Too late for my Rear Spring TSB?

Is there a -K after the numbers on your 3 pak factory springs? Mine (2010) has the K and it doesn't bottom out... My '05 did.

 

So it's not definitive

 

yes that is a definitive way to tell if the springs are TSB springs in the US.

I think some trucks in Canada have come out with the 4 pack.

And I have read several people say the same thing David K said above.....and I've read pages and pages of debate as to why....to no definate conclusion.

 

WELL....MY TSB LEAF PACK HAS BEEN ORDERED!! Thanks to everyone who helped and put in their advice on how to sweet talk the stealership.

Basically what it came down to was my Toyota Care Extended Warranty since I was sittin at 41k miles (which is over the 36k manufacture warranty)

 

^good deal!

 

My '09 leaf pack was pretty decent as well. I do a bunch of hauling with this truck since I traded in my old F250 that I used for bark and rock runs.

The four leaf TSB helped improve payload capacity but it wasn't that big of an improvement over my original three leaf setup. I am adding another leaf to see if that helps and possibly I may be going with airbags.