Howdy all. Haven't been here for a while, no money to play with cars but now have a little. Want to change out the u-joints and can't figure out what I need. Called Summit they said measure across joints and see if it's 3-1/2" or 3-7/8". I tried but can't directly measure cause stuff is in the way. I think it's 3-7/8 but I'm really not sure. Anybody know for sure what the front and rear joints should be? 66 Fairlane GT, 390 FE, 3 on the floor, open 9" rear end.

TIA, Scott
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66 Fairlane GT
Daily Driver / Survivor