Dana Trac Pac?

[ny69ssdave]

I have a 70 dana rear for e-body. Actually its 69 casted and all the gears and posi unit are dated 69, The center pin to center pin in the spring perches measures 46.
Its a 4.10 posi rear, My question is Is there a difference between standard dana 60's and trac pack's?
I know it came out of a 70 challenger 440 car

 

[Cranky]

IIRC, the 4.10 is called the Super Trac Pak. What differences are you talking about? The E body rears generally run about 2" wider than the 68-70 rears over all and the spring pads too....