pdlarson
Billings MT
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2006 Suburban 1500 AWD LTZ 6.0L 3.73 gears. If I want to swap the gear ratio to 4.10, do I need to do any programming for the trans to shift correctly, speedo to be accurate, or any other issues? If so, are there tuning products that will let me change the programmed ratio on my own AND do tuning?
Billings MT
2006 Suburban 1500 LTZ 6.0L 3.73 gears Curt hitch
2012 Springdale 210BHLWE 25'
Tekonsha Voyager
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Jarlaxle
New England
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Joined: 11/18/2006
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Yes, you will, and yes, there are.
Note: you will also need the FRONT gearing changed. Are you sure the 1500 front differential has a 4.10 ratio available?
John and Elizabeth (Liz), with 3 nutty cats
My beloved St. Bernard, Marm, lost him 1/2/12
Current rig:
1992 International Genesis school bus conversion
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4*phun*2
Canada
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Joined: 09/24/2008
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You will not gain much going to 4:10 gears.
Glenn & Karen
'08 Chevy LT 3500 HD 4x4 CC LB DRW (nice hips)
'06 F350 4X4 Lariat CC LB DRW (nice hips) retired
'09 Victory Lane 38SRV Toy Hauler
'02 HD Road King FLHRCI KRUZN
'04 F150 XLT Super Crew
Our Toys
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Hannibal
Gas Station
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Joined: 04/12/2002
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Speed is read off of the ring gear so it follows wheel speed and won't be affected by a gear ratio change. However, the PCM "might" be looking for a given road speed for a certain gear/rpm. I'm sure there are others who can answer that question. I too don't think it's enough of a gear change to make a difference. In fact you'll still need 2nd gear on the same hills you do now. With the 4.10, you'll simply be turning that much higher rpm when you do. I prefer the 3.73 for gas and diesel. Gas for direct and 2nd (3rd for real 5spds) and OD/direct for diesels. The 3.73 simply matches the power band of the engines better in "my" experience.
'10 F250 XLT CC SB 5.4L 5spdTS 3.73
ex '95 Cummins,'98 12v Cummins,'01.5 Cummins,'03 Cummins; '05 Hemi
'07 KZ Jag 28JFSS.
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acadianbob
St. Paul, MN
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Joined: 02/05/2008
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You won't gain much and the expense will be horrific! You would be better off to change your tow vehicle.
Bob & Wendy; Spanky & Piper the Fox Terriers
2012 Race Red FX4 Ecoboost, Max Tow, Luxury Pkg
Surveyor 235RKS
Reese Dual Cam
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whisperide
Golden Spike area
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Joined: 09/27/2011
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Hannibal wrote:Speed is read off of the ring gear so it follows wheel speed and won't be affected by a gear ratio change. However, the PCM "might" be looking for a given road speed for a certain gear/rpm. I'm sure there are others who can answer that question. I too don't think it's enough of a gear change to make a difference. In fact you'll still need 2nd gear on the same hills you do now. With the 4.10, you'll simply be turning that much higher rpm when you do. I prefer the 3.73 for gas and diesel. Gas for direct and 2nd (3rd for real 5spds) and OD/direct for diesels. The 3.73 simply matches the power band of the engines better in "my" experience.
'06 GM doesn't read off the ring gear, but at the front end of the rear driveshaft. It does require re-calibration. Mine has the 4L80E rather than the 4L65E or 4L70E, so different ratios inside, but even with my stock tires, my 4.10:1 gears really aren't best for a stock 6.0, though my custom camshaft helped some. I'm looking around for the right deal on 4.56:1 gearing, which I'll definitely do this summer. No stock 6.0 has the off-idle torque of the older 350, and while the 3.73:1 was okay for the 350, it's not even close for the 6.0L.
'06 GMC C2500HD RCLB gasser 4.10:1, 4L80E, custom camshaft
'84 Trans Am 6.2 diesel, 700R-4, custom Class-3 receiver
'69 F350 dually. GM 6.2 diesel, turbo, 700R-4, NP208 all pending.
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dodge guy
Bartlett IL
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It needs to be recalibrated.
And going from 3.73 to 4.10 is not worth the expense for the small change!
Wife Kim 
Son Brandon 11yrs
Daughter Marissa 10yrs
Dog Shadow 
07 Cherokee 32B
02 Excursion 4X4 V-10 4.30 gear 5Star tuner Y-pipe mod Hellwig sway bar
Reese HP dualcam Prodigy brake controller
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better than a good day at work!
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SoCalDesertRider
SanDiego, CA, USA
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I would go with 4.56. The high revving gas engine will benefit from the higher rpms at lower road speeds for towing.
05E350 6.0PSD
97F350DRW 7.3PSD 4x4 4.10 11' flatbed
98Ranger
69Bronco ATC250R CR500
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B&W TurnoverBall, Curt Magnum V
HD Springs Bilsteins,
285/75-16E BFG AT on 16x8 Stocktons
4.56's & LockRite rear
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gmcsmoke
Butler
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Joined: 07/13/2008
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For a 6.0L a 4.28 would be the best overall gearing. 4.56 would be a tow beast but kill you unloaded.
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whisperide
Golden Spike area
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gmcsmoke wrote:For a 6.0L a 4.28 would be the best overall gearing. 4.56 would be a tow beast but kill you unloaded.
How did you arrive at this mythical 4.28:1 gear? What tire size were you figuring? And more gear doesn't always hurt average MPG, even if most of your miles are highway and non-hauling.
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