hello! my truck has a 4l60e and today it got randomly colder then the past couple weeks here in canada and the temperature was around -20 celcius which is -2 fahrenheit i believe.
i remote started the truck and got in 2 mins later and started driving, it reversed fine and was normal for the first 30 seconds, when i came to a complete stop and left the parking lot, the revs would go up but the truck wouldnt move so i shifted into neutral and back in drive and same thing, revs would go up no movement. i then shifted into park and back into drive and it was good to go but i noticed it wouldnt shift, it seemed to be stuck in gear 1/2 but my speed was only 40km/h ish so i pulled over into a parking lot and left it running while i went inside a store and came back after 10 mins and everything was perfectly fine, shifted good and normally. the past weeks hasnt been that cold so i have not noticed this behavior in a while.
about 3 weeks ago i had my fluid changed and the old fluid was still red, and did not smell burned or anything, i did the pan drop filter change and the cooler line fluid exchange. after the fluid change i have been monitoring the level and no leaks and its at hot on the dipstick when the tranny is hot.
i noticed about 4-8 weeks ago this same thing happened but it only happened when the temperature was -40 celcius which is -40 fahrenheit as well, and it made more sense when the temp was that cold because thats pretty cold but if it starts happening now at around -20 celcius then thats gonna suck for me because canadian winters are always around this temperature.
what do you think i should do? is this just due to an old transmission (245,000km on it) or is there something loose/needs to be replaced? the new fluid that went in was the ac delco dexron vi