[ColoradoSilverado]

On another note: over the past couple of years I've had the issue that it wouldn't take of in D or 3rd but will in 1st or 2nd, probably happened a total of eight times or so, in D it would go, but very very slowly, a little better in 3rd and fine in 1st and 2nd, I just take of in 2nd and then manually shift up. Every time this happened it would do it for the rest of the day but the next day it would be fine and then it wouldn't happen for months. It happened again last Friday but this time it didn't go away until Wednesday when I left work, now it shifts fine again?? Any ideas? Changing the fluid and filter is probably not the solution to this problem but it's been too long anyway so it can't hurt. Truck is long paid for and like to keep it for another while, it's my daily driver for my business and I love it even though it's outdated.