Differential Swap Question
 

I've got a 79 5.0 Mustang that has a 7.5" Rear End and 2.47 gears down to 4 lug wheels. I wanna get like an 8.8 or 9" rear with a higher ratio and 5 lug wheels. What should I look for like around a junkyard or something? Are there kits on summit or anything? Any Help? Thanks

Just get an 8.8 from an 87 up 5.0 car, its a bolt in and weighs a good bit less than a 9 inch (not to mention being about 4% more efficient)

The 86 5.0 cars had the 8.8 as well. I beleive the automatic cars had an optional 3.27:1 gear. Check the tag on the rearend, if it's still there.