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Ford also derated the 3-valve V10 down to 320 HP at 4,000 RPM. Maximum torque is now 460 lb-ft at 3,000 RPM (just over 260 HP). There is speculation that the derating is probably on paper to limit RPMs to 4,000 RPMs due to noise standards it can't meet at highest RPMs.
I'm assuming that most motorhomes cruise at less than 3,000 RPMs in top gear which would suggest a downshift will still keep RPMs below 4,000 RPMs with new 6R140.
The V10 has a long stroke which is an advantage for low-end torque but not necessarily good for high RPMs.
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