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Bone actually the two speed rear ends were common in older 1 1/2- 2 1/2 ton trucks like I used to drive while harvesting when I wasn't on a combine. Most big trucks used to use a main transmission and a Browning transmission which had three or four gears. I don't know for sure what is being used now but I do know that the big rigs use both automatics and manuals but I think the manuals are just a main 13/15 speed road ranger transmission. Somebody on here can correct me if I am wrong. Gear vender and another company used to make a two speed splitter for our somewhat older pickup trucks.
Tom Marty
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