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ryanheacox · 09-21-2016, 07:25 PM

Seems high. 45mph is just shy of 2000rpm with everything stock and a 3.78 rear end. That would even be high with a 4.11 rear. I put the numbers in to a calculator and 2500rpm would be 58mph with 3.78's and 54 with 4.11's. Maybe the tach needs to be calibrated?

09-21-2016, 07:25 PM	#2
ryanheacox Senior Member Join Date: Apr 2013 Location: Northwest CT Posts: 1,092	Re: rpm vs. mph Seems high. 45mph is just shy of 2000rpm with everything stock and a 3.78 rear end. That would even be high with a 4.11 rear. I put the numbers in to a calculator and 2500rpm would be 58mph with 3.78's and 54 with 4.11's. Maybe the tach needs to be calibrated?