See how a new differential ratio changes RPM at speed and acceleration.
Your current diff ratio and the one you are considering.
Engine RPM at a known cruising speed with the current diff.
A numerically higher ratio raises RPM and acceleration but also revs and consumption.
A numerically higher ratio (e.g. 3.90 vs 3.45) multiplies torque to the wheels, so acceleration improves, but engine RPM at any given speed rises by the same percentage, raising cruising revs and fuel use.
Acceleration scales roughly with the ratio change. Going from 3.45 to 3.90 is about 13% more wheel torque, which gives a noticeable in-gear gain without touching engine power.
Only if the speed signal is taken before the diff; most are taken at the wheel, so the speedo stays correct, but the rev limiter is reached at a lower road speed in each gear.
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