Problem: My 1993 940 transmission filter keeps getting clogged up. This is the 5th time in 3 months. I've flushed it using the techniques on this site. I installed an in-line filter 3 weeks ago and have had two in line filters clog up since. Once I replace the in-line and/or regular tranny filter, it runs pretty well until the next time it clogs up. When I remove the pan the oil is dirty, but when I remove the filter, bright red fluid runs out of the tranny.

History of vehicle: Bought it used on Ebay last year. After driving it home to NC from PA, found out it had a head gasket leak and engine oil was in the coolant. I had this fixed. I noticed the transmission fluid was a tan color. I learned that the radiator was broken inside and the oil/coolant mixture that was in my radiator got into the tranny. What is weird is that the transmission ran great even with that crap in it. The trouble started 3 months after replacing the radiator and flushing out the transmission. I replaced the tranny filter and it had what looked like old oily pasty powdery substance clogging it. This filter lasted about 3 weeks and clogged again. Now it clogs every week or two. The last two in line filters I used were for trannys but looked like a fuel filter. I'm getting a screw-on type that is easier to replace.

Questions: Is it possible that the black goo that eventually clogs the filter is left over residue from the cross-contamination from the head gasket and radiator problem? Should I get a professional transmission flush or will this ruin my transmission?

Once I change out the fluid and filters the car runs great except that it has to run about 2/10 of a mile before it will go into 2nd gear when it first starts. Could this be caused by residue in the valve body? Any help would be appreciated.