why does Toyota keep using a driveline that causes vibration?

Heck if I know!
My 2006 didn't have them vibe.
My 2013 does have a slight driveline vibration.
It gets a little worse when towing.
I'm gonna have the dealer check it out on Weds along with looking into another irregular noise the truck has now developed.
The 1/4" tubing trick in the grill weatherstripping has seemed to tame the whistle though.
Been driving a Toyota truck since 87...this is the first one to kinda irk me a little...still I really like the truck, its styling, its resale.
Toyota does step up & does a good job with the tsbs & addressing issues.

 

I was speaking Gas - Gas comparison, yes I wish Toyota would offer a Diesel but around here the Diesel is usually 30 cents more per gallon then Gas which off sets the better mileage.
My family has had both good and bad experiences with Ford quality yet they keep getting them and up till my Toyota this year I was also, however over all quality by owners in the US show a distinct quality difference between the two.

 

sorry for your troubles.

I have been in a sinking boat before...I was quick to trade-in.

 

Well luckily as others have stated Toyota is good with the TSBs they issue. However, it is duplicated the problem is that I am afraid of. I won't be quick to trade in, but it is a hassle having to drive 150 miles one way to get to the Toyota dealership.

It sucks bragging about my truck when people with full size trucks try and knock it, and then my truck goes into the shop with only 3 months of life twice now..it will be a 3rd time on Saturday.

 

Based on what I know, that isn't true - the bean-counting starts well before Toyota selects a supplier and is integral to the design process. And the money spent for design improvement is even less, which explains why sometimes TSBs don't solve a problem right away, requiring 2-3 P/N rolls (think chirping HVAC blower).

Think about the typical problem-solving cycle at Toyota:

1. Customer complains to dealer.
2. Dealer tries to troubleshoot problem. If successful, dealer feeds info back to Toyota USA.
3. If Toyota USA gets enough recurring complaints on the same part from dealers, they relay the info to Toyota Japan for solution.
4. Toyota Japan engages/coerces supplier for design improvement.
5. Supplier comes up with improved design, tests it and cuts into production.

The time from steps 3-5 can take a good two years given the quantities involved. And this is for basic stuff like chirping blowers and rusting chrome bumpers. Then there's up to half a year between a vehicle rolling off the assy line and you driving it off the dealer's lot.