K310 CVT Transmission Master Rebuild Kit Corolla

If your 2006-2015 Corolla or Auris with the Super CVT-i shudders as it pulls away, slurs into Drive or Reverse, or weeps fluid from the case seams, the transaxle is very likely a K311 (1.8L) or K310 (1.5L). This master rebuild kit gives you the clutch frictions, steel plates, rubber seals, O-rings, sealing rings and case gaskets to take one apart on the bench and put it back together with every soft part renewed.

What the master rebuild kit does in a K310 / K311

Toyota and Aisin began building the K310 family in September 2006 for 1.5 to 1.8 liter cars. It is a belt-and-pulley CVT: the ratio changes continuously between a low of about 2.386:1 and an overdrive of about 0.411:1 as hydraulic pressure squeezes the primary and secondary pulleys. The belt only turns one way, so a small planetary set ahead of the pulleys handles direction. A multi-plate forward clutch locks it for Drive and a multi-plate reverse brake holds it for Reverse. Those two packs, the seals that let their pistons hold pressure, and the gaskets that keep fluid inside the case are what this kit replaces. The pulley sheaves, belt and valve body are not in it.

Symptoms that point to a rebuild

• Shudder or judder from a stop, worst on light throttle with the fluid hot
• A pause of a second or more before the car moves after selecting Drive or Reverse
• Engine speed flaring at takeoff without the car pulling
• Dark, burnt-smelling fluid with fine friction material in the pan
• Seepage at the case halves, side cover or axle seals

Worn belts and scored pulleys also shudder, and they leave steel debris rather than friction dust. Pull the pan and look at the magnets before you commit to soft parts only.

How to confirm the problem first

Check fluid level at operating temperature and read any stored codes before tearing anything down. Slip that appears only in Reverse points at the reverse brake; slip in Drive with a clean Reverse points at the forward clutch. A sticking pressure solenoid can mimic both, so rule it out using our CVT slipping under load guide and the harsh or delayed engagement walkthrough.

Fitment

This kit is listed for the K310 and K311 in the 2006-2015 Toyota Corolla and Auris (manufacturer part number AHM-QMP-GN01871). Most of these vehicles are Japanese-market or international cars, often imports: US-market Corollas of that era used a conventional automatic, and the 2014-up US Corolla CVT is the later K313. The listing mentions K313 coverage, but the K313 is a different unit with its own fluid, so read the tag on your transmission. If it says K313, the K313 master rebuild kit is the one to buy. Compare the pan gasket outline and plate tooth count against your old parts, or send us your year and VIN and we will check. The rest of our belt-type units are on the CVT parts page.

Install notes

• Plan on removing the transaxle and splitting the case. Clean every passage; friction dust left in the case finds its way back into the valve body.
• Soak new frictions in fresh CVT fluid before stacking, then measure each pack's clearance on assembly instead of assuming it is right.
• Size the new sealing rings before closing the case so they do not cut on install.
• If the pump bushing or gears are scored, a replacement K310 oil pump belongs in the same job. Units with a long history of shudder often need a K310 valve body as well.
• Refill only with Toyota CVT Fluid TC unless your owner's manual specifies otherwise; never use conventional ATF. Set the level at temperature through the check plug and clear learned values with a scan tool.

Does this kit fit a 2014-2019 US Corolla?

Usually not. The US Corolla CVT from 2014 on is the K313, which is a different transmission. Check the tag on the case; if it reads K313, use the K313 kit.

What is the difference between the K310 and K311?

Engine size. The K310 is paired with 1.5L engines and the K311 with 1.8L engines. This kit is listed for both.

Is the belt or pulley included?

No. The kit covers the forward clutch and reverse brake plates plus the seals and gaskets. Inspect the belt and pulley faces during teardown and replace them separately if they are worn.

What fluid should I refill with?

Toyota CVT Fluid TC for the K310/K311 unless your owner's manual says otherwise. The K313 uses Toyota CVT Fluid FE, so do not mix them up.

Will a rebuild cure takeoff shudder?

It will when the shudder comes from glazed clutch packs or leaking piston seals. Shudder caused by a damaged belt, scored pulleys or a faulty solenoid needs those parts too.

Do I need a scan tool after the rebuild?

Yes. You need it to read fluid temperature for the level check, clear codes and reset CVT learned values.

• CVT Slipping Under Load: Root Causes and Fixes
• CVT Harsh or Delayed Shifts: A Diagnostic Walkthrough
• CVT Limp Mode: Causes and How to Diagnose It
• CVT Transmission Failure Patterns Across Brands