Ultra-low-viscosity full synthetic ATF for Ford 10R80 and GM 10L80/10L90 10-speeds, meeting Mercon ULV and Dexron ULV specs. One gallon.
If you run more than one ten-speed, say a 2019-up Silverado or Sierra 1500 on the GM 10L80 and an F-150, Ranger or Mustang on the Ford 10R80, Triax ULV is a single fluid that lists both factory specs on one label: Ford MERCON ULV (WSS-M2C949-A) and GM DEXRON ULV, plus Mercedes MB 236.17. It is a 100 percent synthetic, one-gallon jug, and it is the budget-friendly way to service a ten-speed that has started to shudder, shift harshly, or run with fluid that has never been changed since the factory fill.
The ten-speeds have no bands and no dipstick. Each shift is one clutch releasing while another applies, timed by the TCM. The fluid is the hydraulic pressure behind every apply, the friction surface for the converter clutch and the main heat path out of the case. The design uses an ultra-low-viscosity fluid; Lubegard's breakdown puts ULV around 4.5 cSt at 100 C, well under older six-speed fluids near 6.0 cSt. That thin fluid has to keep its viscosity and friction properties for a long time. Triax rates this one for drain intervals up to 150,000 miles in normal service and 70,000 miles in heavy-duty use, and lists a pour point of -50 F for cold starts.
GM's bulletin 22-NA-182 groups harsh shift, shudder, surge, stall, flare and overheating complaints across its six-, eight- and ten-speeds, which shows how often these conditions are related to fluid and temperature and not a hard failure.
Pull codes before you spend money on fluid. Pressure control codes and line pressure faults point to the valve body or its solenoids; the 10L80 pressure control solenoid guide shows how to separate those from fluid issues. Look at the fluid from the pan plug, and check the case seams and cooler lines for leaks. A unit that is low will act like a fluid problem until you find the leak.
The listing names Ford 10R60 and 10R80, GM 10L80 and 10L90, Nissan Matic P and JATCO nine-speed applications. On the GM side that includes 2019-up Silverado and Sierra 1500, 2021-up Tahoe, Suburban, Yukon and Escalade, and the Camaro SS and ZL1 automatics. Earlier GM trucks in some years used six- or eight-speeds that need DEXRON VI or HP, so confirm the spec in your owner's manual or send us the year and VIN. Note that GM and Ford each publish a fluid by part number in their service instructions; this is an aftermarket fluid that lists both specs. Browse the full 10L80 parts collection for the unit's hard parts.
GM lists 8.1 quarts to change a 10L80's fluid through a pan and filter service, so two gallons covers that job with some fluid left for top-off. A simple drain-and-fill fits in one gallon. Pump the fluid in through the pan plug and set the level hot with the engine running at the temperature your service information gives; on the GM unit that is 75-80 C, and our 10L80 fluid capacity guide covers each step. Leave the side case plugs alone. If you are already in the pan because of a shift complaint, that is the time to look at a 10L80 shift kit, and a rebuild should start from the 10L80 overhaul kit with fresh fluid at the end.
| Fluid type | 100% synthetic ultra-low-viscosity (ULV) ATF |
| Volume | 1 gallon (128 fl oz) |
| OEM specs met | Mercon ULV, Dexron ULV, Ford WSS-M2C949-A, MB 236.17 |
| Applications | Ford 10R60/10R80, GM 10L80/10L90, Nissan Matic P, JATCO 9-speed |
| Pour point | -50 F for cold-start protection |
| Drain interval | Up to 150,000 mi normal service / 70,000 mi heavy-duty |
Yes, that is the reason to buy it. The label lists MERCON ULV (WSS-M2C949-A) and DEXRON ULV, so the same fluid covers a 10R80 and a 10L80. It is still an aftermarket fluid, not the factory part number from either dealer.
One gallon covers a drain-and-fill. A pan and filter service with a full refill is listed at 8.1 quarts, so buy two gallons. A rebuilt unit with the cooler takes about 13 quarts, or four gallons to be safe.
That is the maker's rating for normal driving. If you tow, plow, idle a lot or drive in heat, use the 70,000-mile heavy-duty interval or shorter. Fluid is cheap compared with a ten-speed rebuild.
No. Those GM units call for DEXRON VI or DEXRON HP, which are thicker fluids. Use ULV only where your owner's manual calls for a ULV specification.
If the shudder comes from old fluid that has lost its friction properties, a change often helps. If the converter clutch or valve body is worn, it will come back. Change the fluid, run a relearn, and if the shudder returns, look at hardware.
