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Hey everybody, I recently bought my first truck, 2012 tundra 4d 2wd with 155k miles (I’ve had many Toyota’s in the past). It seems I’ve run into some transmission issues. I would say 90% of the time the truck shifts almost perfectly with no effort, but I’ve noticed that sometimes going into 3-4 gear around 40-45 mph, it will go into gear and the vibrate for a couple of seconds. The vibration feels like it’s coming from down under and I don’t feel it in the steering wheel. Also, very rarely, it will kind of clunk and lag into a gear if I’m accelerating slowly (gotta conserve gas on these suckers). If I really press on the gas it will give me a light clunk as well. I called a transmission specialist and he told me to come in immediately, but I’m not always keen on auto shops because I’ve had multiple bad experiences. Figured I would come here first. Anybody got any ideas? Any advice would be helpful!!
 

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I have a 2011 crew max with 116K miles, it does something similar. Shifting first to second it feels like it drops into the gear instead of a smooth shift (only sometimes, not all the time). Everything else is good except occasional shudder around 45 when shifting under light load. My truck has the driveshaft bump thing, which from what I've read is the result from binding at a slip yoke in the rear drive shaft. A lot of comments I've read about the driveshaft bump have mentioned occasional shudder associated with it too. If i grease the U-joints real good, i stop experiencing the problems for the most part.

Research I've done indicates a bad gear or a torque converter on its way out is the worst case scenario, however I am hoping to get the driveshaft replaced to see if the the binding is causing an occasional bad shift. My plan is to have this done at a Toyota dealership with a transmission pan drain/fill with filter replacement, although the time frame is up in the air right now.

I bought the truck from a toyota dealer, I guess they had the driveshaft greased up real good because we didn't notice anything during the test drive/first few weeks after purchase. If it does turn out to be a transmission problem at least it seems to work fine for now.

Let me know if you have the driveshaft bump, this will help in my notes on the issue.
 
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