If you don't plan on going to the track that much then I would go with the 4.10s reason being is with the 4.30s you are going to be spinning alot more.I know I have had both 30s & 56s alot more tire spin no 1st gear it's all spin,but I plan on racing mine in NMRA.Think about this if your spinning your not moving, unless you have tires that can hook that gear.From the 4.30s to the 4.56s rpms went up about 150 to 200 now I am about 3000rpm at 70 in 5th.Tim
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1999 Mustang Cobra
Solid Axle w/ 4.56's
Magnaflow Cat-Back
Dr.Gas O/R X-Pipe
JBA 1-5/8ths Shorty Headers
Homemade Powerpipe
March Pulleys
JMS Chip
Steeda Tri-Ax Shifter
Best E.T. w/ parts listed & BFG 275/40/17 D/Rs (10-26-'02; not including JMS Chip)- 12.95 @106.82, 1.79 60FT.
Best MPH- 107.43
New Best MPH (4-26-03)- 109.45
316 RWHP/ 309 RWTQ
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