Complete seal, gasket and O-ring set for a leak-free 6L80E or 6L90E rebuild on GM trucks, Escalade, Camaro and Corvette, 2006 to 2014.
If your Escalade, Avalanche, Express van, Hummer H2, Camaro SS or Corvette is leaving red spots under the bell housing or tailshaft, or you already have its six-speed on the bench for a rebuild, this is the sealing half of the job. The TRANSPEED T19502A set replaces the rubber and paper parts in a GM 6L80E or 6L90E so the rebuilt unit stays dry and holds pressure. The listing covers 2006-2014 applications across Cadillac CTS, STS, XLR and Escalade/ESV/EXT, Chevrolet Avalanche, Camaro SS, Corvette, Express and Savana, and the Hummer H2.
Every shift in a 6L80E is a hydraulic event. The pump builds line pressure, the control valve body and TEHCM in the pan route it, and the oil then has to travel through the case passages, the pump cover and the rotating shafts to fill one of five clutch pistons. Each handoff point is a sealed joint. When an internal O-ring or gasket hardens, the clutch it feeds fills slowly or bleeds off during apply, and the transmission computer sees it as slip. External seals do the more obvious job: the front seal rides on the converter hub, the rear seal rides on the output yoke or transfer case adapter, and the pan gasket seals the sump that holds the valve body. That is why a reseal is not cosmetic on this unit. Oil that escapes a circuit costs shift quality long before it costs fluid level.
There are no frictions, steels, pistons or filter in this set. If the clutches are burnt, step up to a 6L80 master rebuild kit with frictions, gaskets and filter instead of buying soft parts twice.
Fluid loss feeds the 6L80's known failures. Running low starves the converter clutch and the clutch packs, which shows up as converter shudder and worn 3-5-R and 4-5-6 clutches, both covered in our 6L80 common problems and fixes guide.
Wash the case and run the vehicle so you can trace a fresh leak to its source rather than guessing from where fluid collects. A converter seal leak and a pump leak both drip from the bell housing, and only teardown or careful inspection tells them apart. If the complaint is slow engagement or slip with no outside leak, check line pressure against commanded pressure first. Low pressure can be the pump itself, and our 6L80 pump failure symptoms guide walks through that test so you know whether you need seals or pump parts.
This kit is for the rear-drive 6L80E and 6L90E only. The two share a design, but Sonnax notes the 6L90 case is about 1-3/8 inch longer with a different output shaft, so read the tag on the case before ordering. Do not confuse these units with the front-drive 6T70 or 6T75, which take different seals. The listing names 2006-2014 vehicles; GM used these transmissions well beyond 2014, so if your truck is newer or you are unsure, send us the year and VIN and we will confirm against your build. More parts for this unit are on our 6L80 collection page.
| Fits | GM 6L80E / 6L90E 6-speed automatic |
| Kit type | Seal, gasket and O-ring overhaul set (reseal kit) |
| Includes | Front/rear shaft seals, pan gasket, paper gaskets, O-ring kit, external seals |
| Vehicle fitment | Cadillac CTS/Escalade/STS/XLR, Chevy Avalanche/Camaro SS/Corvette/Express/Savana, Hummer H2 |
| Year range | 2006-2014 (verify by transmission tag) |
| Part number | T19502A |
| Condition | Brand new, 1 set |
| Brand | TRANSPEED |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is the reseal set: shaft seals, pan gasket, paper gaskets, O-rings and external seals. Clutch plates, pistons and the filter are sold separately.
The listing covers both the 6L80E and 6L90E, including Express and Savana. The 6L90 case is longer, so confirm the tag on your unit and send year and VIN if you want us to double check.
Often, but the pump can leak in the same spot. The converter has to come out to see which one, and this kit includes the front seal either way.
Dexron VI. GM owner manuals for these vehicles call for it and list a fill plug check rather than a dipstick.
If the unit was apart or the valve body came off, clear transmission adapts with a scan tool and drive through every gear so the TCM relearns clutch fill times.
