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I am building a mustang for mini class on a 1/4 mile track. I am thinking of running 15 inch tires because I can get asphalt take offs already grooved and ready for $30 a piece. Can anyone give me an Idea on rear gear ratio? I will be running a 2.14 trans.
If the tires are around 84" try a 4.11
try a 373 rear
214 1/4 mile track well if you want 9000 plus rpms 411s 373s drop you down i run 345s or 355s depending on rearend if you want 7000 to 7500 i wouldnt go over that area of rpm enless you got at over 268 duration on your cam all them rpms wont do nothin with out a cam to work them o and thats running 76 yo 78 inch 15s too