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Check measurements and mounting
The total length of the drive train shown in the picture is 100 inches. The next 2 pictures show close ups of the measurements. The model of the electric motor ends about 2 inches further forward than the drive shaft. That is what the next 2 pictures try to show.
Measure from the rear U joint to the frame where the bearing is mounted - 42 inches. This matches the first picture. There was no way to take a picture of the measurement in the truck
Measure from the frame where the bearing is mounted to the front U joint - 61 - 62 inches. It's a bit hard to stretch the tape that distance when you are flat on your back beneath the truck, so a range of 1 inch is as good as it's going to get right now.
That mostly matches with the first picture which shows 100 inches, not 103 or 104. 3 or 4 inches for errors in measurement is still not great, but it's better than 25 inches was!
The motor - could not find a plate with information on it. Perhaps that plate is still on the truck somewhere. It is a 6 cylinder - that's all I have.
The transmission has more info. It has a large K stamped on one end, 21 on the other end, Hydromatic type 2TLM4 with the number 8676359 about the middle between K and 21. The serial number shows as 2 separate numbers, 4193 and 98626. The spline is about 5 inches long and there are 3 bolts from the flywheel to the torque converter (I think that's a torque converter). The motor side has 6 holes, on the reluctor ring/flywheel. But the torque converter has only 3.
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