Pressurized 3-liter hand pump that pushes ATF up into hard-to-reach fill ports on ZF 8HP, 6L80E and side-fill transmissions without a mess.
Refilling a 6L80 in a Silverado, Sierra, Tahoe, Yukon or Escalade after a pan and filter service is the step that turns a clean job into a mess. There is no dipstick tube to pour into, the fill point sits on the side of the case above the exhaust, and the level has to be set hot with the engine running. The AIGMISON AG3A is a budget-friendly answer: a 3-liter tank you pressurize with the hand pump, then meter fluid into the case through a brass ball valve and a bendable nozzle you can aim around the exhaust and crossmember.
Sealed six-speeds like the 6L80 are filled until fluid just starts to come back out of the check plug at operating temperature. Gravity will not move ATF uphill into the case, so you need pressure. You pour fluid in through the wide funnel built into the lid, pump the handle a few strokes, then open the green-lever ball valve and the tank pushes fluid out on its own. Close the valve the moment you see fluid weep back from the plug. Because the tank does the pushing, one hand stays free to hold a light or the drain pan.
Measured from our product photos, the tank is about 13.4 in tall and 7.3 in wide, the clear supply hose runs about 51 in, and the segmented blue nozzle is about 14 in long. That segmented nozzle holds whatever bend you give it, which is the real advantage on trucks where the fill opening is tucked behind the catalytic converter heat shield. A shoulder strap lets you carry it like a sprayer, and the graduated side of the tank is marked from 1.0 to 3.0 liters so you can keep count of how much went in.
A fresh fill only helps if the problem is the fluid. GM bulletin 20-NA-142 ties 6L80 shudder and surging to worn-out fluid additives and corrects it with three drain-and-fills of DEXRON VI, with the filter replaced on the last one. If you have slipping, flares or burnt fluid with debris, a new fill will not cure it. Read our 6L80 common problems guide before you buy fluid, and if you hear a whine that rises with engine speed, check the 6L80 pump failure symptoms article as well.
This is a universal fluid transfer tool, not a part that bolts to one transmission. It does not include threaded fill-plug adapters; the nozzle tip is pushed into or held at the fill opening. That works on the 6L80 and most side-fill and check-plug designs, but if your transmission needs a threaded connection to fill, our 3L manual ATF fill pump with plug adapters is the better choice. Other GM six-speed service parts are in the 6L80 collection.
| Capacity | 3 liters (approx. 3 quarts) |
| Type | Manual pressurized fill / transfer pump |
| Outlet | Bendable metal gooseneck with hang clip |
| Best for | ZF 8HP, GM 6L80E/6L90E and other side-fill / check-plug fills |
| Also handles | ATF, gear oil, 75W-90 (thicker fluids flow slower) |
| Weight | 2.12 lb |
| Model | AG3A |
| In the box | Pump tank, hose, flexible outlet tip |
Yes. Push or hold the nozzle tip at the fill opening, pressurize the tank and open the ball valve until fluid starts running back out of the check plug, then confirm the level hot with the engine idling.
No. It uses a bendable nozzle with a tapered tip rather than threaded adapters. If your transmission needs a threaded connection, choose a fill kit that includes plug adapters.
3 liters, a little over 3 quarts, with graduations on the tank from 1.0 to 3.0 liters. A 6L80 pan and filter service takes about 6 quarts, so you will refill once.
No. The built-in hand pump pressurizes the tank. A few strokes is enough to move ATF; open the brass ball valve to start flow and close it to stop.
Yes, it transfers gear oil such as 75W-90 into side-fill differentials and manual gearboxes. Heavy oil moves slower, so warming it first helps. Clean the tank between fluid types.
