Lifted v-10
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Elder User
Joined: May 2004
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Lifted v-10
I lifted my 99 f-250 SD and put 35" tires on it. I keep hearing about the computers need to be reflashed for tire increase. What does this intel and would this be the same as getting a chip that changes the speedo set up for tire changes. If I need to get it done at the dealer what do I need to tell them?
Cargo Master
Joined: May 2002
Posts: 3,271
Likes: 229
From: Gulf Coast, FL
It is not a reflash or the same as a chip. All you are doing is changing the mathmatical formula that displays the speed. If you tell the service tech to enter a value of 601 you should be dead on with 35" tires.
I have had this done, it should cost you a half an hour in labor($35+) any more and go find a different dealer. There is a step-bystep procedure on a different site if you need to bring it in to them.
Tell them you need to have the speedo set for you tire size. Use the 601 value instead of the stock setting.
I have had this done, it should cost you a half an hour in labor($35+) any more and go find a different dealer. There is a step-bystep procedure on a different site if you need to bring it in to them.
Tell them you need to have the speedo set for you tire size. Use the 601 value instead of the stock setting.
Posting Guru
Joined: Mar 2002
Posts: 2,245
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From: Vancouver Wash USA
Originally Posted by HeavyAssault
Your speedo will be off when you drive without reseting the value.
Cargo Master
Joined: May 2002
Posts: 3,271
Likes: 229
From: Gulf Coast, FL
Only the dealer has access to change that setting. Your brakes will kinda feel like you can't come to a stop. I think it will change ABS controlling the porportion (sp?) valve.
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Posting Guru
Joined: Mar 2002
Posts: 2,245
Likes: 16
From: Vancouver Wash USA
Originally Posted by EPDP99
What will the ABS problem be, and if I buy a tuner will that be able to change it?
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Junior User
Joined: Mar 2000
Posts: 90
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From: MN
I know some of you may not agree with this, but I'm going to add my 2 cents worth here. I have had three Superduties since 1999. I have run 35" tires on all three of them and have yet to get my speedo reprogrammed. The Speedo is off by exactly 10% from the stock configuration, so it makes it easy to know how fast you are going. 55 mph onthe speedo is really 60mph now. I have had no adverse affects with ABS or anything else. In fact, I gain 10% more warranty by not reprogramming the speedo.
I guess the point I am trying to make is that if you need your speedo accurate, then reprogram it. Otherwise, you do not NEED to do it. The ABS, etc will be fine.
MJS
I guess the point I am trying to make is that if you need your speedo accurate, then reprogram it. Otherwise, you do not NEED to do it. The ABS, etc will be fine.
MJS