Transmission acting weird

I purchased a 2014 TUNDRA about a month ago now. I live in Branson, MO that is covered in steep hills. My Tundra drives perfect on level ground, going up hills and going down hills...however, when I top the hill and first start my decent the motor races for a second or so and then finally goes back to normal. The only way I know how to describe it is that it almost sounds like my truck is moving slower than the motor and takes a second to catch up. I will top the hill at 1000 rpm's and right after topping it the engine will race to 2000 rpm's for a second and as I start to go down it slow's back down to 1000 rpm's.

I have never experienced this in any other vehicle in my life. I took it to the Toyota service department and the "certified Toyota mechanic" there said that it is normal, he said that all Tundras do this... however, I have asked other residents here that own Tundras if their trucks do that and all of them have told me no, never.

Has anyone else ever experienced this and does is sound normal?

 

Well, not normal for any vehicle I've ever had but I don't have a 2014 tundra.

 

We'll the certified mechanic said that every Tundra does this, old and new.

 

My guess its down shifting ! Mine down shifts all the time. When it shifts down the rpms will go up. I hope this is whats happening and not trans problem for you.

 

My 2017 4.6L with low miles has always done something similar, but it's not under power like yours (large rpm increase). Mine does it when I slow down to make a turn, and the engine is essentially at idle through the turn. When I want to resume speed after the turn, it seems like the transmission hesitates in making the downshift, and the engine over revs until the transmission "picks up the slack" and shifts. Annoying as heck for a new $40K truck.

So, the mechanic isn't lying, but he is downplaying the problem imo. It is NOT normal since Hydramatic transmissions were first invented in the forties, or Toyota is building a bs transmission.

Both of us should take the time to check our transmission fluid level...short fluid fills from the factory have been observed. If your 2014 has never had a fluid change, you should consider doing the full transmission drain procedure below (tricky, you'll need some skills), and using Valvoline MaxLife Synthetic ATF to refill. The video procedure is for the 5.7L with tow package, but the procedure can to be revised slightly for non-tow package or 4.6L.

https://www.youtube.com/watch?v=fLVZSoKbyZ0&t=200s

 

Thanks! I actually just bought it a month ago as a "Toyota Certified" truck but kept finding stuff wrong with it (body wise) come to find out the dealer got mine mixed up with the 2012 they had so mine was never repaired or even inspected... they wasn't even supposed to sell it yet. The only good thing is that everything gets fixed for free right now during this inspection and the motor, trans and electrical is covered completely until it's paid off... and the guy is throwing in new running boards.