96-98 GTs have different power bands than the 99-01 GT's.
Don't even bother with 3.55's they are a waste of your time and money. 3.73's will be a waste as well because at the track you'll be shifting into 4th just before the traps and whatever you picked up in your 60ft time you'll lose at the top end. Go with 4.10's.
I had 4.10's in my car, yes it's daily driven 75 miles per day mostly on the freeway. The car has 56K miles on it and gets 19MPG and on long trips gets 27MPG. Now I have 4.30's and love them and as before it's driven to work every day. I go through the traps in 4th at 5800RPM, which is optimal for a 99-01 GT.
Bill
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00 GT, MAC Offroad H, Steeda Pulleys & Timing Adjuster, 4.10’s, Flows w/turndowns, UPR shifter, UPR Pro Series LCA’s, Lakewood 70/30’s & 50/50’s, 253.8 RWHP/292.8RWTQ
12.91@101.93 (1.74 60ft)
M/M 100, 7085
2001 Mod Motor Shootout 2V NA Champion
Recent Pic from Moroso