3L Transmission Fluid Pump Kit with Gauge and 15 ATF Adapters

If you own a 2015-or-newer Silverado, Sierra, Yukon, Escalade, Corvette or Camaro with the GM 8-speed, you already found out there is nothing to pull and nothing to pour into from the top. The 8L90 and 8L45 are filled from underneath, through a port on the case, while you watch fluid temperature. This 3 liter kit is the hand-pressurized tank that makes that job controllable: pump the tank up, read the 0-86 psi gauge, and meter fluid in with the ball valve instead of fighting a squeeze bottle under a running truck.

What this fill pump does on a GM 8-speed

GM states it plainly in bulletin 18-NA-355: because the transmission is not equipped with a fill tube and dipstick, a tube in the bottom pan is used to set the level. You add fluid at the fill port and the level is correct when fluid drips from the check plug in the pan. That means the fill has to be slow and stoppable. A pressurized tank with a gauge lets you push fluid in at a steady few psi, close the valve the moment the check plug starts to drip, and bleed the tank with the relief valve before you uncouple the hose. The 3 liter (about 3.1 quart) tank will not hold a whole pan service in one go; GM lists the 8L90 fluid change at 7.0 L / 7.4 qt, so plan on two or three tank refills, or use it for top-offs and level corrections after the bulk of the fluid is in.

Symptoms that send people under an 8L90 with a fill pump

• Shake or shudder under light throttle between 25 and 80 mph, the condition GM covers in 18-NA-355 with a full fluid exchange to the correct fluid
• Fluid level set with the truck cold, hot, or with the engine off, leaving the unit over or under full
• Fluid spitting from the vent after a service, a sign of overfill
• Wear and slipping complaints after a pan drop that was never topped off correctly
• A filter or pan gasket replacement that now needs the level set from scratch

How to confirm the level before you add anything

Do not add fluid on a guess. GM wants transmission fluid temperature between 35 and 45 C (95-113 F) on a scan tool; above that window the unit ends up under-filled, below it over-filled. On Silverado, Sierra, Yukon and Escalade trucks with a thermal bypass valve, GM has you heat the fluid to at least 90 C (194 F) first so the cooler circuit fills, then shut down and let it cool back into the window. The engine must be running when the check plug comes out. Our 8L90 fluid type and capacity guide walks through the full sequence, and flush vs drain and fill explains why a pan drop alone will not cure shudder.

Fitment

This is a universal tool, not a part tied to one transmission. On the GM side it suits 8L45 and 8L90 applications from 2015 on. GM's own procedures use a dedicated fill adapter, DT-51190, so check whether one of the 15 included adapters seats in your port before you start. If none does, the GM ATF filler adapter for 6L80, 8L90 and 10L80 threads straight into the case and couples to this hose. The adapters also cover common Ford, BMW, VW, Audi, Toyota, Lexus and Nissan fill plugs. Browse every part we carry for the 8-speed on the 8L90 parts page.

Install notes

• Use DEXRON HP in the 8L45/8L90. GM's 2015 exchange bulletin PIP5200C warns that the transmission uses DEXRON HP only; do not put DEXRON VI or ULV in this tank for that job.
• Keep the tank dedicated to one fluid or rinse it between types. GM notes that intermixing other fluids lowers the concentration of the new fluid.
• Hand-tighten any fill adapter. GM says not to exceed 9 N-m (80 lb-in) on its adapter, and the level check plug also goes back at 9 N-m.
• Fill the tank at shop temperature; the pump is rated for 41-113 F operation.
• Doing a pan service at the same time? Install the 8L90 filter kit 24274402 and set the level last.

Kit contents: 3 L tank with plunger pump, pressure gauge and relief valve, delivery hose with ball valve and quick coupler, 15 ATF adapters with storage strap, funnel and cap wrench.

Will this pump work on my 2015-2024 Silverado with the 8-speed?

Yes, it is a universal fill tool. Check that one of the 15 adapters seats in the fill port; if not, pair it with a GM-style 8L90 filler adapter that threads into the case and accepts the hose.

How many times will I refill the 3 liter tank for an 8L90 pan service?

GM lists the 8L90 fluid change at 7.0 liters (7.4 quarts), so expect two to three tank loads. Many owners use it for the final level set after the bulk of the fluid is in.

What fluid goes in an 8L90 or 8L45?

DEXRON HP. GM bulletin PIP5200C says the 8L90 uses DEXRON HP only. It is not interchangeable with DEXRON VI or the DEXRON ULV used in the GM 10-speeds.

Why does the fluid temperature matter so much when I fill?

GM sets the level at 35-45 C (95-113 F). Checking hotter leaves the unit under-filled and colder leaves it over-filled, which can push fluid out the vent. Trucks with a thermal bypass valve need a heat cycle to 90 C first.

How much pressure should I run in the tank?

Only enough for a steady flow you can stop instantly. The gauge reads to 86 psi, but a few psi is plenty for an ATF fill; close the ball valve as soon as the check plug starts to drip, then bleed the tank with the relief valve.

Can I use it for transfer cases and differentials?

Yes. Rinse the tank and hose between fluids, and never let gear oil end up in a transmission fill.

• 8L90 Fluid Type and Capacity
• 8L90 Flush vs Drain and Fill
• 8L90 Filter and Pan Service
• 8L90 Shudder on Acceleration
• 8L90 Overheating Prevention