Allison valve body for 2000, remanufactured and ready to install. Ships fast from the USA.
The 2001-2003 Allison 2000 - the earliest generation of this medium-duty transmission, used in GM Kodiak and TopKick cab-and-chassis trucks and other commercial chassis with the Duramax diesel - ran a 6-solenoid valve body with a single external transfer tube, the launch casting Allison replaced with a 7-solenoid design starting in 2004. If a truck in this three-year window is shifting harsh, slipping, flaring, or has thrown a limp-mode code, this remanufactured valve body is built for that original 6-solenoid casting, bench-tested with the correct updates before it ships.
Transmission Digest's casting-identification writeup for this family documents the 2001-2003 valve body by its casting numbers - 29536838 or 29536840 - paired with spacer plate 7440, distinct from the 7-solenoid castings Allison introduced from 2004 onward. The valve body is the hydraulic brain of the transmission on every one of these castings: it routes line pressure through precision bores and spool valves to apply each clutch and band, and on this electronically controlled unit the 6 solenoids are what the TCM fires to time every shift.
Pull codes and note which shift is affected before ordering anything - Sonnax ties a sticking E-shift valve to P0872 and a failsafe condition, and worn F-trim sleeves to P0741 and torque converter clutch surge, which carries over to this earlier casting since the same bore layout runs forward into later generations. Our Allison valve body testing guide covers those checks, and a heavy-duty Allison scan tool will pull the manufacturer-specific codes a generic reader can miss on a truck this old.
This valve body is built for the 2001-2003 Allison 2000 - casting 29536838/29536840 with the 7440 spacer plate - as used in Kodiak, TopKick and other medium-duty chassis with the Duramax. Allison moved to a 7-solenoid casting for 2004-2005 and added a second tube for 2006-2009, so this part is not interchangeable with either later version; match your solenoid count against the listing photos or send your chassis year and we will confirm. The full Allison transmission parts collection covers every later casting we stock, and the Allison 1000 Series used this same early casting in pickup trucks of the same model years.
On a truck this age, service the pan and filter at the same time as the valve body - a deep pan and filter gasket kit is sized for this platform. Torque the bolts in sequence to spec, and refill with TES 668 full synthetic ATF, Allison's current approved fluid across the 1000, 2000, 3000 and 4000 Series and backward compatible with the TES 295 this truck originally shipped with. Inspect the internal wire harness for chafing while the pan is down, since a cracked harness on a unit this old throws the same solenoid codes as a failing valve body, and check the output shaft lock nut torque with the correct lock nut socket if the driveline was disturbed. Clear codes and run the TCM's adaptive relearn once the swap is finished.
| Transmission | Allison |
| Year Range | 2000 |
| Condition | Remanufactured / updated |
| Shipping | Ships from the USA |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Transmission Digest documents the 2001-2003 Allison 1000/2000 valve body as casting 29536838 or 29536840 paired with spacer plate 7440, distinct from the later 7-solenoid castings.
No - Allison moved to a 7-solenoid casting starting in 2004. Order the year-correct version, or send your chassis year if you are not sure which casting you have.
Harsh or flared shifts under load, slipping or hunting between gears, torque converter clutch slip or shudder while pulling, and limp mode with a stored solenoid, pressure or ratio code.
TES 668 full synthetic ATF, Allison's current approved fluid across the 1000, 2000, 3000 and 4000 Series, backward compatible with the TES 295 these trucks originally used.
Yes - clear codes and run the TCM's adaptive relearn so clutch fill and shift pressure are retimed against the new valve body.
Yes - the 1000 and 2000 Series share this early 6-solenoid casting for 2001-2003; the Series designation reflects the chassis GVWR rating, not a different valve body.
