We've got the 5 speed and it does a very steady and deliberate job of braking going done steep inclines. After going through the Rockies to include Ten Sleep, Wyoming - I came to love the engine braking. Pulling a 4500 lb Explorer behind a 12 ton Challenger - I really came to depend on it.
Reading some of the forums (specifically the IRV F53 forum), the 6 speed for whatever reason doesn't seem to do as well.
On the flat and small hills, the 6 speed far outshines the 5 speed but gotta say - I needs the help stopping this 13 ton monster on 6 degree downhill.
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US Army Retired - Loving The Road Trip
Challenger 37TB
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