Hello. I drive a 98 gs 300 w/ 110k miles. Lately the transmission would slip/shudder on the highway if I was going about 75 mph and going up an incline. I changed whatever fluid was in the pan and it reduced the problem but it still happens every couple of inclines as opposed to every single one. What would cause this? The fluid was pretty dirty when I changed it. I plan on a few more fluid changes to switch out as much of the fluid as I can.
So what would cause this to happen and is this something I should classify as a warning to a major failure. Thanks Ray J... or whoever else decides to help. Thanks.