This is a T5 World Class 5-Speed Transmission Rebuild Kit This is a rebuild kit for a 1987-93 Ford T5 Transmission in a Mustang and 1987-88 Thunderbird without a synchro in reverse and with the M88010/M88048 Input Bearing & Race. The T5 Transmission will be cast 13-52. Please idenitfy 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 kit comes with all the main roller bearings, seals, gaskets, synchro rings, and a small parts kit. (Small parts kit includes snap rings, thrust washers, needle bearings, etc.) There are no springs and keys in this kit! I do sell them. If you think you need them, let me know. They are $15 for the whole transmission. I will add them in the kit for just the cost of the springs and keys if purchased and sent along with the kit.