3.9 + 4.11's

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Author Message   Adrian Strata (Adrians) New Member Username: Adrians Post Number: 8 Registered: 02-2003 Posted on Saturday, March 08, 2003 - 10:18 am:    Is anyone running this setup with 32" or 33" tires? What are the rpm's at when going 65mph, 70mph and 75mph? I do a lot of highway driving everyday (rt287, rt280, rt80). Anyone using 4.75's? Adrian 91RRC   A. Ali (Alia176) New Member Username: Alia176 Post Number: 10 Registered: 03-2003 Posted on Sunday, March 09, 2003 - 11:58 am:    Adrian, Here's the formula for calculating RPMs: RPM = (mph * gear ratio * 336)/ tire diameter gear ratio = T case in high * auto transmission in 4th gear * 4.11 Your owners manual will tell you the ratio for the T case and trans.   John Cinquegrana (Johnc) Senior Member Username: Johnc Post Number: 383 Registered: 07-2002 Posted on Monday, March 10, 2003 - 07:42 am:    That's great info Ali, but there is just one problem....Adrian can't multiply or divide!!! Yo Adrian!!!!!   Adrian Strata (Adrians) New Member Username: Adrians Post Number: 9 Registered: 02-2003 Posted on Monday, March 10, 2003 - 09:42 am:    Sure I can.......2+2=5, 3+7=9, 9-5=3....now who's the smart azz?   Adrian Strata (Adrians) New Member Username: Adrians Post Number: 10 Registered: 02-2003 Posted on Monday, March 10, 2003 - 09:43 am:    And thanks for the info Ali.