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The axle tag says it's an S613B, and that it's a 3.73 ratio with limited slip. I double checked it against the interwebs and the info matches. I would rather have a 4.10, but the 3.73 will work fine. With the factory RX-7 3.909 gear my 12A halfbridge would hit 9000rpm in first just about as fast as I could shift it and 80mph was 4000rpm. The tires I'll be running aren't much taller.
http://www.fordification.com/tech/rearends_ford13.htm
Would Escape rear-ends work, power-wise, brake-wise and track? I've seen LSD retro-kits for them. To be honest though, I've never looked under one...
Ken