Ok folks never seen this before took a driveshaft off a automatic tranny and where it hooks up to the axle that u-joint was bigger than a standard tranny why whats the difference tks

 

yeah, that sometimes happens. For whatever reason, you have a "conversion U-joint".

Perhaps you have a diriveshaft or tranny yoke from a different application like a station wagon or something.

 

"Larger" in what respect?
Bearing cap diameter or width across the U-Joint???

Many Fords use a "Big Cap" rear universal that is the same cross with 4 same size trunions, but two caps are 1-1/16" OD while two others are larger at 1-1/8" OD which means thicker cap material. They did it because the thicker caps can better resist ham fisted mechanics over tightening the two U-bolts that secure the caps in the yoke on the rear axle.

U-Joint series identificationI have a 1997 Gold Wing GL1500 that was converted to a trike with Lehman GTL kit and it uses a shortened Ford 7.5 integral carrier rear axle and the rear U-joint is a 1310BC U-joint .... I use a Moog 430 in it.



I forget whether my '77 F150 uses a BC joint or not?