Looking for a T100 ECU, I picked up a T100 for a winter beater with a bad ECU. It's got the 3.4L, 4x4, and manual transmission. Based on my research late 97 and 98 are interchangeable. I don't have it in front of me but I can double check the part number with yours. Would like to keep it $100 or less, much more and I'll probably just buy another T100 for a parts truck. I have a couple automatic trans 3.4L T100's if you want to do part swap/trade. Also have 86-99 pickup/tacoma parts, 92-99 camry, 94-97 corolla parts.