I've got a 30 spline carrier from my front axle. I've forgotten if it will work as a rear carrier. A guy wants to buy it to replace his 28 spline carrier. the last owner of his axle, from what i can decipher, put 12b shafts in his 10b housing and carrier, somehow. he wants to know if the 12b shafts will fit in the 30 spl. carrier i have. a quote from him: "all i know is . i have 30 spline axles that measure 1.28" @ the splines . the guy that had it before me bored out the carrier so they would fit i guess. the spiders are correct or it wouldn't have worked. ireally think they are 10b 30splines but sure." let me know what you think.