Magnus

While shifting through gears 1st - 3rd there is no issues. When the vehicle attempts to engage the 4th gear, the engine revs up a bit, but it is not excessive revving, feels like computer rev matching. During this time, there is no slippage, no grinding, no other notable or noticeable problems. The gear simply does not engage. After a few moments (3-5 seconds) it feels as though the computer recognizes a fault, and attempts to engage the last known working gear... Which unfortunately is often 2nd gear as it seems the computer will skip 3rd gear depending on acceleration applied. This causes a jolt, but feels normal for an automatic getting dropped into a lower gear while going a high speed for that gear. After some looking around, I read somewhere that it's possible this was a problem with one of the solenoids. I was curious if anyone else has had this problem, and what they did for a fix. I broke the vehicle down where needed to get into the solenoid valve body area. All I am waiting on is to replace them, but I didn't want to make a purchase if someone else was to say "WAIT, I DID THIS AND IT WORKED". Call me a rookie, I deserve it -- but when I went to drain the transmission fluid It was nasty, and smelled terrible. Could this cause an otherwise operable solenoid to temporarily malfunction? ​Here is the eBay page showing the solenoids I'm looking at: http://www.ebay.com/itm/like/132018268320?lpid=82&chn=ps&ul_noapp=true