The Cobra engine looks a lot different then the GT. If there's a running hourse emblem then its a GT, if a snake and signature plaque (96 and up) then its a Cobra. If it has a single throttle then its a GT, if its has a dual then its a Cobra. There are more differences, but those are the easiest to explain. If you would like to see a picture let me know, I'll post the URL.
As far as the meat of your question: 4.10s. 4.11s were the ratio available on the old 7.5 inch rear ends used on GTs in the '80s and 6 bangers till now. 4.10s are the 8 inch ratio. Not that it makes much difference (ratio wise at least), but lots of guys (friends and relatives) who are used to the old set-up tend to say that. As is the nature of DOHCs, the Cobra engines likes the higher RPMs then a SOHC or push-rod engine. A stock Cobra would be quite happy to rev to 7500 if it were allowed. The SOHC is happier in the mid-range. Basically 3.73s let the GTs get into their powerband nicely without running out of breath. 4.10s (or 4.30s) let the Cobras get into their power band quicker. I would deffently recomend 3.73s for a GT. This assumes street tires.
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'97 Cobra, K&N, Flowmaster, subframes, 4.10 gears, Steeda Tri-Ax shifter, Steeda G-Trac 3, Cobra R wheels w/ Goodyear F1s
[This message has been edited by 97snakedriver (edited 02-01-2000).]
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