If you've got the stock axles, you have 28 splines.
As a general rule, it's not a good idea to post directly for
Mr 5.0, he's got a ton of stuff going on, and although I'm sure he'd love to answer everybody's question, he's asked in the recent past not to be directly addressed for answers to tech questions. Although, he's been a welcome sight more frequently, lately.
He's got enough time involved policing
Unit 5302 and Unit's nasty habit of raising the temp in the forums around the Mustangworks. Dang that Unit, what did he do now???