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"G. M. THM 400 automatic transmission steel clutch plate finish"



2004

I'm rebuilding a G.M. THM 400 automatic transmission. Instructions are to hand sand steel clutch plates to an 8 to 30 microinch finish. Sanding parallel to plate rotation using 120 to 220 grit emery cloth or sandpaper. I've found a table explaining various grits & types of sandpaper, but no data correlating grit to microinches. Thanks in advance for any help or input.

Marcel Service
mechanic - Covina, California, USA
^


2004

32 is about what you get with a reasonably decent boring operation. A decent honing job should yield about an 8 finish. For a little more info, see question and responses to #26557 on this website

Tom Gallant
- Long Beach, California, USA
^

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