I know a great shop in Elgin, He's been doing all my trans work since 1990 When he was in the city. . He rebuilt the 4R100 in my stacked chip, propane juiced diesel tow truck, which held up until after I traded it in. The shop is Twinn auto, 1337 Dundee rd., Elgin IL. They are one block south of I 90 on route 25. Phone is 847 488-0000 ask for Nick. I still do his towing from the city to him. Lloyd