routing straightforward in tight engine compartments. A rotatable pump flange and extended-length PTO mounting fasteners add further installation flexibility. Tapered roller bearings and an enlarged output shaft diameter extend service life, while a maximized gear profile reduces operating noise. The unit supports a single intermittent/continuous torque rating across three available housing arrangements and is compatible with the EX Drive shaft extension. Call us to confirm proper fit for your specific transmission and truck application.
Features
Clutch shift design for Allison 3000 and 4000 Series automatic transmissions
Shift cover allows 360-degree rotation for flexible installation routing
Rotatable pump flange and extended-length mounting fasteners ease installation
Tapered roller bearings and increased output shaft diameter for extended service life
Maximized gear profile engineered for reduced operating noise
Compatible with EX Drive shaft extension; available in three housing arrangements
Tech Specs
- Mounting: 10-bolt
- Shift type: Clutch shift
- Transmission application: Allison 3000 Series and Allison 4000 Series
- Shift cover rotation: 360 degrees
- Housing arrangements: Three
- EX Drive shaft extension compatibility: Yes
- Part number: A20-A1006-HX51XBX or A20A1006HX51XBX
Additional Information
| SPEED | 3000 SERIES | 4000 SERIES | INTERMITTENT CONTINUOUS HP (KW) | INTERMITTENT/CONTINOUS |
| RATIO | ENGINE % | ENGINE % | @ 1,000 RPM | TORQUE LBS.FT. (NM) |
| 5 | 74% | 105% | 77 (57) | 400 (542) |
| 6 | 85% | 122% | 77 (57) | 400 (542) |
| 7 | 99% | 141% | 79 (59) | 415 (563) |
| 8 | 114% | 163% | 69 (51) | 360 (488) |
| 9 | 122% | 175% | 65 (48) | 340 (461) |
| 10 | 131% | 187% | 59 (44) | 310 (420) |
| 11 | 151% | 215% | 52 (39) | 275 (373) |
| 12 | 162% | 231% | 50 (37) | 265 (359) |
| 15 | 201% | 287% | 39 (29) | 205 (278) |
