#transproblems

While towing my boat my truck gets to a high RPM (4,000 to 4,500) before shifting and will not get out of 6th gear unless I let off the gas and let it down shift. I have video of me going 55mph in tow mode with cruise control set and it wouldn't shift up, it stayed at 4,000 rpm until I let off...

Let me start off with this...I bought the truck a month ago, brand new, it has 900 miles on it and a ton of problems. Any input would be great!! When driving around 25-40MPH, I get a vibration (almost like I’m going over a rumble strip) I take my foot off the gas and it goes away. Sounds to me...