2G DSM W4A33 End Clutch Rebuild

This is the Overdrive clutch pack. If your car free revs or slips in OD, this is part of your problem.

I have more detailed instructions on my KM-177 transmission page. The instructions are exactly the same

KM-177 End Clutch Rebuild

Parts Needed:

One of the seals requires a press to get replaced (the large End Clutch Piston Seal.) It CAN be done without a press, but it is a major pain. The main seal to replace is the small one with a metal case around it. These are known to fail and leak off pressure from the End Clutch. This in turn makes the clutches slip and burn the transmission fluid. The burnt fluid no longer lubricates properly and all of the other parts (including the valve body) wear out prematurely. When caught in time this is repairable. Otherwise, start looking for a new transmission.
Part Description Mitsubishi Part Number (if applicable) Price
FR, RR, and End Clutch Seal Kit Entire OEM End Clutch Seal Kit and more. You can also contact the aftermarket companies below to get just the End Clutch seals. MD997953 ?
Small End Clutch Seal Small oil seal that seals the end clutch to the oil pressure supply. (Metal clad seal) included in kit  
Piston Seal The large oil seal that goes under the pressure plate and seals the entire End Clutch Piston (outer edge) included in kit  
Ring "D" O-ring Inner Piston O-ring (inner hole) included in kit  
End Clutch Cover Seal Seal for End Clutch Cover on transmission included in kit  
End Clutch "Frictions" If your Overdrive was slipping at all, r eplace them. W4A33 transmissions need 4 friction rings. Most transmission supply stores carry standard frictions. Plus OEM is another option. IPT carries performance friction options. I just went with standard Borg Warner frictions and am very happy with them. OEM or Aftermarket $1.50+ each
End Clutch "Steels" The "steels" steel rings rarely need replacing. Inspect them and replace if necessary. They are usually replaced because they are warped. If yours are straight and look good, they do not need to be replaced yet. W4A33 transmissions need 4 steels. Most transmission supply stores will carry them. OEM is another option. OEM or Aftermarket $1.50 each

Removing the End Clutch Cover

Remove the inner-fender liner and drain the transmission fluid as much as possible before starting this process.

Remove the End Clutch Cover

Clean around the End Clutch cover as much as possible to keep from getting dirt in the transmission. Then remove the four bolts holding the End Clutch cover on.

There is the End Clutch - It slides right off of the transmission splines

Front of the End Clutch Assembly

Back of End Clutch Assembly

Page 1 - End Clutch Removal

Page 2 - Disassembling the End Clutch

Page 3 - End Clutch Rebuild


Places to order End Clutch parts from:

Note, most shops have many more parts than are listed on their websites. Give them a call.

Most helpful and informative

Import Performance Transmissions

Other Sources

Transtar Industries

Transmission parts distributor

Makco Distributing, Inc

Transmission parts distributor.

Trans Go

They sell milder shift kits. Not recommended for turbo applications.


Alto USA

Give your local Alto Red Eagle distributor a call for the friction parts.

Just pick a region in the US.

Borg Warner friction parts also seem to perform well.