Yessireee, they're definitely not all budget converters, go take a look at their website http://www.circledspecialties.com/ ...my billet 258mm 2B multi-disc cost me $1k IIRC, but this converter is a work of art. I have pics of it in my old "FLT Level7 is finally here!" thread, in the GM Drivetrain and suspension section.

I like your combo 06Sierra2, sounds like a well matched setup IMO

Correct, the higher stalled converters don't add hp or tq, but "slip" to a higher RPM so that you're launching...or running in the meat of the powerband where there is more hp and tq. One thing to note, as the converter does it's job, it generates a lot of heat...the bigger converters like the Cirlce-D 278mm generate less heat than say my 258mm, but still generate more heat than the stock converter nonetheless. If you decide to buy a converter, I'd also invest in a good trans cooler...there is a sticky in the GM Drivetrain and Suspension section about the TruCool 40K that has so much info it does everything but install the cooler for you A large majority of us here run this cooler and I haven't heard of one unhappy driver yet

 

Besides what has already been mentioned about aftermarket stall converters; while converters come in all sorts of specifications, most of the performance converters for gasoline applications will usually also be of a smaller diameter and different materials resulting in a significant weight loss, which can result in a quicker revving engine, all other things being equal.

But take note that I used the words “most and can”, as this is not always true, yet whatever the case you don’t necessarily want to go out and purchase the smallest diameter/lightest weight converter you can find, as again while all converters are not created equal, usually you will take a hit of some degree in slow speed efficiency the smaller they get.

The main thing is to speak with the manufacturer of choice and give them the specifications of your combination and your desired expectations, to let them recommend a particular unit. They do have the ability to loosen or tighten up a converter a certain amount in any given size unit and if what you’re ultimately looking for exceeds what they can do, they will recommend that you look for a different part.

 

At 160k miles I'd suggest you add a timing chain to the list. It would probably be OK but while you're in there it's cheap insurance.

 

LS6 (ported or not) oil pump too, while you're in there

 

this page is full of sound advice imo

 

Whats the duration on thw TSP220R?