Question about various rear ends

The Large bolt pattern and small BP are, how your axles are drilled for the studs, where your wheels bolt to the axle. The pattern is 4 1/2 " -5 Lug (Large), or 4 "- 5 Lug (small). When buying wheels, you have a much larger selection with the 4 1/2 ".

The 8 3/4" rear has either the 4" or 4 1/2" axles.

It also has one, of 3 different pumpkins, or third members.

The 741, the 742, or the 489.

All three are good, but parts are scarce for the 741 and the other two are better for drag racing.

These identifying numbers are found on the out side of each pumpkin, and they are the last three numbers.

There are also two different sure grips, the cone and clutch. There are pros and cons about these.

Then there are the different yoke sizes and I think there are 3 different rear brake sizes, 1 3/4", 2 1/4", 2 1/2" . I don't know much about these , either.

Hopefully I got this right and it helps get you started.