I may be able to offer you assistance with understanding the capabilities of the 1998 GT as well as choosing the correct gear.
We use a computer based automotive performance calculator that accurately reports the performance of a car based on user input.
I had the same question when swapping out the rear gear in my 1969 Charger R/T. I had a choice of 3.23, 3.55 or 3.91. The 3.23 offered the best 1/4 mile times and the 3.91 was 1 tenth slower in the 1/4 mile. The 3.55 was 6 hundredths on a second slower than the 3.23 and turned out to be easier to get.
For a street driven car the 3.55 gears were fine and I was willing to give up the 6 hundredths of a second quicker in the quarter.
We used our computer program PC HOTROD to help make these comparisons and were satisfied with this decision. The car ran great!
<a href="http://www.pchotrod.com" target="_blank">www.pchotrod.com</a>
Not all cars lend themselves to a 4.11 rear gear; other things come into play as well.
A 4.11 gear may feel faster (seat of the pants) but the end result relies on the total combination and may end up being slower and becoming a waste of money and time.
I ran the numbers on your Stang and the reports indicate the following:
Stock Trim with a 3.08 gear:
14.86 @ 93 mph & 0-60 mph in 6.3 seconds.
Top Speed 140.5 mph.
Stock Trim with a 2.73 gear:
14.86 @ 92.4 mph & 0-60 mph in 6.4 seconds.
Top Speed 142.8 mph.
Stock Trim with a 3.27 gear:
14.87 @ 93.1 mph & 0-60 mph in 6.3 seconds.
Top Speed 141.1 mph.
Stock Trim with a 4.11 gear:
15.01 @ 92.4 mph & 0-60 mph in 6.7 seconds.
Top Speed 143.3 mph.
The 3.27 & 2.73 were installed by Ford based upon if the car was an automatic or a manual and I don't know which belongs with which so I ran the number on both as a 5 speed unit.
As you can see the 4.11 does not help at all.
I didn't think that Ford offered a 3.08 gear as an option for the 1998 GT's (could be wrong thought). Are you certain that is what you have or do you know that it was swapped out to an aftermarket gear?
I can email you these report to you if you wish.
Visit our website to view the performance reports of other Hotrods.
[ May 17, 2002: Message edited by: PC Hotrod ]</p>
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