I just had a local shop do a drop and rebuild for $1250, I ended up at $1500 cause I actually needed a case; the 4L30E is a known weak tranny and was never intended for 4WD all the time, the intercoolers built into the radiators are a joke, they do nothing, auxillary intercoolers are cheap and easy to install; advice to all, call local shops, don't mention you have an Isuzu, just that you have a General Motors 4L30E transmission that need the master overhaul kit and solinoinds installed; tranny rebuild, gather prices and go see their operation; then need lots of space and people with experiance to do the job, guy that did mine had been doing since he was 14, and he was in his 50's or 60's, I shift like Lexus again, shifts better than when I got the car! I had them take off my entire exhaust system to so I got strip rust, prime and paint it all! Preserved forever now!