Allison valve body for 1000, remanufactured and ready to install. Ships fast from the USA.
A Duramax Allison that neutralizes under load in fourth or fifth gear, slips 3-4, won't move after sitting overnight, or comes back with burnt C2 clutch plates is describing a known weak point in this transmission's valve body, not a mystery failure. This TransGo SHIFT KIT valve body repair kit addresses that weak point directly with revised internal components rather than swapping in a bare replacement casting, and it costs a fraction of a full remanufactured valve body.
TransGo builds three different kits across this transmission's life, matched to the casting generation: the ALLISON SK for the 2001-2005 five-speed, the Allison-Jr for the 2005-2010 six-speed, and the ALLISON-11UP performance reprogramming kit for 2011-and-up trucks. Each kit works inside your existing valve body rather than replacing the whole assembly - revised springs, recalibrated pressure-control valves, and on the 11UP, pump components as well - to raise clutch and band holding capacity and correct the pressure curve that is burning the C2 clutch or letting the torque converter clutch slip.
Pull codes and note exactly which gear the slip happens in - a 3-4 complaint with burnt C2 plates is the textbook case this kit was built for. Our Allison 1000 valve body problems and testing guide covers how to tell that pattern apart from a sticking E-shift valve or a bad solenoid before you spend money on the wrong fix.
Which version ships depends on your transmission's generation, not just the model year on the listing: five-speed 2001-2005 trucks get the ALLISON SK, six-speed 2005-2010 trucks get the Allison-Jr, and 2011-and-up trucks get the ALLISON-11UP. TransGo specifically does not recommend using the six-speed Jr kit on an early five-speed, since it will not deliver the full clutch-capacity gain that generation needs - send your year, make, model and VIN so we confirm the right kit before it ships. The Allison transmission parts collection also has complete remanufactured valve bodies if your truck needs a full replacement rather than a correction kit.
None of these kits require pulling the transmission - the valve body comes out with the pan down, same as any other valve body service. Change the filter and pan gasket while it is apart, and refill with TransSynd or Dexron VI; our Allison 1000 fluid and filter service guide has the current capacities and the move to TES 668. The 11UP kit also includes extension and pump housing gaskets since it touches pump components, so follow the included instructions for torque sequence rather than reusing old gaskets. Clear codes and run the adaptive relearn afterward with a heavy-duty Allison scan tool, and if the truck tows heavy, pairing this kit with a deep transmission pan adds fluid volume and cooling margin on top of the corrected pressure curve.
| 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.
It's TransGo's SHIFT KIT valve body repair kit. It works inside your existing valve body with upgraded springs and recalibrated valves rather than swapping the whole casting, which is why it costs far less than a complete remanufactured unit.
Whichever matches your transmission's generation: the ALLISON SK for 2001-2005 five-speed, the Allison-Jr for 2005-2010 six-speed, or the ALLISON-11UP for 2011-and-up. Send your year, make, model and VIN and we'll confirm before it ships.
The C2 clutch's classic 3-4 slip and neutralizing-under-load failure, no-move-after-sitting from converter drain-back, and sloppy low-line-pressure shifts with ratio or solenoid codes.
No. The valve body comes out with the pan down on every version of this kit.
At light and medium throttle it keeps the stock shift feel, firming up progressively only as you get into heavier throttle. TransGo offers calibration options for stock, work-truck, or performance use.
