6L80 Planetary, used and ready to install. Fits the 6L80. Ships fast from the USA.
This is the front planetary out of a 6L80, the input planet, sold with its sun gear. It is a genuine GM part, used, and checked for pinion gear play and for chips on the pinion and sun gear teeth before it is listed. The carrier has four pinions with 22 teeth each and measures 4.480 inches across. If you have a 6L80 apart because of a whine that rises with road speed, metal on the magnet, or a carrier with a rough or loose pinion, this is the piece that goes back in at the front of the gear train.
The 6L80 is a Lepelletier design: a single simple planetary up front and a compound set behind it. The input planetary is that front set. Engine torque from the converter turbine shaft enters here, and the gearset hands a reduced-speed output to the clutches that drive the rear gear train in the lower gears and Reverse. Because the front set is in the power path in most ranges, its pinion needle bearings and thrust washers turn almost every mile the vehicle drives. Lose a needle bearing or let the end play grow, and the pinions tilt on their shafts, the teeth start to mark, and debris travels straight back into the clutches and valve body.
A whine is not always gears. A noise that follows engine speed in Park or Neutral points at the pump; the 6L80 pump failure symptoms guide walks through telling them apart. Pull the pan and look at what is on the magnet before you condemn anything. With the unit apart, spin each pinion: it should turn smoothly with no catch, and it should not rock on its shaft. Check sun gear teeth and splines for pitting or chipped edges. The 6L80 common problems guide covers the clutch and converter failures that often travel with a damaged front set.
This front planet and sun gear fit the GM 6L80 used from 2006 on in Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade, Camaro and Corvette applications. The listing also notes it will work in a 6L90, even though the factory 6L90 front planet uses six pinions instead of four; a 6L90 builder going this route is giving up the extra pinions, so think about the load the unit will see. Compare the carrier you remove against the photos: pinion count, 22-tooth pinions and the 4.480 inch diameter. If anything does not match, send us your year and VIN first. Dated versions for 2006-2011 units and other 6L80 hard parts are in our 6L80 parts collection.
Clean the carrier and sun gear and inspect them again on your own bench. Replace the thrust bearings and washers on both sides of the set, check the bushings that ride on the input and stator shafts, and measure end play during assembly. A 6L80 bushing driver kit makes the bushing work clean and square. If the old set shed metal, the clutches, valve body and cooler took that debris too, so plan on a 6L80 master rebuild kit and flush the cooler and lines. Fill with Dexron VI through the check plug procedure and reset adapts before the first road test.
| Fits | 6L80 |
| Part type | Planetary |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is the input, or front, planetary with its sun gear. It is a four-pinion carrier with 22-tooth pinions and a 4.480 inch outside diameter.
The listing states it will work in a 6L90, though the factory 6L90 front planet has six pinions. For a heavy-duty or high-load 6L90 build, consider whether the four-pinion part suits the load.
Yes. It was checked for pinion gear play and for chips on the pinion and sun gear teeth. Inspect it again yourself before assembly, as you would any hard part.
Thrust bearings and washers on both sides, any worn bushings, and the clutches if debris reached them. Flush the cooler and lines so old metal does not return to the new parts.
Planetary noise tracks road speed and changes with gear. Pump noise follows engine rpm and is present in Park or Neutral.
