What gears do i have?

[5Toes]

Crazy idea.. crawl under car and look at the diff's tag

[MattTHEe30GURU]

i just said its not really there its rusted to shit so i cant read it. theres a idea!

[bmwstudent]

jack up the car and spin the driveshaft until the rear wheels make one complete revolution. Count the number of times the driveshaft spins and you will have your ratio.

[Quadrajet]

What Jaxx said earlier is correct.

But if I remember correctly, I was reading a post here that there is an adjustment "screw" on the speedo for calibrating it. It involves using a machine for generating a pulse then using the "screw" to adjust the speedo reading.

I've verified my speedo is "off" but my odo is correct a couple different ways.

Also if you have an "open" diff. Jack up one side, mark the driveshaft and spin one wheel 2 revolutions and you'll get a very close idea of your ratio.

[Jaxx_]

jack up the car and spin the driveshaft until the rear wheels make one complete revolution. Count the number of times the driveshaft spins and you will have your ratio.

or you can do it 10 times and get it even more accurate. :)

[dirtrider372]

I have 3.73 gears and with my m20 I'm about at the same engine speed as yours at 65-70mph.

Im driving at like 65-70 mph and it revs at 3100-3200 rpm. What rear end gears do i have?