10L90 Overhaul Kit, new and ready to install. Fits the 10L90. Ships fast from the USA.
The 10L90 is the version of GM's ten-speed built for high-output engines, and it shows up behind the 6.2L V8 in the Camaro and behind the twin-turbo 4.2L in the Cadillac CT6. This Transtec overhaul kit, maker part 2753, supplies the gaskets and seals for a full 10L90 rebuild, without pistons. Owners usually find it after the car starts flaring between gears at wide-open throttle, slips on a hard launch, or leaves drips under the case, and a shop has said the unit needs to come apart.
Inside, the 10L90 works like the 10L80: six clutches, four of them applied in each gear, with the valve body timing a short overlap as one clutch releases and the next one applies. What changes is how much torque those clutches have to hold, which makes the 10L90 less forgiving of any leak in the apply circuits. Fluid runs from the pump through the valve body and case and crosses into the rotating shafts and drums through sealing rings before it reaches each piston. This kit renews those rings along with the gaskets, O-rings and lip seals, so each clutch fills quickly and clamps at full pressure instead of sliding under a supercharged or turbocharged engine.
Rule out the cheaper causes first. ATRA points out that a harsh first engagement right after a cold start can be normal, because the engine runs at a raised idle for up to 90 seconds to heat the catalytic converter. Low line pressure from the pump or the main regulator valve also mimics worn seals, and the 10L80 and 10L90 pump failure guide covers how to separate the two. Camaro owners should also read about the GM 10-speed valve body recall: GM recalled 2020-2022 Camaros and some Cadillacs with the 10-speed over valve body wear that leaks pressure, so check whether that work has been done before you start a rebuild.
Transtec catalogs kit 2753 for both the 10L80 and the 10L90 from the start of production. On the 10L90 side, its named applications are the 6.2L Camaro and the 2018 Cadillac CT6 with the 4.2L V8. These are early, Generation 1 transmissions. Later 10L90 units moved to the Generation 2 valve body, and some cars are shift-by-wire, so a 2020-or-newer car may need a different kit. Use the RPO QR label on the driver door B-pillar to identify your unit, or send us your year and VIN before ordering. The parts we stock for this transmission family are on the 10L80 and 10L90 parts page.
| Fits | 10L90 |
| Part type | Overhaul Kit |
| Condition | New |
| 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.
The maker lists the 6.2L Camaro among its 10L90 applications, which is the engine used in the ZL1. Confirm with your RPO code or send us your VIN before it ships.
Yes. Transtec kit 2753 is cataloged for both the 10L80 and 10L90 because the two share their sealing layout. What differs between the units is mostly clutch capacity, not the seals.
No. This is the version without pistons, so reuse yours if they are in good shape or order replacements separately.
Not necessarily. The recall addresses valve body wear. If the clutches are healthy and the unit does not leak, a rebuild may not be needed. Diagnose the pressure loss first.
Dexron ULV. Check the level hot using the GM procedure, then clear the adaptive values and run the fast learn with a scan tool.
