gsimpson9981
Active member
in process of changing drive shaft and half-shaft u-joints on my 81 automatic. removed joints and went to oreillys to purchase. they looked up the joints for my car...said all 6 were the same number. the half shafts were that number. but, the drive shaft is smaller. half shaft measures 1 1/16" cap and 3 5/8" cross shaft. drive shaft measures 1 1/16" cap and 3 1/4" cross shaft. Asked them to look up drive shaft joints for a 4-speed, and they are the right size. I thought oriellys parts look-up had bad data, but I've checked other parts suppliers, and they show the same thing. I may be wrong, but it looks like I have a 4 speed drive shaft in my car. Doesn't make sense...I have the build sheet...it shows MX3 Auto Trans. I does have Gymkhana suspension, not sure if that makes a difference. Any ideas?