2600 is high for 3.73's. That's about what cruising is @ 70 for me with 4.30's. Its been so long since I looked but I'm sure it is between 2600-2800 rpm. Be advised 4.10's are not a very good dragstrip gear. You shift into fourth right before the finish line so the car is no where near the optimum rpm zone that it needs to be to 'pull' through the traps.
The pulley is a serpentine type with the ribs By the way, the car has the UPR powerpipe and K & N filter for a little extra breathing.
Good luck,
Jeff
P.S. - If you're really convinced that you must have 4.10's I have a FMS set that came out of my cobra with only 6,000 miles on them. They made no noise whatsoever - $100 plus shipping.
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96 Cobra
4.30's, Detroit Locker, Mosers, BBK 'h', ASP pullies, UPI Powerpipe CAI
12.91 @ 107
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