rear end any good

[westcoastdodge]

hi guys,just on with my charger build,got lots of sheetmetal still to do but while i am waiting on parts thought i could do some work on the mechanicals.my charger came with the 8/34 case but no diff assy.have gotten a 489 differential assy with just 700 miles on a rebuild,(open diff) 323 gear would this work ok on my application i do know that i need to get the larger yoke as i think i have the smaller style.would a 68 rt come with this from factory??  

[Alaskan_TA]

The 489 case was first available for the 1969 model year.

Big to little conversion u-joints are available.

What is the centerline of the spring perches?

1968-70 B-body spring perches are 44" center to center.

[c00nhunterjoe]

So you have an open pumpkin and a bare case? Depending on what engine and power level i would STRONGLY suggest considering building a dana. The cost from scratch to build a dana vs a 8.75 is not much.