Hey guys, the tag on the rear differential is finally off, its from a 71 Bronco with an original 289. It reads as follows.
HFP-C 1AD
3L50 8 . 7 695A Thanks for any help, Rod

 

3.50:1 limited slip

 

Cyebo, I hate to rain on your parade, but the 289 last saw service in '68. Yours has to be a 302 stock unless it's been changed. Not meening to be picky, just want you to know what you have.
Eric

Proud owner of a '73 F-250 4x4 High Boy, 460 V8, NP435, NP205
And a '68 Bronco 289 v8 , NP435 , Dana 20