Last time I went to Costco they install a completely different tire than I had ordered. Had to wait another hr for them to fix their mistake. Atleast they have free road hazard warranty.

I just don't think that's possible. Even with an air impact. The drive shaft would have a natural gear reduction in torque of 4:1. So you'd have to have an extremely high amount of torque on a wheel to damage something upstream of the diff. It takes a LOT of effort to break the driveline components on these. The engine in 4Lo will apply as much as 10,000 ft/lb of torque on the axle shafts. And they won't break. I don't see how anything related to lug nuts could possibly get close to that. The lug nuts will break off at less than 200 ft/lb. It's multiple orders of magnitude off of the realm that it would need to be in to cause damage.

The hub nut that holds the CV shaft in the hub assembly takes more torque than the lug nuts can withstand before breaking. IIRC it's something like 250 ft'lb. If it were possible to break or damage the driveline - every time someone re-installs a front CV they'd be damaging parts or risking damage. You never have the wheel on for that process. You can't. The dust cover still needs to be installed before you put the wheel on.

I had 275/70/R17 Ko2 put on at Costco,I have been buying tires and having them balanced and rotated for free for years, they allways Torque to spec.and recommend re Torque after 40 Km.which I do myself.They also fix punctures free.Good service in my opinion..

They would have no concern with that tire as it is an E with a load rating in excess of the stock 113, just as they would have had no issue with the 265 in an E load.

I'll say again that all of the above have a safety margin as Toyota ships the same vehicle in Limited trim with a 107.

^
And that has implications for what the actual needed safety margins are per tire when running LT. There is a whole thread about LT tire pressures but it is based entirely on the notion that 113 needs to be met. Once 107 is taken as the baseline, things change quite dramatically when it comes to the needed LT pressures to meet the safety margin.

Exactly. Nobody seemed interested in considering that when I made your point in another related thread on LT pressures.

My guess is the op is confused on what he was told

costco idiot torqued the nuts with the wheels OFF THE GROUND !!! the wheels were wacking back and forth ... drove home and had vibration .
I did the U joint repair bearings looked good not rusted but had damage on the needle bearings.. you torque wheels on the ground they are not professionals. brake cleaner is acetone spray it on your paint then you will see how the idiots did the damage.
my hubs had small amount of anti seize on it paint like amount very little so they sprayed the steel hub and then the painted aluminum wheels ..did not use rag just sprayed the sh*t of it ..

Costco did a pretty good job when they got started in tires, but have been going down hill for the past few yrs.

Thank God for the 35 yr. old mom-n-pop tire shop in the small town I live in.

Your junk wasn't damaged by the tire install. There's no possible way a u joint is damaged by lug nut install. not to mention that the tires all free wheel off the ground unless you have diff locks. This didn't happen. It's not possible. There's lots of ways to screw up a tire install, but this isn't one of them.

But at the end of the day, what did you end up going with?

The hot dog?
The chicken bake burrito roll thing?
Or the very berry sundae?

There's no way OP went to Costco and didn't at least get one of those things, even if their tire shop wasn't very helpful!!

We have a chain called les schuab... theyll throw anything on cheap and always offer to help out with flat repairs

So they have more tire guys then check out staf......

Had the same thoughts myself about load and speed rating, til i checked out the oem spec. Total garbo OEM Tires