Did you clean out the transmission cooler per Sun Valley's instructions? Seems like a good thing to do given the construction of the cooler with all those closely spaced pins which could trap debris and decrease cooler efficiency.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

No, but you are right that it would have been a good idea. Just ran out of steam and wanted to get job done. Lot's of other jobs to do on cars and house before winter sets in!

The transmission pan was spotlessly clean and I didn't like messing with those hose connections - Brass union nut onto aluminum threaded nozzle seems kind of place where threads could easily strip. On the side I fixed, the thread was already slightly damaged, but I used the new steel nut as a die and was able to get past the bad thread.

It would be interesting to confirm what metal Behr and Nissen use for the cooler and it's nozzles on replacement rads. I know it looks like brass, but so did the cad plated OE nuts and washers I bought.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5