I had to talk the GY dealer down to $261 from $281. I would have bought from the Tire Rack, but they were out of stock, with no estimated delivery date. The dealer had them, and would have charged more formount/balance if I carried in tires from somewhere else.
They also had a $40 gift card/mail-in rebate that I hope to get some day.
The MT's don't work as nice as the stock BFG AT's on pavement. So if you're mostly concerned with handling, noise, and lack of low-speed knobby vibe's, then stick with AT's.

 

Your 37" mod's look nice. Definitely worth the shear work to keep the stock ride quality...
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What size spare are you using? I take it you only bought 4 tires at that price?

 

Stock spare. I know that if I have to use it the truck will be lopsided quite a bit, but it is a spare. temporary way to get to the perminant fix. The 37" tires were $ 310.00 each plus mount balance and all the non-sense that gets added on. I think that the mild lift was best for me to maintain a good stock ride quality. To me it rides as smooth as silk. I just towed a super heavy trailer from florida to tennessee with no problem. My overhead showed a whopping 9.6 MPG with out the correction to the computer for the 37" tires. If anyone knows what the actual MPG really is I would love to know.

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Your stock BFG tires were 634 revolutions per mile. New tires are 574RPM. thats 10.4% different. (note: your actual dia. is 36". The BFG M/T's are 1/2" taller &565RPM)
So, your odometer reading will be 10.4% less than actual, and your mileage should increase the same %.
9.6 reading x 1.104 = 10.6~mpg actual. Outstanding!
Best would be to calculate the average mpg from known gallons pumped between fillups,and correcting for the Odo error.
Your speedo is off the same %; 60mph reading x 1.104 = 66.24 actual.
I've read on other posts that if you get your computer PCM corrected, you need to also be sure they correct the ABS controller module as well, or the ABS and Cruise Control will not work. Supposedly, if the speedo and wheel speed(as sensed by the ABS system) don't agree by a certain percentage, then it will not function.
I don't know if that is true or not. Sounds plausible.

 

Thanks JRH,
the superchips 3815 says that you can program the truck for larger tires as well as performance or economy. I have always put in 87 octain since day 1. Now I don't know to what level of completion the programmer will set for the larger tires. I can only hope for the best. It says it can compensate for economy with the 87 octaine but for performance gains they reccomend 91 octaine. I am too big a cheapscate to spend so much more for gas and not get it back in miles per gallon. I have no complaints for the performance I get with the 87 octaine. I really want to try the E-85. I think it is 105 octaine. The problem is, that it is very corrosive to the fuel system. Our trucks were not built for the E-85. I did read some where that if you occasionally use it, or if you dillute it to a 50/50 mix with regular gas that it wont really cause any damage. What do you think of the E-85 and gains from it?

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Well, with the taller tires you chose, I personally would want to get back to the stock performance level for acceleration, etc,
or better. [sm=gears.gif]
That probably means going for max perf. settings for your programmer, and then you must run the higher octane rating they dyno/developed the tune for. If you don't want to pay for premium fuel, then you are stuck with the "economy" tune, but beware you still might need an 89 octane or higher to make it run ok for towing, hot weather, etc., with your taller tire.
I have no experience with E85, we use(d) some ethanol blends here in California. You can thank the C.A.R.B. idiots for the now banned MTBE that is polluting the nations groundwater in exchange for "cleaner" air.
The main benefits of alcohol are higher resistance to preignition than straight gas (true"octane" depends on how it's formulated), and"cleaner" burning. Althoughcleaner, you need to burn more of it for the same amount of energy, =>your mileage will go down! (producing even morepollution [sm=lame.gif])
Youseem toknow most of the bad things about alcohol, and I would avoid it in high concentrations. Is E-85 85% alcohol? No way would I run that, except in a lawn mower.

I readan article by a hi-perf. engine builder, who said,about octane, that "...you will never know a difference, unless you don't have enough". Which means octane rating itself does nothing for your engine, as long as you don't experience preigniton, you have enough.
The problem with computers in vehicles is it detects the knock & ping before you do and retards the spark, reducing or eliminating the ping. And performance. So it can be hard todetermine whether to run higher octane or not sometimes.