HELP!!

[PrjctLxEnvy]

have not the slightest Idea where to post this, but does anyone know what, A. Part number it is for a Tremec 3550 Front U Joint, or B, .. know what vehicle came from the factory with said Transmission, I am having a hell of a time finding a replacement U joint, since the obviously did not come stock in a 91 Ford Mustang Lx 5.0....

 

[angelforbill]

I know shyt about motors and transmissions. But I know Google. Does this help:
"The 3550 was a Ford truck transmission from back in the late '80's and early '90's. The TKO is based on the 3550 but that's where the similarities end."
Found that here: Tremec 3550 transmission? - Ford Mustang Forums

 

[Noterminator]

Denny's Driveshafts Tremec Transmission slip yokes for 28 and 31 spline manual TKO 500 TKO 600 3550 you'll need the 1350 series.