Looking to possibly put a Dana in my Dart,few questions for those in the know.

crackedback said

First, I love your car Sanity!

If you are frugal in purchasing stuff, you can build a rear for under $1K. $1200 with a powerlock sure grip if you want to go that direction.

Rear $100
shorten $100
ends $80 Dr Diff
axles $300 Dr Diff
powerlock $150
gears $50-175
bearings $120 Dr Diff
set up $150

$1205 buy my count using the high side price on gears

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That is probably as cheap as you will get. I just did mine and spent nearly double that using my old brakes. The shortening cost $250, a second hand but new Detroit Locker was $450 (price out a new one!), Richmond gears were $265, 35 spline axles were around $500 and assembly labor was around $250. I think the entire bill was $1800 not including the housing and ends. Things are a bit more money up here though.