Originally Posted by
Xfingers
If Tanner_M's problem is valve body wear, then a lower viscosity ATF is probably gonna exacerbate his poor shifting. DEFINITELY first make sure you've got the proper level on the dipstick. If your car shifts fine the first 10 min. of driving, but then things start going to hell once the fluid warms up (thins out), this could be a very good sign of solenoids/valve body wear based on my own experience. Also, before I replaced my VB, I was getting the P0740 code.
I think Tanner_M's problem is likely Valve Body wear - sure sounds like it.
However, since the fluid level on this can be a bit tricky to get correct, I would encourage him to eliminate that as a possibility first. Always check the basics before diving into a diagnosis...
Current Fleet:
2016 Tundra Crewmax 4WD 1794
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