Refurbished and tested 7-piece solenoid set for the Allison 1000/2000 5-speed behind the 1999-2005 6.6L Duramax. Replaces 8683167 and 29533074.
This is the budget-minded way to put a full set of solenoids in an older five-speed Allison 1000/2000 behind the 6.6L Duramax. Each solenoid in the kit has been disassembled, cleaned, had worn internals replaced, and the kit is pressure and signal tested before it ships. If your 1999-2005 GM truck is shifting late, flaring or slipping between gears, or storing pressure control and shift solenoid codes, it replaces all seven units without paying new-part pricing on every one. It cross-references 8683167, D116420A, 29533074, 29533075 and 29536833.
On the five-speed Allison the solenoids are the link between the TCM and the hydraulics. Three shift solenoids position the shift valves, two trim solenoids meter how quickly each clutch applies and releases during a shift, one solenoid controls converter clutch lockup, and on 2004-2005 units a seventh solenoid lowers line pressure at idle and light cruise. A solenoid that responds slowly when hot, or whose seat no longer seals, leaves the TCM commanding pressure that never shows up at the clutch.
Shift-quality problems on this unit are not always solenoids. In one case written up in Gears Magazine, a five-speed Allison flared only after half an hour of driving with no codes. The shop logged commanded and actual trim solenoid current cold and hot, found the commands nearly identical, air checked the clutch circuit, and then vacuum tested the trim valves. Trim valve A held only 12 in-Hg of vacuum; after the valve repair it held 22 and the flare was gone. A worn trim valve bore will defeat a new set of solenoids, so it pays to check the valve body while the pan is off. Our valve body testing guide covers those checks, and a heavy-duty scan tool for Allison transmissions lets you read the codes and trim data yourself instead of guessing.
For the five-speed Allison 1000/2000 used with the 6.6L Duramax in GM pickups; the listing covers 1999-2005, and the Duramax and Allison pairing went into Silverado and Sierra HD trucks starting with the 2001 model year. The 2001-2003 valve body holds six solenoids, so the seventh (G) part goes unused there; 2004-2005 trucks use all seven. The connector and mounting layout match the originals. It does not fit the 2006-up six-speed, which uses different solenoids. Compare the part numbers on your old solenoids, or send your year and VIN to confirm. See every part we stock for this unit in the Allison collection.
Drain the fluid, remove the pan and filter, and look at what is in the pan before you go further: heavy clutch material or metal means the solenoids are not your only problem. Unplug and unbolt the solenoids, inspect the valve body for debris, and install the refurbished set with lubricated O-rings, each in its matching location. Install a new filter and pan gasket kit, then refill with TranSynd or another Allison-approved fluid; a 5-gallon pail of TranSynd 668 covers the refill with fluid left for a follow-up change. Clear codes and run the relearn so the TCM adapts to the new solenoids. Our fluid and filter service guide has the capacities and intervals.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Refurbished. Each solenoid is disassembled, cleaned and has worn internals replaced, and the kit is pressure and signal tested before shipping.
Worn trim valve bores in the valve body cause the same flares. In a documented Gears Magazine case the fix was a trim valve repair after it failed a vacuum test, not solenoids.
Yes. Those valve bodies use the same trim, shift and TCC solenoids but have no G solenoid, so that one part is left over. 2004-2005 trucks use all seven.
TranSynd or another Allison-approved TES 295 or TES 668 fluid. TES 668 is Allison's current recommended spec.
No. The 2006-up Allison is a six-speed with a different solenoid set.
