I agree. the very most I'd put on a truck is a 2" bl, I've got a 3, but thats because the PO put it on.
As for your question, mine were poorly extended, and I actually had one of mine break on me (not good).
I welded it back together, and then cut a 3" piece of pipe (3/4" I think) longwise, and then welded it around the shifter weld. You can do the same, and if you measure properly, you can get the shifters to the right height where the boots fit around the shifter properly
