Even worse than an aftermarket Ford 9" differential... Guys on here install aftermarket Dana 60 differentials in there cars with engines making very little power!

Mean while they complain that a 4L80E will be too big and consume too much power... Using a Dana 60 would be significantly worse!

Also, just so you guys know... My 4L80E transmissions consume less power than a stock 4L60E transmission on a chassis dynomometer.
So quit trying to use that as an excuse not to install one.
On that note, if you guys are soo worried about power consumption... I would look at a GM 12 bolt way before a Dana 60!