U Joint Cap Size

74desertduster said
Going to do the U Joints on my 71 Swinger with a slant six, automatic trans.

Was looking up the joints and there are two listed. One has a 1.126" Cup and one has a 1.078" Cup.

Is there any way of knowing what size I need before I drop the shaft and check one? Any method to the madness?

Will the rear be the same as the front since I can measure it once I unbolt the strap?

Many thanks!

Brian

Well, if you REALLY want to know, go to Harbor Freight and buy a cheap caliper and measure them. That way, you'd not only know FOR SURE, but you' have a new caliper!!!

But there's a VERY GOOD chance that the U-Joint you need is a 7260.... I've never seen a /6 drivetrain with a 7290 (the larger of the two sizes.)

Good luck!