Precision 4 wheel drive is an excellent place to get work done. I had the guy regear my 96 tacoma and install a trd limited slip differential. I dont know how much it would cost for the install, but the guy has very resonable prices. The shop is located in clackamas on the way to mt. hood. the phone number is 503-722-0226. Do not go to central 4wd in portland. I waited a month for them to order parts for me and the day i showed up for the install the mechanic didn't show up for work and they didn't know where he was... So I told them I would go elsewhere and am happy i did!