Want a more highway friendly setup than the 3.91's I currently run in my 8 3/4. I want to go with 3.23's but still have limited slip. I have a 742 case 2.91 open that is original to my car sitting on the bench. I think I want to have it built locally- gear swap and suregrip install.

I'd like a recommendation for a shop that can do this on Long Island. suffolk county preferable but anywhere on the Island will do. I'm not made of money but cost is pretty far down on the list of priorities for this particular job. My #1 concern is that a grown up does the work and nothing goes bang bang when it's done.

I've looked into just finding a 3.23 suregrip locally but not easy to find. I'm hesitant to buy one online either from the usual suspects or an ebay seller. It can be a disaster if there's a problem with shipping or even worse, I get put on ignore cause they got my dough already. .