Yes as far as I can tell the heads are the same. I've confirmed this from a site I found comparing the two and also the fact that both part numbers are the same.
4T60-E HD - Same as 4T60-E except with a few heavy duty parts (mainly final drive gearset) for supercharged 3.8l V-6 application. This is the only reference to the specifications I've been able to find, at all! All other specifications refer to the (presumably) standard trans. Thats something that'll have to be looked into further.
I've never priced it but I can't imagine the pulley brackets and such costing very much. I can't imagine the PCM being that big of a deal either, nor the need for a custom one. I'm not saying cut corners but many of you do the boost control bypass and never think twice about it...well you've nearly reduced the PCM to that of a naturally aspriated.
A question I do have, how different is the connectors for the PCM? Is there a major difference in that you couldn't simply replace the na PCM with that of a sc? Obviously it'll be without the bcs, but is it even possible? I've read once the proms are the same part number so it got me wondering. Other parts would also have to follow, namely fuel injectors and MAF sensor but that was a given.
The MAF is what basically controls the injectors, so it would either have to be swapped or a a/f calibrator put in place. I posted instructions on how to build the Tech Edge unit in another thread..if you're low on money but rich on knowledge
I'd say so far
in the whole scheme of putting forced induction on a naturally aspriated we have it about the easiest. Most others have to deal with high compression ratios, weak bottom ends, major clearance issues, and can't go to a junkyard and grab almost every part they'll need to do this. Heck 95% of the parts are probably for sale on this forum right now. I've seen several posts offering these parts up on the cheap. Heck I'm looking at buying another supercharger for $75, the lower intake isn't much and neither is the injectors or PCM if you ask around...The brackets? I'd think most that are scraping their engine would love to make a buck off that because who else is going to buy it. I'm rambling though haha
sooo much more homework to do.