GM 6l45, 6l50, 6l80, 6l90 transmission info needed

[cxcad]

Hello,
I'm working on a project that requires a single reduction that is approximately 4:1, thus I'm looking into these transmissions for the parts. I'm trying to figure out how the first gear works so I can get the appropriate parts. Is only one planetary required for the reduction (I don't care about the direction of the output)? And if so what is the output: planetary, ring, or sun? Also can any give me some dimensions of the planetaries? I have been unable to find the dimensions.
Thanks

[newdude]

In Drive Range (D) 1st gear, torque from the engine is multiplied through the torque converter and transmission gearsets to the vehicle’s drive shaft. The planetary gears operate in reduction to achieve a 1st gear starting ratio of approximately 4.027:1.

 

• The manual shift shaft (508) and the manual valve (354) are

in the Drive position.

 

1 Power from Torque Converter

The turbine shaft with 4-5-6 clutch assembly (56) is driven by the converter turbine.

 

2 Input Internal Gear Driving

The input internal gear is located in the turbine shaft with 4-5-6 clutch assembly (56). The input internal gear drives the input carrier pinion gears which rotate around the stationary input sun gear (53), thus driving the input carrier assembly(52) in reduction. The input carrier is splined to the 1-2-3-4 and 3-5 reverse clutch assembly (51), which is rotating in the same direction as the turbine shaft but in reduction.

 

3 1-2-3-4 Clutch Applied

The 1-2-3-4 clutch is applied and holds the 1-2-3-4 clutch hub assembly (61), which is splined to the output carrier rear sun gear (489).

 

4 Output Carrier Rear Sun Gear Driving

The output carrier rear sun gear (489) is splined to the 1-2-3-4 clutch hub assembly (61) and rotates at the same speed and the same direction as the 1-2-3-4 and 3-5 reverse clutch assembly (51).

 

5 Output Carrier Rear Inner Pinion Gears Driving

The output carrier rear sun gear drives the inner pinion gears of the rear carrier assembly in the opposite direction of the sun gear.

 

6 Output Carrier Rear Outer Pinion Gears Driving

The rear inner planetary pinion gears drive the outer pinion gears in the opposite direction, which is the same direction as the 1-2-3-4 and 3-5 reverse clutch assembly. The outer pinion gears are in mesh with the output rear inner pinion gears and the output internal rear gear.

 

7 Low and Reverse Clutch Released

The low and reverse clutch releases before the 1-2 shift occurs which will allow the low clutch sprag outer race to rotate freely.

 

8 Low Clutch Sprag Assembly Holding

The power transferred to the output carrier assembly (68) by the output rear outer pinion gears attempts to rotate the carrier, but the carrier is held stationary by the low clutch sprag assembly (467). When the throttle is released, however, the low clutch sprag will overrun which allows the vehicle to coast, at least briefly until the TCM determines engine braking is required. At that time, the low and reverse clutch will apply and hold the low clutch sprag outer race.

 

9 Output Carrier Internal Rear Gear Driven

With the output carrier assembly (68) held, the output carrier outer pinion gears drive the internal rear gear (497) to achieve the 1st gear starting ratio of approximately 4.027:1