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Message: [QUOTE="me2, post: 321301, member: 3825"] Here is a table of Allison transmission ratings from their 2010 brochure. [ATTACH=full]85241[/ATTACH] As you can see, the maximum input shaft (turbine) torque rating of these transmissions is 950 ftbls. Versus the 1400 ftlbs for the 6R140. I'm sure that someone might chime in and tell me that the rating on the Allison used in the GM trucks is higher. And it probably is. But I can't help but feeling that the Allison has less strength reserve to deal with the torque my engine will make than the 6R140. I'm also sure that there are many successful drag racing and pulling trucks running Allisons. Trailer towing is entirely different than drag racing or truck pulling. When pulling trailers the transmission clutches must hold the torque for hours at a time without slipping. [/QUOTE]

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