4l80e / 4l85e - What's The Difference?

[Twodogs]

I believe a 4L80E is basically a Turbo400 with an OD on it and electronically controlled. I'm sure there's a little more to it so anyone that knows please fill us in, but what's up with a 4L85E? I've seen the build codes to denote what's in the vehicle but haven't seen anything that tells just what the difference between the two are.

[CapitalTruck]

4L80 Specs:

440 lb-ft (597 Nm) (MT1) Maximum Engine Torque

885 lb-ft (1200 Nm) Maximum Transmission Torque (output)

 

4L85 Specs:

460 lb-ft (624 Nm) (MN8) Maximum Engine Torque

885 lb-ft (1200 Nm) Maximum Transmission Torque (output)

 

From GM Website:

 

OVERVIEW

 

The Hydra-Matic 4L80 and 4L85 are close-ratio four-speed automatic transmissions that serve the heavy duty truck market, full-size vans, as well as school buses and motor home chassis. The 4L85 was added as a heavier duty version of the 4L80 for the 2002 model year. The 4L85 has heavy duty components to handle increased torque and horsepower requirements. Those components include 5-pinion output and reaction gearsets. Within these gearset assemblies, the smallest gears are the pinions that revolve around the sun gears. Four-pinion gearsets are sufficient for most applications, but adding a pinion gear to the gearsets allows them to handle higher loads.