I'm posting a link to a friends site. He's located in MN, but ships parts nation wide. His name is Andrew and he parts out 2000+ SSEi Supercharged Bonnevilles and has a LOT of parts for these engines (and probably 4T65E-HD tranny's too). I've known him for a few years now and have bought a few things from him. His pricing is very reasonable and the shipping is fast and affordable. He WILL NOT sell any "questionable" part. It has to be perfect or it gets scrapped. He's really a great guy to deal with and has always been very fast with replies for me. He has a huge customer base at the Bonneville sites, and I thought I would share a great source for supercharged parts for all you 3800 nuts out there
Examples:
Supercharged connecting rod/piston assemblies: $10 each
Supercharged ECM's: $60 each
Supercharged wiring harnesses: $75 each
Here is the link to his site with all the contact info.
http://www.bonnevillecarparts.com/I'm pretty sure he has at least a dozen of any stock part anyone could ever want for these engines. Along with anything anyone could ever want from a Bonneville (RKE modules, fuel pumps, axles, fuel rails, injectors, superchargers, exhaust manifolds, ect, ect, ect). You name it, if it was part of a Bonneville, he probably has it! Highly recommended! He is always my first stop when looking for 3800 parts, and he has never told me he doesn't have it.