start calling your local transmission shops, say you have a General Motors 4L30E tranny and want to know what their flat rate rebuild price is with a year or so warranty. $1250 is a good number. Do not tell them you have an Isuzu VX upfront. It will be a totally nightmare for them to drop the tranny and most bolts will snap off rather than screw off. If they don't know what a GM 4L30E is, hang up and move on to next shop. 4L30E is the weakest possible transmission that could have been engineered into our VX's and are all doomed to total failure. It was originally meant for Chevy Chevette tiny cars, not a 4WD all the time. E gave it 1 more gear but no more durability. Also have them install an real oil intercooler, about $125 and have them totally bypass the radiator's oil coolers as it's location and design is a total joke, I have seen the cross section, it is more likely to heat up the oil rather than cool it. So bypass it totally. Been there, done that I have.