Muncie A20A1008HX3PBPX is a medium-duty, 10-bolt clutch-shift PTO for compatible Allison 3000/4000 Series transmissions. Its PB direct-mount output combines an SAE B two- or four-bolt pump flange with a 1-inch, 15-tooth SAE BB spline. Select a hydraulic pump that matches both parts of that interface and the PTO's operating speed.
This ratio-08 configuration uses 0.84:1 internal gearing, HX 12 V electric/hydraulic shift, and arrangement 3 with the output on the left side and low. The PX option specifies Muncie's standard hose kit. The clutch engages an auxiliary drive on command; the hydraulic pump is selected separately.
Mount a compatible SAE BB pump
The rotatable pump flange provides 30 indexed positions for orientation around nearby chassis components. Confirm clearance for the pump body, fittings, and hoses in the selected position. A20 tapered roller bearings and rotatable shift cover are features of this PTO family, while the HX/PX activation package provides the switch and installation connections for this shift configuration.
| Feature |
Practical benefit |
| SAE BB 1-inch 15-tooth spline |
Matches a pump with the corresponding female input shaft. |
| SAE B two- or four-bolt flange |
Supports direct mounting of a pump with the matching SAE B pilot and bolt pattern. |
| Rotatable output flange |
Offers 30 indexed positions to help orient the pump within available clearance. |
| HX/PX installation package |
Provides the 12 V activation hardware and standard hose kit for this build. |
Technical specifications
| Specification |
A20A1008HX3PBPX |
| Manufacturer part number |
A20-A1008-HX3PBPX |
| Series and mounting |
A20 medium-duty clutch-shift PTO; Allison 10-bolt opening |
| Transmission input gear / ratio |
A10 for Allison 3000/4000 Series; ratio 08, 0.84:1 internal gearing |
| Output speed |
114% of engine speed for listed Allison 3000 applications; 163% for listed 4000 applications |
| Output rating |
360 lb-ft continuous and intermittent; 69 hp at 1,000 PTO rpm |
| Shift / arrangement |
HX 12 V electric/hydraulic; 3 left-side shaft-low |
| Output / hose option |
PB: SAE B two- or four-bolt flange with 1-inch 15-tooth SAE BB spline; PX: standard hose kit |
Applications and included components
Muncie's exact builder lists this configuration for an Allison 4000 Series EVS, RDS, SPS, or OFS application and specifies 163% of engine speed. The ratio-08 series rating for compatible Allison 3000 applications is 114%. Transmission model, build date, PTO opening, and chassis clearance determine whether this particular drive is appropriate.
| Component or application |
Selection detail |
| Allison 4000 Series |
Exact builder lists EVS, RDS, SPS, and OFS variants with a 10-bolt opening; verify the exact transmission. |
| Allison 3000 Series |
Series data lists 114% of engine speed for ratio 08; confirm the specific transmission and serial application. |
| HX/PX installation kit |
Current kit 48TK6720 includes 30T43806 12 V switch kit, pressure switch, wiring harness, Allison input cable, standard 28-inch hose kit, studs, gasket, and safety labels. |
| Cab switch |
The 30T43806 assembly contains rocker switch 30T35687, bracket 36T42362, and faceplate 36T42380. Muncie Start and overspeed control are separate options. |
Before ordering
| Check |
Why it matters |
| Transmission and age |
Verify model, serial number, opening, and build date. For the listed Allison 4000 application, Muncie notes pre-2006 units are limited to ratio codes 07 and below; this PTO uses ratio 08. |
| Pump interface and clearance |
Match the SAE B flange and 1-inch 15-tooth SAE BB spline; confirm pump rotation, mounting position, and space for hoses. |
| Speed and load |
Use the relevant 114% or 163% engine-speed relationship and the 360 lb-ft PTO rating; check pump and transmission drive limits. |
| Activation |
Provide a 12 V supply and connect the Allison PTO enable circuit when engaged. Put the engagement indicator where the operator can see it. |
Need help matching this PTO to your transmission and pump? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with the transmission model and build details, pump part number, and chassis information.
