Internal filter and pan gasket for the Allison 1000 behind a 2001-2019 6.6L Duramax with the standard pan. Replaces AC Delco 29542833.
If your 2001-2019 Silverado or Sierra 2500HD or 3500HD with the 6.6L Duramax is getting its transmission pan dropped, this is the filter and gasket you want in hand before the bolts come out. It is the internal suction filter and matching pan gasket for the Allison 1000 (LCT1000) with the standard-depth factory pan, and it interchanges with AC Delco 29542833. Owners usually land here for one of three reasons: the fluid came out dark or with glitter in it, the truck has started to whine or slip under load, or the pan has to come off anyway for a harness, solenoid or valve body repair.
The Allison 1000 runs two filters. The spin-on control main filter on the outside of the case cleans pressurized fluid on its way to the controls. The internal filter in the pan sits at the pump inlet, so every drop the pump picks up passes through it first. It catches the heavy debris: friction material shed by the clutch packs, case and gear wear, and anything left behind from a previous repair. Because it is on the suction side, a loaded internal filter never triggers a filter warning. It shows up as a pump that cannot get enough fluid, which means lower main pressure exactly when the truck is working hardest.
Start at the spin-on filter. Allison puts a magnet on the filter attachment tube, and its operator's manual says to clean it and report any metal larger than dust. Fine gray paste is normal wear; flakes or chunks mean something internal is coming apart and the pan needs to come down. Check the fluid level hot, not cold, and scan for stored codes, because a slip complaint with solenoid or pressure codes is a valve body or harness problem, not a filter. Our Allison 1000 limp mode diagnosis guide walks through separating those causes.
This kit is listed for the Allison 1000 behind the 6.6L Duramax in 2001-2019 Chevrolet and GMC 2500 and 3500 trucks with the standard factory pan. Pan depth is the deciding factor, not model year alone. Plenty of these trucks have had a deep pan bolted on at some point, and a deep pan needs a longer pickup. If yours has one, use the deep pan filter and gasket kit instead. Look at the pan before ordering, match the old filter if it is already out, or send us your year and VIN and we will confirm. More parts for this unit are on the Allison 1000 parts page.
On interval: Allison's own table treats the internal filter as an overhaul item and puts the spin-on on its own clock. In practice the pan-side filter earns a replacement any time the pan is off, any time the magnet shows real metal, and after any internal repair such as an internal wire harness or valve body job. The full schedule is broken down in our Allison 1000 fluid and filter service guide.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is the standard-pan length. A deep pan, factory or aftermarket, needs the longer deep pan filter so the pickup reaches the fluid. Check the pan before you order.
Allison's operator's manual lists the internal filter as an overhaul item, while the spin-on control main filter has its own interval (50,000 miles in general service). Most shops replace the internal filter whenever the pan is off or the spin-on magnet shows real metal.
Use an Allison-approved fluid. TES 668, such as TranSynd 668, is the current recommended spec and is backward compatible with older approved fluids. Allison no longer recommends Dexron VI in commercial on-highway units.
Allison lists refill at about 10.6 quarts for the standard sump and 7.4 quarts for the shallow sump, not counting cooler lines. Have a 3-gallon jug on hand and set the final level on the hot check.
Yes. Both filters clean the same fluid, so starting both circuits clean makes sense. Lubricate the spin-on gasket and tighten it one full turn after contact only.
Only if the slip comes from pump starvation. If the truck sets solenoid, pressure switch or ratio codes, or the magnet is loaded with metal, the problem is in the valve body, harness or clutches and needs diagnosis first.
