Quote:
Originally Posted by Kate1025
Assuming we have it as going down the Grapevine 6% grade for 5 miles (CA) had issues with engine torking way down as we descended. I understand it is supposed to help with braking but it may be a bigger issue when traveling at 45mph - engine went from 2800 rpm to 4000 rpm when it kicked in. Releasing the tow/haul switch at this point did NOTHING!
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Maximum engine rpm for the single overhead cam, Triton V-10 is 5,200 rpm. The engine's computer will not let the engine exceed that rpm. The normal operation rpm for the Triton used in the F-53 chassis with the 6R140 transmission is 800 to 4,500 rpm. The only engine ever used in the F-53 chassis (until 2020) has been the Triton, although it has been back with 4 different transmissions. The engines design life is 200,000 miles.
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