I will tell you this.
I bought two used trucks from diiferent dealers during the late 90's.
Both were 360's and had been reflashed and the plate gaskets changed.

Guess what I found???? Both had the work done but both had the crimp washers still spinning on the bolts. Apparently the tech torqued them down to spec but was asleep.

The bolt holes were not drilled deep enough!!!! Bolt bottomed out first.

I was quite impressed.