It's like anything else aftermarket. Go with a respected and highly-rated company, and you'll usually get a product that will satisfy your needs/wants.
GM had boxes built for zillions of vehicles but cost considerations were always a factor. While fairly durable/reliable as-is, they definitely could use improvements/tweakings to get them to tip-top operating conditions. This is where those specialty companies come into play that deal specifically in steering and suspension. I think there's some that even build their own boxes from the ground up. Use their knowledge. It's like going to Dave Husek for a TH200-4R build. It'll come out way better than a stock 200-4R could ever be. May have to spend a little coin, but buy once, cry once.
GM had boxes built for zillions of vehicles but cost considerations were always a factor. While fairly durable/reliable as-is, they definitely could use improvements/tweakings to get them to tip-top operating conditions. This is where those specialty companies come into play that deal specifically in steering and suspension. I think there's some that even build their own boxes from the ground up. Use their knowledge. It's like going to Dave Husek for a TH200-4R build. It'll come out way better than a stock 200-4R could ever be. May have to spend a little coin, but buy once, cry once.
