Replacement filter and reusable-style pan gasket for the 10L1000 10-speed in 2020-2025 Chevy and GMC 2500HD/3500HD 6.6L L5P Duramax trucks.
If your 2020-2025 Chevrolet Silverado or GMC Sierra 2500HD or 3500HD with the 6.6L L5P Duramax is due for a transmission service, this is the filter and pan gasket that goes in it. The kit carries part number DF-434 and replaces GM filter 24298004, the original filter for the 10L1000 ten-speed. Owners usually order it ahead of a scheduled drain and refill, after a season of heavy towing, or when a pan drop for a leak or inspection means the old gasket should not go back on.
The 10L1000 is a big unit: GEARS Magazine puts it at more than 360 pounds, with four planetary gearsets, six clutches (seven on PTO trucks) and an off-axis, gear-driven vane pump. Every gear is made by applying a combination of those clutches, so the pump is feeding apply circuits and the valve body constantly. The filter sits in the pan and is the only thing between that pump inlet and whatever settles out of the fluid: friction material, fine wear metal, and gasket or seal debris. GEARS notes the clutch that most often burns on this unit is the 1-3-5-6-7-8-9 clutch, and when it does, that material ends up in the pan and in the filter first. A clean filter with a sealed neck keeps the pump from pulling air or debris; a loaded one restricts flow when the fluid is cold or when the truck is working hardest.
A new filter will not repair a clutch that is already burnt. If the pan is full of friction material or you have shift-related codes, the filter is a step in the diagnosis, not the fix.
Check the fluid level the GM way, hot and with the engine running, before blaming anything else; low fluid produces the same whine and slow engagement as a plugged filter. Scan for stored codes and watch transmission temperature on a tow. When the pan comes down, read the magnet and the bottom of the pan: a fine gray paste is normal wear, while flakes of friction material point to a clutch problem. Our delayed engagement guide and whine and clunk diagnosis guide walk through the same checks on GM's light-duty ten-speed, and the steps carry over.
This kit is listed for the 10L1000 in 2020-2025 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD trucks with the 6.6L L5P Duramax, and it replaces filter 24298004. It does not fit a 2019-or-older Duramax, which uses the Allison 1000 six-speed and a different filter; our 10L1000 vs Allison 1000 guide explains how to tell them apart from the RPO codes. GM also put the 10L1000 behind the 6.6L gas V8 starting with 2024, but this kit is listed for the Duramax only, so gas-truck owners should send us the year and VIN and we will confirm before you order. If you prefer a gasket with a reinforced metal core, the 10L1000 filter and metal-core pan gasket kit covers the same trucks.
The listing calls for a filter every 25,000 to 50,000 miles with 60,000 as the outside limit; shorten that if the truck tows near its rating or the fluid comes out dark.
| Fits | 10L1000 10-speed automatic, 2020-2025 Chevrolet/GMC 2500HD and 3500HD 6.6L L5P Duramax |
| Replaces | AC Delco 24298004 |
| Includes | Transmission filter, pan gasket |
| Part number | DF-434 |
| Service interval | 25,000-50,000 miles (60,000 max) |
| Weight | 1.69 lb |
No. A 2019 Duramax HD uses the Allison 1000 six-speed, which takes a different filter. This kit is for the 10L1000 ten-speed in 2020-2025 Duramax trucks.
It replaces GM filter 24298004 and comes with a new pan gasket, so you can do the whole pan service with one part number, DF-434.
DEXRON-ULV only. GM lists the 10L1000 fluid change capacity at 14.4 quarts. Do not substitute DEXRON VI or a universal fluid.
Those trucks also use the 10L1000, but this kit is listed for the L5P Duramax. Send us your year and VIN and we will confirm the filter matches before you order.
The listing calls for every 25,000 to 50,000 miles, with 60,000 as the maximum. Trucks that tow heavy or show dark fluid should be on the short end.
A filter and fluid service does not normally need a relearn. What matters is setting the fluid level hot with the engine running so the transmission is not left low or overfilled.
