Yes, 7.5" and 8.8" axles are swappable. As long as they both are 28 spline. Yes there is a 7.5" t-lock rebuild kit... the 8.8" ford part # is: 8.8 T-Lock rebuild kit M-4700-B Includes: Clutch Pack, Shims, Friction modifier and instruction kit. Fits all 8.8 T-lock Differentials T-lock Rebuild kit M-4700-B $44.95 I'm not sure about the 7.5" part # but any ford dealer should be able to order one up for you. It should be about the same price. If you get the part # from Ford... and it costs an arm and a leg... go to www.speedconcepts.net and send them an email saying yer "ka0tyk's" buddy from stangnet... the guy who owns the shop is in my mustang club. VERY nice guy.