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Changing tire size speed sensor problems??
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Junior User
Joined: Jul 2004
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From: NH
Changing tire size speed sensor problems??
I have a 2000 F-350 SD 4x4 with 3:73 axles. It has a tire size of 265-75-16 E- range tires. I wanted to switch to a more affordible tire size of 235-85-16 e-range , since the truck will be used for plowing in NE I don't mind them being taller and thinner. Will be changing all 4 with agresive snow tires. But the dealer says that by changing the tire size would throw off the computer speed sensors. So I see by other post people are always going to bigger tires, I would like to know if their has ever been a problem with that giving bad info to computers. And is there a way to reset the computer for the new tire size. I have 4 wheel ABS I don't want to do somthing that is unsafe would not be worth the money saved. Thanks for any help or suggestions
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Joined: Oct 2002
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From: Newport Beach
There is a Tru-speed module by Superlift that hooks in-line with the speed sensor wire on its way to the ABS that corrects the signal to different tires sizes. It can store two different sizes and be changed with the flick of a switch. I got mine at 4wheelparts, also offroadwarehouse. Easy one hour install. Changing gears makes no difference as the magnetic sensor picks up outside the ring gear. Tru-speed corrects tire size for ABS, shift points, speed, and odometer.
Last edited by Tlattin; Aug 23, 2004 at 08:34 PM.
Senior User
Joined: Oct 2002
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From: Newport Beach
You set it via an adjustment screw on the side for the two settings. It is infinately variable to tire sizes. If you switch to snow tires in the winter, the two settings are nice to avoid dealer trips for OBD changes.
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Junior User
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From: NH
WOW-- The tire guy suggested that size I didn't know they where the same diameter. The 265s in load range E cost about $180 each, the 235s in E cost about $100 . Thanks again for all the info
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Originally Posted by woody1003
WOW-- The tire guy suggested that size I didn't know they where the same diameter. The 265s in load range E cost about $180 each, the 235s in E cost about $100 . Thanks again for all the info
235*.85=199.75
1mm is close enough for Government work!
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Senior User
Joined: Jan 2004
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From: GR, Michigan
No matter which way you go with the tires you'd better think about taking your truck to a different dealer for service. The speedometer calibration setting in the computer can accomodate quite a large difference in tire heights. If I remember correctly from about 28 to 36 inches. They use the tire's circumference and then a calibration table to determine the proper setting. If you dealer was not aware of this setting nor how to set it he is not a dealer to use.
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I agree, this is a standard and easy function of the PCM programing and any dealer that does not know how, or charges more than $15-25 for this service, is to be shuned, avoided, ridiculed, chastized, and flogged unmercifully
Yes that is how I really feel!
Yes that is how I really feel!
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