If anyone says 3.73's for preformace again I must kill you!
4.10 + is the only way. Nothing else is worth it in my opinion. I wish I had 4.56's now since I'm building my engine now that will rev about 1600 rpm's higher, but too late, I still love the 4.10's! Its perfect for driving around... I wouldn't suggest it for a transmission w/o overdrive thats street driven, and yes... with 225/55/16 and pony wheels i'm at about 2600-2700 rpms.
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Joe Zemaitis, Grand Rapids Michigan
1991 Mustang GT. Mods to date: 4.10 rear end, new POSI, aluminum driveshaft, AOD w/ shift kit, 2 1/2 off road h-pipe, 2 1/2 flowmasters and 2 1/2 tail pipes. Electric fan, Removed air pump and egr tube. Hotchkins upper and lower control arms. New energy suspension rear busings. Hoosier Quick Time Pro 27x10.5x15 and bolt on subframes soon to be welded. Everything else is STOCK. Totally stock ENGINE. 14.29@96 with 130k miles.
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