Allison valve body for 1000, remanufactured and ready to install. Ships fast from the USA.
The first Allison 1000/2000 valve bodies GM put behind the Duramax in 2001 ran six solenoids on a single casting pair that stayed unchanged through 2003. If your truck is in that window and the transmission is flaring through gears, slow to engage, or has thrown a P0872 failsafe code, this remanufactured unit is built to that original casting rather than a later revision that will not interchange.
This early casting - upper half #29536838, lower half #29536840, with spacer plate #7440 - is a two-section valve body with six solenoids and a single tube on the bottom. Line pressure from the pump passes through its bores and spool valves, and the shift and pressure-control solenoids bolted to the body tell the TCM-commanded gear which clutch pack gets that pressure. GM added a seventh solenoid to this family starting in 2004, so this six-solenoid casting is specific to the earliest Allison 1000/2000 trucks.
Scan for codes before you commit to a valve body. Our Allison 1000 valve body problems and testing guide covers the vacuum test used to confirm a worn F-trim sleeve and the air check that isolates a sticking E-shift valve, so you can tell a valve body fault from a wiring or TCM issue before spending money on the wrong part.
This unit is built to the six-solenoid, single-tube casting used from 2001 through 2003 - casting #29536838/29536840 with spacer plate #7440. GM revised this family in 2004 to add the seventh solenoid, then again in 2006, and a full redesign in 2010, and none of those later castings will bolt in as a direct swap for this one. Confirm your build date before ordering, or browse the Allison transmission parts collection to find the specific casting for your truck if you are not sure which generation you have.
Change the filter and pan gasket in the same job using a filter and pan gasket kit so debris from the failed unit does not carry over, and torque the case bolts down in sequence - this generation does not use a separator plate gasket, so an uneven clamp load is enough to warp the castings and cross-leak pressure. Fill with TransSynd or Dexron VI; Allison's current approved spec is TES 668, and our Allison 1000 fluid and filter service guide has the capacities and the interval change that came with it. Clear codes and run the adaptive relearn after the swap, and if the internal harness shows heat discoloration at the connectors while the pan is down, replace it at the same time rather than reusing a marginal wire harness against a freshly rebuilt valve body.
| Transmission | Allison |
| Year Range | 1000 |
| Condition | Remanufactured / updated |
| Shipping | Ships from the USA |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
This casting (#29536838/29536840, spacer plate #7440) has six solenoids. GM added a seventh in 2004 to bleed pressure at idle. The two generations will not interchange.
P0872 and failsafe from a sticking E-shift valve, or P0741 with torque converter clutch surge or slip from a worn F-trim valve sleeve - both common on 2001-2003 units.
Yes, more so on this exact casting. That sleeve was only used through 2004, and 2001-2003 units are squarely inside that window.
Yes, all six solenoids are mounted, tested, and ready to bolt in.
TransSynd or Dexron VI (TES 668 is Allison's current spec), a fresh filter and pan gasket, cleared codes, and an adaptive relearn through light and moderate throttle.
