Barkle Thull, maybe that is why so many Torqshift transmissions that bite the dust - because maybe there are more of them out there.
I have yet to hear of a story first hand of an Allison behind a Duramax that has failed. I know of several Ford owners who have had a torqshift die, one just this last weekend. It was a guy who has had this new Ford for several months after owning a Duramax allison. He was indeed kicking himself in the Heinny for dumping his GMC. He was parking a fifth wheel right near my house when the tranny just died right there, blocking my driveway with the fifth wheel.
I am not a brand loyalist, but I generally like Fords better. But for towing heavy loads they don't seem to hold up.
I was not aware that the Torqshift was made by Allison, but if it is, it still does not mean anything in itself.
The Allison 1000 was made for medium duty trucks, up to 26,000 VCW, and then was brought in to meet up with the Duramax 6.6 for light duty trucks.
I don't think the Torqueshift is used for medium duty, but I could be wrong on that. I do know the Allison 2400 is used for medium duty Ford trucks.
My truck is still considered light duty, but has a GVWR of 11,400 + tow rating of 16,000 = 27,400 which is overthe limit of what the Allison 1000 is designed for.
But the real killer for transmissions is the torque of the engine, not the weight of the vehicle. Can't seem to find a torque rating for any of the Torqshift trannies, I don't know if it is published or not. I know the Allison had a published rating at 550 ft lbs, but I think they bumped that up considerably.