PSOM reprogram / big Tires
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Joined: Nov 2006
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PSOM reprogram / big Tires
I now got 33 12.50 mud tires on my 351 95' 4x4 with 4r70w trans. I did a little searching of forums trying to fidn the procedure of reprogramming my speedo for the bigger tires. I look on the articles page on this site and found a page on how to do it. I got kinda confused reading the article. what is the easiest way to make my speedo on with the new tires? Will this help my truck shift a little different?
Thanks.
Thanks.
Postmaster
Joined: Oct 2006
Posts: 4,816
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From: Davis & Newcastle, CA
Shifting will be pretty much the same, you might notice a SLIGHT difference in the speeds where the tranny decides to shift, but I think it will be negligible. The only difference is that your truck will now have an accurate reading from the VSS. Without the accurate reading your mileage is going to be incorrect and your speed as well. I also need to reprogram my computer; I put on 33s as well. I seem to remember there being a specific button combination that you pushed to put it into the programming mode, then you need to rotate the tires 3 full revolutions and measure the distance it took, divided by 3, to get an accurate circumference of your tires. That number then gets inputted into the computer. The specifics on how to do it and which buttons to push, I don't recall. Anybody?
-Chris
-Chris
Senior User
Joined: Sep 2006
Posts: 118
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From: Eastern PA
I wasn't aware of any procedure like this at the time. I to have 33's and i just went with the superlifts tru-speed calculator. The chart to set it up was kind of a pain in the butt to read so i used my gps to program the speed. When my speedometer read what the gps read, i left it alone. All has been well since.
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