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Anyone had success with flushing an automatic transmission? 200 1985

posted by  Asudad on  Fri Jan 16 18:28 CST 2004
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I would recommend flushing transmission with 1/2 can of Berryman's Chemtool B-12.

Start with transmission cold and beging cycling upshift and down shift to work it thru the valves. After engine and tranmission warmed up for appx 20 miles. Add the other 1/2 of the can, repeat driving.

If this corrected the slow shift/erratic shift, drain the ATF and add fresh ATF.


This has saved many transmissions that at first seemed to need overhaul or replacement.

One word of warning, never add more that 1/2 can at a time or it will boil the ATF out of the transmission vent.






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