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blue00gt · 08-15-2001, 05:43 PM

I wouldn't waste time with 3.55's on a 99GT. Go with 3.73's or 4.10's. They won't even affect your mileage much - maybe 1-2mpg.
If you plan on getting a power adder later you should probably stay with 3.73's so that you will still trap in 4th. Otherwise, I would say go 4.10.

08-15-2001, 05:43 PM	#2
blue00gt Mustang Addict Join Date: Jan 2001 Location: McKinney, TX Posts: 1,294	I wouldn't waste time with 3.55's on a 99GT. Go with 3.73's or 4.10's. They won't even affect your mileage much - maybe 1-2mpg. If you plan on getting a power adder later you should probably stay with 3.73's so that you will still trap in 4th. Otherwise, I would say go 4.10.