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I had the same problem. I also have 38s... Until I sell the truck. What I did was got ahold of a brother in my area with AE and he calibrated it for me. If you have the extra funds I would recommend you buy it yourself. I promise you it will pay for itself
X2 on what john said. I am running 38's on an 8" superlift lift kit. I just bought AE a couple weeks ago & was able to dial in my Speedo exact. Nice thing is even the odometer is right on now.
the AE looks pretty cool...but honestly a little more involved than I thought it would be. Now counting it out but what are your thoughts on the superlift truespeed?
I'm not a spokesperson for a product - I'm an advocate for members here... like you. Many here have taken our lumps and we're just passing on what we've learned:
When I was younger and had a gasser, I had a dwell meter, a timing light, and a set of tools to work on the car/truck/boat. Timing lights and dwell meters are fossils... everything is computerized now. Instead of a mechanical centrifugal spark advance, I have a bunch of sensors and a program. One sensor acts up and the program unravels... but you won't know which one if it's "too involved".
AE is a scan tool - a very inexpensive one. There are scan gauges out there, but I don't know if any of them adjust the tire size and they can cost as much as (or more than) AE. The tire size is just one simple thing (the ABS module has the speed calculations, so chips and tunes have no effect). Your truck is 10 years old and likely has some serious miles on it. I say this because gassers are typically done by 250K miles, but these rigs just need some work at that point and keep on going... and going. The first time you have a no-start, poor fuel economy, white/gray smoke, low power, or whatever... you'll log on to this or another forum and ask "why is my truck doing xyz". The reply will be questions - the first of which will be "do you have a scan tool?". From there we guide you through what readings we're looking for and explain why... the problem can even be solved quickly while you're broke down on the side of the road (assuming your scan tool is with you) . The forum has rescued many members on the side of the road in a matter of minutes this way... I think our record is 7 minutes. If your truck were to stall on the highway today, what do you suppose the first hour will be like... as opposed to the 7-15 minutes with a scan tool?
I will also add to that that I took my truck to the ford dealership to have them recalibrate the speedo... Well I had my wife take it while I was at work. When I called they said they could do it. So after an hour of her sitting there waiting a guy came out and said that he can only calibrate up to 35". I also looked all over at different things to recalibrate the speedo and most of what I found cost about the same as AE.
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