TF-80SC Clutch Drum, used and ready to install. Fits the TF-80SC. Ships fast from the USA.
This is the C1 clutch drum, the 1-2-3-4 forward drum, for the Aisin TF-80SC six-speed transaxle and its Ford and Mazda twin, the TF-81SC. Volvo, Saab, Opel and Land Rover call the TF-80SC the AF40 or AM6; Ford and Mazda versions are known as the AF21 and AW6A-EL. It is a used, original Aisin drum of the 6-clutch type, cleaned and inspected. If your six-speed slips or flares in the lower gears, will not pull from a stop, or came apart with a burned C1 pack and a drum that is scored or cracked, this is the housing you need.
The TF-80SC builds six speeds from three clutches, a 2-6 band (B1), a low/reverse brake (B2) and a low sprag. The rebuilder's parts catalog labels the C1 pack the 1st, 2nd, 3rd and 4th clutch, and this drum carries it. C1 is the forward clutch for the bottom four gears, so every launch and every city-traffic mile goes through this pack. Apply oil reaches the C1 piston through two sealing rings between the input shaft and the drum, and a molded rubber balance piston inside the drum cancels the centrifugal pressure that would otherwise drag the clutch at speed. The valve body meters C1 apply through its own linear solenoid, labeled SLC1, and a C1 clutch control valve. A worn ring land, a leaking piston, or a scored plate surface lets that pressure escape and the pack starts to slip.
The same complaints often come from the valve body. Sonnax lists a worn C1 clutch control valve bore as a cause of a burned C1 clutch, delayed forward, coast-down neutral, flare shifts and gear ratio codes. That means a new drum can fail again if the bore that feeds it is leaking. Check fluid level and condition, read codes and confirm line pressure first. Our Aisin slipping under load guide shows how to tell a pressure loss from a worn clutch, and our general slipping diagnosis guide covers road-test patterns. If line pressure is good and the slip stays in gears one through four, pull the unit and air-check C1. Then check the drum's sealing ring surfaces, piston bore and plate splines.
The listing names both the TF-80SC and the TF-81SC, which the industry also calls AF40, AF21 and AW6A-EL. It is a 6-clutch drum; the catalog lists six to seven C1 frictions depending on version, so count the plates in your old pack before ordering. The two transaxles are not identical inside, and TF-80SC and TF-81SC overhaul kits are sold separately, so compare drum height, spline count and the clutch count against your old part. If you are unsure, send your year, make and VIN and we will check it. Find the rest of the parts for this unit on our Aisin parts page.
| Fits | TF-80SC |
| Part type | Clutch Drum |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
The listing names both units. Their internals differ in places, so compare drum height, spline count and the number of C1 clutches with your old drum. Send your VIN if you want us to check it.
It refers to the number of friction plates the C1 drum holds. The parts catalog shows six to seven C1 frictions depending on version, and this drum is the 6-clutch type. Count your plates before ordering.
C1 is the 1-2-3-4 clutch. It is applied in first through fourth, so a failing drum shows up as slip or delayed engagement in those gears while fifth and sixth hold.
New C1 frictions, steels, piston seals and the two input shaft sealing rings at minimum. Inspect the C1 drum bearings, and have the valve body's C1 control valve bore checked so the new pack gets full pressure.
Most applications call for a JWS 3309 type Aisin fluid, but some vehicle makers specify their own. Use the fluid listed in the owner's manual and reset adaptations after the repair.
