Converters fail after fluid change
After fter hearing about a local transmission shop’s dilemma, the TCRA was asked to help solve their problem. It appears that torque converter failure was occurring on both used and rebuilt transmissions shortly after the transmission had a fluid flush.
After careful inspection of one of the converters, it was determined that the harsh chemical cleaners used in some flush systems may cause premature damage to the clutch liner and possibly transmission clutches.
If indeed you choose to flush transmission cooler systems with a flush machine, make sure there are no solvent-based or petroleum distillates in the formula. Petroleum mineral oil and natural bean oils combined with phosphoric acid esters or sulfur-based products work well and will not upset the careful chemical balance found in modern transmission fluids. The result will be clean cooler systems without the chance of internal part damage. It is still recommended that the filter be inspected or replaced at the time of the fluid flush,
Posted on 10-22-2006