how are the 833 overdrives???

I have one in my '72 Duster w/ 318 and a 3.23 7 1/4. The 3.23 is a little high for the OD at 60mph so I have plans to change them out with a 3.91 8 3/4 as soon as the 7 1/4 gave up which happened last week. It isn't all that bad gear spacing wise. It is really no different gear spacing wise than running a three speed but will an added gear for the freeway.


Chuck