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Old 02-04-2009, 01:55 PM   #15
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Quote:
Originally Posted by Silvertwinkie View Post
Oddly enough, I did some very unscientific testing and found that a burb with 4.10s compared to a burb with 3.73s had no noticable fuel economy hit that I could see. Now I will fully agree that 4x4 (when activated) vs standard 2x4 is a significant difference in MPG.
I know of what you speak!!! All the work I did on my 95 Burb to help with towing, 3:73 454, still don't match what the 8.1 gets w/4:10's, stock.
Right now, Buffalo Winter, a lot of AWD driving, still getting 13.8 (DIC), city/highway. POI, when I checked the PCM the tire height was set at 28", actual is 31", Speedo/tach now right on the button.
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Old 02-04-2009, 02:04 PM   #16
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i agree.. problem is that 4.10 kit and labor is $$$... not a DIY job... my heavy-chevy dealer wouldn't give me a definitive answer on whether it invalidated my warranty, either...
Changing your gear ratio changes the fuel calibration and that pisses off the EPA big time. Hence the reason it voids your warrenty. adios, John
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Old 02-04-2009, 02:36 PM   #17
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Quote:
Originally Posted by Silvertwinkie View Post
Oddly enough, I did some very unscientific testing and found that a burb with 4.10s compared to a burb with 3.73s had no noticable fuel economy hit that I could see. Now I will fully agree that 4x4 (when activated) vs standard 2x4 is a significant difference in MPG.
One of our Suby's had 3:73 the other 4:10. Both had 5.3l.No measurable difference in performance or mpg. Both had "HD tow pkg". Both great trucks.

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Old 02-04-2009, 04:21 PM   #18
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Originally Posted by Diesel1 View Post
Changing your gear ratio changes the fuel calibration and that pisses off the EPA big time. Hence the reason it voids your warrenty. adios, John
That's why you do it after the warranty is over.

I had my PCM re-calibrated after the gears went in...of course I just didn't stop with the gear ratio...fuel/air ratios, torque converter locking, cooling fan activations, etc.

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Old 02-04-2009, 04:52 PM   #19
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Here's my all time favorite Diesel Burb "dreaming" site..
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Old 02-04-2009, 08:27 PM   #20
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Hello

The 2009 Suburbans work with the taller axles because they all have 6 speed transmissions now. With the 6 speeds the ratios are much closer so you always have the correct ratio for the job at hand. It is amazing the difference a couple of extra ratios make I think if you try one you will find that it easily out pulls the earlier models with 4.10:1 axle ratio and gets better mileage.

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Old 02-04-2009, 08:36 PM   #21
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Here's my all time favorite Diesel Burb "dreaming" site..
Home
I've been trying to forget this site since finding it about a year ago....tempting...if I had 70-80k on my clock I think I'd bite, but I only have a bit more than 18k on the odo......
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Old 02-04-2009, 10:54 PM   #22
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Interesting when you talk about converting to the 4.10 axle from 3.73. At build time for my '03 3/4 GMC van, the 3.73 axle was the standard axle when you ordered the 6 liter engine. Cost at build time to upgrade to the 4.10 axle was $25. A small price to pay to pick up almost 2,000 lbs of additional towing capacity.

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Old 02-05-2009, 12:57 AM   #23
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Hi, I was going to change my 3:73 gears for 4:10s but Ford won't let the computor calibrate my speedometer to match.


Quote:
Originally Posted by 53flyingcloud View Post
Quite simply, you can still order an "After Market" 4.10 gear package. Just be sure you order both kits , for the front and rear, if you are 4x4..

Hi, I got about the same numbers that you did, but the difference is in the torque rating how-ever small. 1/2 ton 6.0L 366HP / 376 Troque. 3/4 ton 6.0L 352HP / 382 torque.


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What was odd and maybe just an error, the 3/4 ton's 6.0L off the website has a 351hp 6.0L engine, while the optional engine in the 1/2 ton 6.0L is a 366hp??
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Old 02-05-2009, 06:13 AM   #24
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