With the 4.10 the vehicle will be traveling 25% faster than the speedometer is indicating. Either use a GPS or do a timed mile- - - -one minute per mile is 60 MPH, no matter what the speedo reads. There are conversion gearboxes available to correct speedometer errors.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!