I have an '86 Bronco with a 351w 4 speed transmission jumps out of third gear, you have to hold gearshift to keep it in gear when driving in this gear. I am not sure which trans I have tag off of trans is EOT3 AA is this a t-18 t-98 or t-19, and any input on it jumping out of third gear? I figure it might be the synchronizer sleeve. Thanks for any input!!