AF40 Overhaul Kit 2005

If your Ford Fusion, Mercury Milan, Lincoln Zephyr or MKZ, Five Hundred, or Mazda6, CX-7 or CX-9 with the Aisin six-speed is leaking at the axle seals, slow to grab Drive on a cold morning, or flaring between gears once it is hot, the problem is often hardened rubber rather than burnt clutches. This listing is a new TransTec overhaul kit carried under reference DP2511 and marked for 2005-up units. The listing title says AF40, but the kit itself is described as the AF40 / AF21 / TF-81SC kit, and the 2005-on start date matches the rebuilder catalog entry for the Ford and Mazda version of this transmission, the TF-81SC (AF21). Read the fitment section before you order.

What the overhaul kit does in a TF-81SC

The TF-81SC is a transverse six-speed built around a Lepelletier gear train: one simple planetary set feeding a Ravigneaux set, with three clutches and two brakes and no band. Every shift is one element letting go while the next one applies, timed by linear solenoids in the valve body. That clutch-to-clutch handoff only works when each piston seal and each rotating sealing ring holds the pressure the solenoid commands. Once the rubber shrinks or hardens, apply oil bleeds off during the fill, the clutch comes on late, and the control unit keeps adapting until it runs out of room. According to the listing, this kit carries the sealing parts for the 4-5-6 (C2) clutch, the 3-5-reverse clutch, the low and reverse (B2) brake and the B1 servo, a full sealing ring set and the converter seal. The photo also shows the valve body and separator plate gaskets, the pan gasket, lip seals and the O-ring assortment. Frictions, steels, a filter and hard parts are not included.

Symptoms that point to a reseal

• Fluid leaking at either drive axle seal or out of the bellhousing at the converter seal
• A wet pan rail or valve body area that comes back after a gasket-only repair
• Delayed engagement into Drive or Reverse when cold that improves as the fluid warms
• Upshift flare, especially 3-4 or 4-5, once the unit is at full temperature
• Ratio fault codes P0729, P0734 or P0735; on this family those can also come from low solenoid feed pressure in the valve body, so do not assume seals

How to confirm before you buy

Drop the pan and read what is in it. Clean red fluid with a shift complaint points at sealing or the valve body; dark fluid with lining paste means a clutch pack is gone and a seal kit alone will not save it. In that case step up to the TF-81SC master rebuild kit with frictions and steels. Sonnax documents wear in the solenoid modulator bore of the TF-80SC and TF-81SC that drops feed pressure and sets the same ratio codes, so check the valve body and solenoids before you blame rubber. Our Aisin harsh or delayed shift walkthrough lays out the order of tests, and the shift flare vs slip guide helps you tell a leaking circuit from a worn clutch on a road test.

Fitment

The kit is listed for 2005-up six-speeds under DP2511. The rebuilder parts catalog lists the TF-81SC / AF21 overhaul kit as the Ford and Mazda application from 2005 on, and the GM, Saab and Volvo TF-80SC / AF40 as a separate kit from 2006 on. Sonnax warns that parts from these two units look nearly identical but do not interchange. If you own a Saab 9-3, Cadillac BLS, Opel or Volvo with the GM-style AF40, the AF40 overhaul kit for 2006-up (DP2512) is the better starting point. Read the tag on the case, compare it with the listing photo, or send us your year and VIN and we will check before it ships. Every related part is in the Aisin transmission collection.

Install notes

• Soak lip seals and O-rings in the fluid your vehicle maker specifies, and hold the sealing rings in place with assembly gel so they do not cut when the shafts slide through.
• Look at every seal bore and the axle shaft surfaces before you drive new seals in; a groove worn into the shaft will leak past a brand-new lip.
• Air-check C1, C2, C3, B1 and B2 with the case open. A clutch that will not hold air on the bench will not hold oil in the car.
• If the solenoids are slow or out of resistance, replace them while the valve body is off; the TF-81SC solenoid kit covers that.
• Refill with the fluid listed in the owner manual for your model, check level hot by the factory procedure, then clear the adaptive values and drive through every gear so the control unit relearns fill times on the new seals.

The title says AF40, so will this fit my Saab 9-3?

Probably not. The DP2511 reference and the 2005-up date line up with the Ford and Mazda TF-81SC (AF21) kit. The Saab, Opel, Cadillac BLS and Volvo AF40 uses the 2006-up DP2512 kit, which we list separately. Send your VIN if you are not sure.

Does this kit include clutches or a filter?

No. It is a gasket and seal kit: piston seals, sealing rings, converter seal, pan and valve body gaskets, and O-rings. Frictions, steels and a filter are sold separately or in a master rebuild kit.

My Fusion has P0729 or P0735. Is a reseal the fix?

Only if pressure is leaking past a seal. On this transmission the same ratio codes are commonly caused by wear in the solenoid modulator valve bore or a weak solenoid. Check fluid condition, solenoid resistance and valve body wear first.

What fluid goes back in after the overhaul?

Use the fluid named in the owner manual for your exact model. Ford, Mazda and Volvo each publish their own specification for this family, so do not guess from another brand's chart.

Do I need a relearn after installing the kit?

Yes. Clear the adaptive values with a capable scan tool and then drive through all six gears with light and moderate throttle so the control unit can learn new clutch fill times.

• Aisin Harsh or Delayed Shifts: A Diagnostic Walkthrough
• Aisin Slipping Under Load: Root Causes and Fixes
• Shift Flare vs. Slip: How to Tell Them Apart
• Adaptive Relearn After a Valve Body or Rebuild