Midnight89

I have a 89 ford f150 4x4 with 33x12.5x15 inch tires on 15x10 inch wheels. I'm trying to figure out which gearing I need for my speedometer to make the speedometer work right. I have stock gears in my diferentals.

ericantonio

This isn't the video I followed last year but it's pretty much same. I'm looking all around my computer for the notes on how you do the math portion but I can't seem to find it.

Chris_1

iTrader: (1)

You don't have the electronic dash in the video eric posted.
You have to do a bunch of math.
Somebody must have posted up a chart somewhere.
You will need to know the circumference of your tire and your rear end gear ratio.