Is this right?
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Joined: Jul 2012
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Is this right?
Ok here goes. My truck: 1989 f150. 4x4. 4.9. 4 speed. 4.10 gears with lockers front and back. Engine has been hopped up a little. I have American racing wagon wheels with 31x10.5x15 all season tires. When I run down the road at 45 mph, I'm running 2000 rpm. Is my speedo messed up by my tires or is that about right? I still average 20-22 mpg unloaded.
i ain't rite
Joined: Mar 2005
Posts: 65,579
Likes: 5,611
From: Marlboro Mental Hospital.
speed sounds a little low. have you had the speedometer recalibrated after the tire install?
the easiest way to see if it is correct is to take a drive with a GPS unit and see if the speedometer matches the reading on the GPS.
the easiest way to see if it is correct is to take a drive with a GPS unit and see if the speedometer matches the reading on the GPS.
i ain't rite
Joined: Mar 2005
Posts: 65,579
Likes: 5,611
From: Marlboro Mental Hospital.
i know you can get the gear from ford, but the are kind of expensive. the last time i got one they were like $10 each.
if you can figure how far off the speedometer is, post it up here and we should be able to figure out what gear you will need.
i have 4 different gears here. if one will work for you, it is yours for postage cost.
if you can figure how far off the speedometer is, post it up here and we should be able to figure out what gear you will need.
i have 4 different gears here. if one will work for you, it is yours for postage cost.
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