Just installed my new Edge Evolution on my 02 FX4 Screw this past Monday and its performance programs compliments well with my CAI and Magnaflow SISO exhaust.

Yesterday though, It hung during a program change to correct my tire diameter during a "custom tune" and I had to call technical support at Edge Products to ask what to do. During the phone call I asked about the parameter Gear Ratio under the custom options section and why my display showed my truck havig a 3.31 gear ratio. He told me that that is Ford’s factory setting programmed into the PCM and not to change it unless I made a gear ratio change for my aftermarket tires. After explaining to him that my truck has the Fx4 option, which includes 3.55LS ratio and confirming the Certification Label attached by FORD shows it has the H9 or 3.55LS gear ratio. His answer.... "Oh, something ain't right"

It ain't the edge, I can tell you that! This explains why my speedometer was always off a little with the stock LT265/70R17 tires and almost perfect when I installed BFGoodrich 285/70R17's. Shame on Ford, for putting more mileage on my truck than it actually has but I guess I should have taken it to the dealer to have corrected first before putting on 60,000 miles.

Thanks to the Edge Evolution, I now have the correct ratio of 3.55 and tire circumference, 2515mm, programmed to correct the speedometer. During a test drive down the highway, I matched mile markers with the trip odometer and checked speed at 60 mph with stop watch. It is now Dead on! The planets have finally aligned and that comet that was heading towards Earth has veered off into space....

Now for the question, has anyone else had this problem with their speedometer? I would suggest checking it out if you have the Edge programmer or other type if you can because we wouldn't want Ford to be putting more mileage on our trucks so we would trade them in sooner now would we!

 

Similar setup here. The PCM shows that I have 3.73's when in fact I have 3.55's.

Denton

 

Mine is same, it shows 3.73 and I have 3.55. I assumed that it was that the Edge was preprogrammed for 3.73. What I understand you to be saying is that the edge is reading that out of the stock program. I always correct it when doing custom. I have checked mph with GPS. The truck odemeter is off 4 mph, the Edge odemeter is off 2 mph. Both faster than the GPS. That is after custom setting to 3.55 gears. I have never checked it running stock.

 

Just installed my Edge. Now the question is how to check what gears are in my truck. I have a 04 FX4 screw and have no clue. So can anyone tell me how to check this?

 

There is a code on your door tag, and there should be a tag attached to the third member housing. You can slide under and see what it says.

 

Ok off to check out the door tag

Thanks for the quick response! LOVE this site.

 

I bet your next question is "what do the codes mean".

19 = 3.55 open
H9 = 3.55 LSD
26 = 3.73 open
B6 = 3.73 LSD
27 = 3.31 open
18 = 3.08 open
25 = 4.10 open
B5 = 4.10 LSD

 

LOL beat me too it

B6 .... So I have 3.73 LSD in mine. Just have to compair off the Edge now and make sure it it correct.

Thanks again Bluejay432000!

 

When I do my custom settings and go to gear ratio it already has 3.73 which mine is a 3.73 LSD.

 

Your lucky then HIVoltage14.4, your PCM was programmed correctly from the factory. Mine wasn't as it showed me having the 3.31 gear ratio. Guess my truck was built early Monday morning.

 

I have B6 3.73 LSD. What does the LSD mean???

 

LSD = Limited Slip Differential

 

I currently have 82,000 on my truck and I noticed this speedometer error early on as I would pass quite a few radar stations along the side of the road and they always read about 3 mph slower than what my truck said I was actually going. I took my truck to the dealership and they told me my speedometer was correct as is and that all those radar stations must have been incorrect I knew it was a bunch of crap and this is probably why. I fixed it by putting on larger tires and now it reads correctly. Thanks Ford.

 

Actually, anyone in the aftermarket tuning industry should have known better than to say that - or there was a misunderstanding in the communication.

I'll tell you how it *really* works...........

The actual *truth* to this is that there are TWO areas in which this is controlled in the PCM in the 1999 & newer F-150 - one is the VID block, which is where Ford does it (this is the areas that is active and that controls your speedo calibration from the factory), and then the other is the area is inactive unless and until a tuners in the aftermarket, like us for example, recalibrates the speedometer - Ford themselves does NOT use this second areas I am talking about, but they do have to enter A value. So they put in a common value that reflects a gear ratio & tire size that was available on that vehicle - now it may or may not be the gear ratio for that *individual* vehicle, as there are numerous different gear ratios & tire sizes available, so they have to put something in there - this is extremely basic.

Now the area that tuners in the aftermarket recalibrate the speedometer in is NOT used AT ALL FOR ANYTHING UNLESS there is a specific SWITCH turned off in the PCM's programming - which only happens when using an aftermarket tuner or chip!!

Trying to say that Ford has an incorrect gear ratio programmed in and trying to blame it on that is pure bunk - anyone with a brain in the tuning industry knows that these vehicles have different gear ratios available from the factory, especially trucks like the F-150 - and *something* has to be put in there for a value, and that value is in fact good for ONE of the gear ratios available. If it didn't work like this, meaning if that area was active under any condition OTHER than when using an aftermarket tuner and altering it, then you would have gotten a constant code, a 1635 "Axle/Tire Out of Range" code from Day 1 of that vehicle's existence!

See, when a tuner *correctly* alters the tire size, you must ALSO put in the correct gear ratio, too (of if they want to alter the gear ratio, they must also enter the correct tire size info, too) - you cannot just put in the tire size alone, and *that* is what the problem was - not Ford putting in incorrect information - the info in the area that tuners can access is NOT USED by Ford - they use the VID block, so it doesn't matter what is in the other area unless you plug in an aftermarket tuner - and IF you do *that*, then you MUST plug in not only the correct tire size info, but you must also make sure to enter the actual gear ratio on the vehicle.

That was a cheap shot trying to blame Ford for this, IMHO - anyone who knows anything about vehicles in general knows that they are offered with numerous different gear ratios from the factory, and also knows that there are two different areas this info is stored in, and that only ONE of them can be used at a time - they can never both be used at the same time - this couldn't get more basic.

The fact that Ford gives us that second area is doing us a FAVOR so that we CAN alter this in the aftermarket, as the VID block can only be altered to gears & ties that Ford offered on that vehicle from the factory.

So in this second areas that Ford gives us where we can enter a much wider range of gear ratios & tire sizes that is NOT used until it is activated by an aftermarket tuner or chip has to have *something* entered there as a value - for example, in all 2004 & newer 5.4 3V F-150's 3.73 is entered for the gear ratio there regardless of it's actual ratio - once again, that area is NOT USED UNLESS you plug in an AFTERMARKET tuner - and anyone involved in this industry should immediately know that you have to enter both the correct tire size AND the correct gear ratio if you want to make a a change to EITHER the tire size or the gear ratio - this is extremely basic.

So either there was a very bad misunderstanding in that communication (and I do not believe that as that post was written), or whoever it was from Edge simply didn't know what they were talking about, as this is so basic on FoMoCo vehicles that virtually any tuner knows this (and certainly anyone working for a tuning manufacturer certainly should have known), trust me.

Mind you, this is not meant as an attack on Edge, rather an explanation as to how this actually works, and the fact that anyone in this industry should have known this - this is not something that most vehicle owners generally know, but anyone in this industry certianly should know.

 

Can't argue with that!

I wasn't bashing anyone from Edge or any other manufacture of Tuners, but it seemed odd that my friends 03 F150 with an Edge tuner had the correct ratio of 3.73 programmed into the VID block from the get go. I believe I was also talking to an inexperienced individual at Edge technical support while everyone else who was knowledgeable was out to lunch. It took him a while to give me answers to my questions as he was obviously looking at a computer screen for my answers. Believe me, I could tell.

All, in all, I'm happy with the results that the correct gear ratio and proper tire diameter are programmed in my Edge.

Glad you cleared things up by explaining the actual programming process Mike.