I will give you what I have from GM service info, There is not a spec for RPM@Speed. Here is general info.
Transmission General Specifications
Transmission General Specifications (4T80-E) Name
Hydra-Matic 4T80-E
RPO Codes
MH1
Production Location
Willow Run, Ypsilanti, MI
Vehicle Platform, Engine/Transmission, Usage
E, G, K, Ksp
Transmission Drive
Transverse Mounted Front Wheel Drive
1st Gear Ratio
2.960:1
2nd Gear Ratio
1.626:1
3rd Gear Ratio
1.000:1
4th Gear Ratio
0.681:1
Reverse
2.130:1
Torque Converter Size, Diameter of Torque Converter Turbine
265 mm
Pressure Taps
Line Pressure
Transmission Fluid Type
DEXRON Â III
Transmission Fluid Capacity, Approximate
Bottom Pan Removal: N/A
Complete Overhaul: 12.0 L (12.6 qts)
Dry: 14.2 L (15.0 qts)
Transmission Type: 4
Four Forward Gears
Transmission Type: T
Transverse Mount
Transmission Type: 80
Product Series
Transmission Type: E
Electronic Controls
Chain Ratios, Designates Number of Teeth on the Drive/Driven Sprockets
39/39
Final Drive Ratios
3.11, 3.71
Position Quadrant
P, R, N, Overdrive, 3, 2, 1
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Sunday, April 11th, 2010 AT 8:24 PM