In Feb 2012, I replaced the AW70 (>200,000miles)on my 89 740 sedan with an AW71L (120,000 miles) from the Boneyard. Worked great at first, then started slipping at highway speeds. Since son had the car, he opted to have a shop replace the filter and replace the 4 month old fluid. Last month, when I got the car back, I flushed the tranny via the cooling line ( as per FAQs). Now not shifting into 2nd and slipping in first gear when cold (at first startup). I removed the stop crimped onto the kickdown cable and it shifts smoothly once it is warmed up. But still it still stays stuck in first at startup, and jerks out of gear at a stop.
Should I do another filter change or just give up and replace it with another donor tranny from the Boneyard. I have found an AW70L on a 90 740 with 130,000 miles for $129. Just have to pull it myself (with help from another BBer).
Thanks for any suggestions.