Allison valve body for 1000, remanufactured and ready to install. Ships fast from the USA.
A 2010-or-newer Chevrolet Silverado or GMC Sierra 2500/3500 HD with the Duramax diesel that shifts harsh, slips on an upshift, flares between gears, or drops into limp mode with a solenoid or ratio code is almost always pointing at the Allison 1000 valve body. This listing is the later-generation casting Allison introduced for 2010 and up, built without the external accumulator tubes used on the 2004-2009 versions, remanufactured and bench-tested before it ships so you are installing a known-good unit rather than gambling on a worn core.
The Allison 1000 is a 5- and 6-speed heavy-duty automatic, and the valve body is the hydraulic control center that meters line pressure to every clutch and band while carrying the 7 solenoids the TCM uses to time each shift. Allison moved the accumulator circuitry internal on the 2010-up casting, eliminating the external tubes that ran on the 2004-2009 units. Sonnax's identification guide for this valve body family notes that the underlying bore and valve layout carries over across these generations even as the external hardware changed, which is why the same failure points and fix show up on every casting year.
Pull codes and note exactly which shift is affected before replacing anything - a sticking shift or trim valve throws different codes than a failing solenoid, and the two repairs are not the same price. Our Allison 1000 valve body problems and testing guide covers the checks that separate a hydraulic valve body fault from a wiring, TCM, or speed-sensor issue, and if limp mode is the main complaint, our Allison 1000 limp mode guide lists the other causes worth ruling out first.
This valve body is built for the 2010-and-up Allison 1000 in the Chevrolet Silverado and GMC Sierra 2500/3500 HD with the Duramax diesel - the no-tubes casting. It is not the same casting as the earlier 2-tube 2006-2009 unit or the 1-tube 2004-2005 unit, so if your truck is older than 2010 you want our 2006-2009 7-solenoid, 2-tube version instead. Confirm by checking whether your original unit has the external tubes at all before ordering, or send your year and VIN and we will verify. The full Allison transmission parts collection covers everything else we stock for this platform, including the cooler line kits for the LML and L5P engine years.
Service the pan and filter at the same time as the valve body so contamination from the failing unit does not carry over into the new one - our deep pan kit with filters is sized for this platform. Torque the bolts in the correct sequence rather than working corner to corner, and refill with TES 668 full synthetic ATF, which is Allison's current approved fluid for the 1000 Series. If your truck runs the LML or L5P Duramax, inspect the cooler line kit for that engine while the pan is down, since cracked lines on these later trucks are a common companion failure. Clear all codes and run the TCM's adaptive relearn after the swap so clutch fill and shift pressure are retrained against the new unit.
| 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.
Allison moved the accumulator circuitry internal starting in 2010, eliminating the external tubes used on the 2004-2009 castings. This listing is that later, no-tubes version.
No - a 2008 truck uses the earlier 2-tube casting. Order our 2006-2009 7-solenoid, 2-tube version instead, or send your VIN if you are not sure which casting your truck has.
Harsh or flared shifts, slipping between gears, torque converter clutch shudder, and limp mode with a stored solenoid, pressure, or ratio code.
TES 668 full synthetic ATF, which is Allison's current approved fluid for the 1000 Series.
Yes - clear all codes and run the TCM's adaptive relearn so clutch fill and shift pressure are retrained against the new valve body.
On LML and L5P Duramax trucks, inspect the transmission cooler lines for cracking while you have access - it is a common companion failure on these later model years.
