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Sighs.....the saga continues. For those that are interested and are experiencing the same shifting issue as me here is an update.
After continuing to complain about my low speed shifting issue my service department took my truck in again. This time the plan was to add more transmission fluid. According to the service manager some new trucks were coming from the factory with the level near the minimum level and topping them up solved this shifting issue. Well it seems that the transmissions in these trucks is not easy to top up this level. It needs to go onto a hoist and fluid is added from underneath. The tranny is a completely sealed unit now. The little bit of good news is that the service manager at my dealer took my truck out and he was able to repeat what I have been telling him for a month. So at least he knows I am not making this up. Anyhow, fluid level topped up now and my truck still does this off shifting issue.
For those of you with a 4.6L 2010 Tundra here is how I have been able to get it to repeat the issue. When the truck is cold (more repeatible when cold) I drive about say half a block. Let off the gas or brake down to about 20kph turn a corner and when i get back on the gas the transmission acts like it is neutral. The engine will rev because I am trying to accelerate and suddenly the transmission dumps into a gear. So to me it seems like it's a downshifting issue while rolling. If I come to a complete stop everything is fine. I have done some short trips to the store or to work where it has done this same thing 3 times in a row.
Interestingly enough while my truck was in getting the tranny fluid topped up last time I was given a 5.7 Tundra to drive. Totally different truck to drive. The shift points are much more intelligent.
I know Toyota did some funky crap with the shift points in the 4.6L to try to extend fuel economy but after driving this truck for a few months I can report quite honestly that it doesn't work. I find the initial acceleration of the 4.6L to be way to sensitive, it ramps up gears way too fast and once you are cruising around at street speeds it seems to take alot of foot feed to get it moving. It would rather lug than drop a gear to accelerate.
The 5.7 I drove was nothing like that. Initial accelerate was smooth and I didn't have to be so cautious then once I was moving it was very eager to drop a gear if I wanted to get up and go. If Toyota did all of this to try to make the 4.6L more economical they failed miserably in my opinion. My fuel economy in the city is no where near what they rate it at in their specs. I have done burned off a few tanks of fuel in the city where I babied it big time and still not even close to the rating they give this engine.
You know I bought the 4.6L because I really didn't need the extra HP and I was hoping to get a little better fuel economy in the long run. In hindsight I probably should have just gotten the 5.7L. I think they rushed to get this 4.6L out for sale because I know I am not the only one having these problems. I do like this truck don't get me wrong, I just hate having these issues with something we paid so much money for. Its like buying a brand new house that comes with a leaky roof. If they ever get to the bottom of my shifting issues I will let you guys know.
Last edited by SHO_Maniac; 12-22-2009 at 03:58 PM.