Allison valve body for 1000, remanufactured, OEM and ready to install. Ships fast from the USA.
If your 2006-2009 Chevrolet Silverado 2500/3500 HD or GMC Sierra 2500/3500 HD with the Duramax diesel is shifting harsh, slipping between gears, flaring on a shift, or has gone into limp mode with a solenoid or pressure code, the Allison 1000 valve body is the usual point of failure on these trucks. This listing is the 7-solenoid, 2-tube, OEM AL-2512 casting built specifically for the 2006-2009 model years, remanufactured and bench-tested with the correct updates before it ships, so you install a verified unit instead of reusing a worn core.
The Allison 1000 is a 5- and 6-speed heavy-duty automatic built for towing, and the valve body is its hydraulic brain. It routes line pressure through precision bores and spool valves to apply each clutch and band, and on this 2006-2009 unit it also carries the 7 shift and pressure-control solenoids the TCM uses to time every shift. Sonnax's Allison 1000/2000/2400 valve body identification guide documents that this casting generation changed from the earlier 2001-2005 units, and worn bores or sticking valves across the whole family tend to show up as the same shift-quality complaints regardless of which exact casting is involved.
Sonnax's TASC Force writeup on identifying these valve bodies ties specific failures to specific valves - a sticking E-shift valve to P0872 and failsafe, F-trim sleeve wear to P0741, and warped castings to a range of shift-quality complaints - so pulling codes and noting which shifts are affected tells you a lot before you spend anything. Our Allison 1000 valve body problems and testing guide walks through isolating a hydraulic valve body fault from a wiring or TCM issue, and if the complaint is specifically a torque converter shudder under load, our TCC shudder diagnosis guide covers the separate checks for that.
This unit is built for the 2006-2009 Allison 1000 as installed in the Chevrolet Silverado and GMC Sierra 2500/3500 HD with the Duramax diesel - the 7-solenoid, 2-tube, OEM AL-2512 casting generation. Allison ran at least four valve body versions across the 1000's production life, so a 2001-2005 truck needs a different casting than this one even though the symptoms look identical; we also stock the 2004-2005 7-solenoid, 1-tube version and the 2010-up no-tubes version for years outside this range. If you are not certain which casting your truck has, match the tube count and connector pattern against the listing photos, or send us your year and VIN and we will confirm before you order. The full Allison transmission parts collection has everything else we stock for this platform.
Drop the pan and filter at the same time as the valve body swap so debris from the old unit does not circulate into the new one - a PPE double-deep spin-on filter is the correct companion part for this platform. Torque the valve body bolts in sequence to spec rather than corner to corner, and refill with TES 668 full synthetic ATF; Allison's current fluid bulletin lists TES 668 as the recommended spec across the 1000 Series and backward compatible with the TES 295 and TES 389 fluids these trucks originally shipped with, and a 5-gallon pail of Castrol TranSynd 668 covers the full service. Clear codes and run the TCM's adaptive relearn after the swap so the computer re-times clutch fill and shift pressure against the new unit instead of the worn one it had adapted to.
| 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.
No - this listing is specifically the 7-solenoid, 2-tube, OEM AL-2512 casting used on the 2006-2009 Chevrolet Silverado and GMC Sierra 2500/3500 HD with the Duramax diesel. Allison used a different casting on 2001-2005 trucks and dropped the external tubes on 2010-up units, so match your year before ordering.
Harsh, late or flared shifts, slipping between gears, torque converter clutch shudder under load, and limp mode with a solenoid, ratio, or failsafe code. Clutch pack wear from heavy towing can produce similar symptoms, so scan for codes first.
Allison's current recommendation across the 1000 Series is TES 668 full synthetic ATF, which is backward compatible with the TES 295 and TES 389 fluids these trucks originally used.
Yes - clear codes and run the TCM's adaptive relearn so the computer re-times clutch fill and shift pressure against the new valve body instead of the worn one it had adapted to.
Yes - swap the filter and pan gasket when you install the valve body so debris from the old unit does not circulate into the new one. A PPE double-deep spin-on filter is the correct match for this platform.
Match the tube count (this is the 2-tube version) and solenoid connector pattern against the listing photos, or send us your year and VIN and we will confirm the correct casting before you order.
