I did not know
We have a 2007 Chevy HD 2500 truck that we bought new. We pulled and lived in a fiver for three years. I had the tranny serviced every 25,000 miles while towing, and since, every 50,000 not towing. ...
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Any of the larger chassis RV's(like Safari, Monaco, Holiday Rambler, etc) with the 8.1L GM engine had the Allison 1000 transmission. The smaller chassis with the 8.1L engines had the GM transmissions.