Plus 4 rear ends

[Phil Roettjer <Phil.Roettjer@quantum.com>]

I am in the process of rebuilding the 7HA/1 rear end on my 1967 plus 4 which
has a 4.1 ratio. I have inquired about  getting a 3.7 ratio ring and pinion
set and I hear they are not available. I understand that the rear end for
new plus 4s will fit in the older cars.  So I am contemplating just getting
a new one. Has anyone done this change? Is it a drop in or are some
modifications required? I heard it is 1 inch wider and that the hubs must be
machined .5 inch each to compensate. Has anyone done this change?

Thanks,
Phil Roettjer
Upton, Ma USA