was just wondering if the issue im haveing could be the torque convertor lock up and unlocking? it seems like it downshifts revs a little and then kinda slams into gear. not real bad but that what it seems like. if i take the od switch and turn off it doesnt really do it . i have no codes other than 33( egr) my old trans didnt do it but the codes i got on it then said torque converter clutch excessive slipping etc. even blew fluid a cpl times from getting hot. maybe converter wasnt locking up now it is and i can really notice it at lower speeds with the big tires. also where do i get the 15 tooth speedo gear and how hard to replace? its on the back of transfer case.