Forum Discussion
HMS_Beagle
Oct 02, 2016Explorer
I had the GM 8.1L/Allison combination in a motorhome chassis once. That transmission was a breakthrough, and the motor had great power if you let it rev and didn't mind 6-7 mpg. But the Ford 6R140 transmission in my '15 F350 is quite a lot better still, and the power of the 8.1 simply cannot compare to the new diesels.
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