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Both shops here in Houston that I've used say that there is no difference between the 3.55/4.10 gears. One of the shops did a before/after dyno to prove it. Of course if you are talking about a 5 hp loss, that's only 1.6% of the motor's power.
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2003 Dark Shadow Gray Mach 1
5.3L Stroker - FR500 Intake - Boss330 Heads
4.56 Gears - Kooks LTs - SCT Tune - Bassani X/Catback
2004 Silver Metallic Cobra
2.3 Whipple - 60lb injectors -Twin FGT Pumps
8 gauge/BAP/FPDM - JLT - Bassani Catted X / Catback - SCT PRP - 4# Lower - 3.50/3.00 Uppers - 19/24 PSI
2017 White Shelby F150
2.9L Whipple
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