WOT Junkie and avid corn burner
Join Date: Jul 2008
Location: Virginia Beach, VA
Slightly more acceleration. It all depends on what you intend to use this mn12 for. I decided to use 3.73's because I do quite a bit of highway driving and this is my daily driver. As it is, the engine is spinning at 2500 RPM to do roughly 70 mph, if I recall correctly. If you plan to use this car the same way I use mine, I recommend you go with the 3.73 TL pumpkin. Especially if you already have it, and it's ready to go.
Also, don't be surprised if you use a Mark 8 drive shaft, you still have vibrations. They are better than stock, but not by much. I plan to replace mine when I can afford to.
Michael M. ASE P2 Automobile Parts Specialist.
1996 Thunderbird LX. Gone, but not forgotten Oct 1995-March 24 2016 Trick Flow headded, E85 guzzling beast.
1985 Mustang GT. modified stock Holley 4180C, Weiand Street Warrior intake manifold, equal length headers, true dual exhaust, 5 speed, 3.55:1 8.8'' rear end, Ford Racing 10.5" clutch.
1998 Mustang GT premium. Trans Go shift kit, Bassani catted x-pipe, PI heads, cams, intake swap, Accufab elbow, SCT Xcal 4 tune, Eibach Pro-kit, Maximum Motorsports Caster/camber plates, fat tires. Banging audio system.