RPM's at 60mph, and/or 80mph With Automatic GT Gear Change

[svtcobra440]

Hey guys,
Like many, I'm considering changing the rear gears in my 2012 GT with an automatic.

Does anybody have the 60mph rpm, and the 80mph rpm for an automatic with 3.31 gears, and 3.55 gears? I'd like to compare the two ratios to my current stock 3.15. I looked all over the internet for the past weekend and didn't find the answer. Everybody is more about 1/4 mile times, and individual gear ratios. I just want my general question answered. Thanks in advance!

 

[Doug1227]

For what gear? Sixth?? IF so, here:

Trap Speed 2.73 3.15 3.31 3.55
40 914.6 1055.3 1108.9 1189.3
41 937.5 1081.7 1136.6 1219.0
42 960.3 1108.1 1164.3 1248.8
43 983.2 1134.4 1192.1 1278.5
44 1006.1 1160.8 1219.8 1308.2
45 1028.9 1187.2 1247.5 1338.0
46 1051.8 1213.6 1275.2 1367.7
47 1074.6 1240.0 1303.0 1397.4
48 1097.5 1266.4 1330.7 1427.2
49 1120.4 1292.7 1358.4 1456.9
50 1143.2 1319.1 1386.1 1486.6
51 1166.1 1345.5 1413.8 1516.4
52 1189.0 1371.9 1441.6 1546.1
53 1211.8 1398.3 1469.3 1575.8
54 1234.7 1424.7 1497.0 1605.6
55 1257.6 1451.0 1524.7 1635.3
56 1280.4 1477.4 1552.5 1665.0
57 1303.3 1503.8 1580.2 1694.8
58 1326.2 1530.2 1607.9 1724.5
59 1349.0 1556.6 1635.6 1754.2
60 1371.9 1582.9 1663.4 1784.0
61 1394.8 1609.3 1691.1 1813.7
62 1417.6 1635.7 1718.8 1843.4
63 1440.5 1662.1 1746.5 1873.2
64 1463.3 1688.5 1774.2 1902.9
65 1486.2 1714.9 1802.0 1932.6
66 1509.1 1741.2 1829.7 1962.4
67 1531.9 1767.6 1857.4 1992.1
68 1554.8 1794.0 1885.1 2021.8
69 1577.7 1820.4 1912.9 2051.6
70 1600.5 1846.8 1940.6 2081.3
71 1623.4 1873.2 1968.3 2111.0
72 1646.3 1899.5 1996.0 2140.7
73 1669.1 1925.9 2023.7 2170.5
74 1692.0 1952.3 2051.5 2200.2
75 1714.9 1978.7 2079.2 2229.9
76 1737.7 2005.1 2106.9 2259.7
77 1760.6 2031.5 2134.6 2289.4
78 1783.5 2057.8 2162.4 2319.1
79 1806.3 2084.2 2190.1 2348.9
80 1829.2 2110.6 2217.8 2378.6