Ford T5 World Class 5-Speed Third Gear 27 Tooth This 3rd gear fits Various Ford Applications (Except Thunderbird) Tooth Count 27 The T5 Transmission will be cast 13-52. Please identify what you have! Non World Class units have all brass synchro rings. That is not what we are selling here! World Class transmissions have fiber lined synchro rings for all the synchro rings except 5th. This 3rd gear is for the World Class type. If you need anything else for your T5 rebuild; Complete Rebuild kit, Gears, spring and keys please see our store.