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The front end is usually not designed to take the full brunt of the hp available. Reverse pulling can weight the front more hence better traction. It will fail first in that situation. Best to avoid spinning and digging in. That said, many times I do reverse because I can it what is happening. Seems best way to pull cars out of snowbanks. Harder for them to hit me when pointed the other direction. lol
You referred to the strength of the transmission in reverse, not the gearing or the clutch. My ZF is geared almost as low in reverse, as first (as mentioned), and so is the SM420 in my GMC. Add low range to that, and the gearing isn't an issue. Neither is the clutch, if used properly.
High gearing and transmission strength are two seperate issues. Autos are geared high because of the torque multiplication in the convertor. I've had to use low range with an auto, where I wouldn't have to in a manual, to get the truck moving.
I did refer to the transmission in reverse and I would include the transmission gearing and clutch as parts of the transmission. I also said that often the reverse is geared higher than 1st not always. Your ZF is probably tough as nails but if you really tried to break it I would almost bet money on reverse giving before 1st gear.
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