gears question in gt aod

[xbajbusx]

95 gt with aod tranny looking to upgrade the gears not sure what do go with,can someone tell me rpm when doing 70 mph with 4.10 and 3.73 ?anyplace i can find a gear calculator to see what im looking at ,by the way i got 245/45/17 wheels on it ,

 

[Stanger007]

According to EEC Analyzer and assuming you have an AOD*E* tranny:

2.73:1 - 1667 RPM
3.73:1 - 2277 RPM
4.10:1 - 2503 RPM
4.30:1 - 2625 RPM

Using these gear ratios:
1st: 2.400
2nd: 1.460
3rd: 1.000
4th: 0.666