Anyone running 4.10 gears for heavy towing? - Chevy and GMC Duramax Diesel Forum
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post #1 of 59 (permalink) Old 02-22-2017, 06:23 AM Thread Starter
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Anyone running 4.10 gears for heavy towing?

I have an '07 LBZ crew cab 2wd dually that I tow a 48' race car trailer with living quarters with, usually weighing in the 29,500 range total. I was putting brakes on it this past weekend and saw that the pinion had a little movement in it. Pulled the rear end apart and one of the bolts that holds the spanner locks in had backed out, and the bolt and spanner lock got thrown up into the pinion bearings and the front pinion bearing ended up tearing up the pinion, and wore it down. So there's no interference fit at all. It'll flop around on there. So I need to buy a ring and pinion.


I run Michelin 235/85-16 LTX M/S2 tires which are a little bigger than stock at 31.7", stock being roughly 30.3". I travel all over the place doing 75mph plus or minus a little most of the time.


Can anyone speak from experience on switching to a 4.10 gear in a similar situation? A 4.10 would put me at ~1920rpm at 72mph, where as 3.73s and stock tires would have been ~1830. My fuel mileage ranges around high sevens to low and mid eights most of the time. Most of the routes I travel are hilly, and thinking the gears may help keep it in it's happy power range better. If I'm running 80, it'll definitely hold speed better on hills than it will at 70 with the RPM being higher. Seems to me like a 4.10 would be the right move.


I do run a PPE handheld on economy mode. EGR delete, Pro Fab Y bridge, down pipe, 5" straight exhaust, ARP head studs, etc.

2007 Silverado 3500 Classic - 470k miles - PPE Hot +2 E.T. programmer, Auto Meter boost and pyro gauges, Magnaflow 5" exhaust, Pro Fab EGR delete, Y bridge and down pipe, Detroit TrueTrac, 4.10 gears, Air Lift air bags, all Moog front end components, Energy Suspension control arm and leaf spring bushings
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post #2 of 59 (permalink) Old 02-22-2017, 08:14 AM
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4.10 for DDing more than towing
4.56 for towing more than dding

Ideally 4.30 would be great but finding 4.30 for the front is almost impossible

I run 4.56 with a 32" tire [email protected] In 6th
Also recommend a low stall TC. Take advantage of the extra gear multiplication without blowing through the TC in stop n go traffic and starting on hills..,
I run a transtar AX7L ~1700stall for last ~120k miles at ~400rwhp grossing upwards of 36,000lbs. I would also suggest jr kit a s main line pump pressure mod while trans is out.
A7XL was 250+100 core when I did mine last year.. I doubt it would hold max effort stock fuel dmax but that's not what I was after

Adam
99 C3500HD LBZ/4L85E hotshot.. Sold
97 C3500HD 454/4500 hotshot
99 FL60 8.3Lcummins/13spd hotshot
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post #3 of 59 (permalink) Old 02-22-2017, 08:20 AM
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Videos I did with mine right after I got the swap done...
I also adjusted the part throttle shift points to better suit the TC and power curve in the engine.
At the time of the videos I was only grossing 26k haven't changed anything since I started grossing 36k
https://youtu.be/XZDIWCpPq6Y
https://youtu.be/jWJV4J-2kaA
https://youtu.be/kgZ1u8NS_ig
https://youtu.be/ogR9BI2lwrg
DPC makes a billet single disc custom stall for ~6-700 range if you wanted to go that route

Adam
99 C3500HD LBZ/4L85E hotshot.. Sold
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post #4 of 59 (permalink) Old 02-22-2017, 12:27 PM
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Drive the truck in 5th and see if you like those rpms. Thats almost exactly were 4.30's would put you in 6th.

I have 4.44 and love them but I rarely run over 70mph.
At your weight and speed I think 4.10/4.30 would be great.


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post #5 of 59 (permalink) Old 02-23-2017, 05:10 AM
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I have a 2WD dually also and want to switch the rear gear out for 4.10s. Truck just seems to work to hard with the bigger loads. Empty it is great with the 3.73 gear. I also have larger than stock tires.

06 LBZ 3500, CCLB LT3, Dually, DRW club #266, Fuelab Velocity 100, EGR delete, PVC rerouted,Catalytic Converter Delete, EFI DSP 2, Trango JR & Mike L Shift Valve Springs with Allison deep pan, Hellwig airbags and airlift 72000 remote compressor, LineX, Rolling on American Force 19.5 wheels and 225-70-19.5 tires, The rest is stock.
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post #6 of 59 (permalink) Old 06-18-2018, 03:24 PM Thread Starter
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Wanted to bump this up and see if anyone else had any input. I am still running 3.73s for now

2007 Silverado 3500 Classic - 470k miles - PPE Hot +2 E.T. programmer, Auto Meter boost and pyro gauges, Magnaflow 5" exhaust, Pro Fab EGR delete, Y bridge and down pipe, Detroit TrueTrac, 4.10 gears, Air Lift air bags, all Moog front end components, Energy Suspension control arm and leaf spring bushings
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post #7 of 59 (permalink) Old 06-18-2018, 03:44 PM
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Seems like the Cab and Chassis trucks use the 4:10 gears-- as they are usually heavier and only driven on short trips. You should be fine with the 4:10, as you already changed the final gear ratio higher by adding larger tires. The Allison would like it also.

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.
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post #8 of 59 (permalink) Old 07-16-2018, 09:04 AM Thread Starter
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Bump. Still thinking it would be the right move but would like to hear from guys who run 4.10s and do a lot of highway driving.

2007 Silverado 3500 Classic - 470k miles - PPE Hot +2 E.T. programmer, Auto Meter boost and pyro gauges, Magnaflow 5" exhaust, Pro Fab EGR delete, Y bridge and down pipe, Detroit TrueTrac, 4.10 gears, Air Lift air bags, all Moog front end components, Energy Suspension control arm and leaf spring bushings
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post #9 of 59 (permalink) Old 02-19-2019, 05:52 PM Thread Starter
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Any new or additional opinions? The truck has 440k on it now, the rear end is getting significantly more whine. It's going to be time soon. I think 4.10 is the way to go.

2007 Silverado 3500 Classic - 470k miles - PPE Hot +2 E.T. programmer, Auto Meter boost and pyro gauges, Magnaflow 5" exhaust, Pro Fab EGR delete, Y bridge and down pipe, Detroit TrueTrac, 4.10 gears, Air Lift air bags, all Moog front end components, Energy Suspension control arm and leaf spring bushings
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post #10 of 59 (permalink) Old 02-19-2019, 06:05 PM
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I don’t know the best option for you, but how about a photo of the race car!!

2019 GMC Denali 3500 Crew Cab, single wheel, standard bed, Onyx black, black leather, Duramax Plus, Fast Idle, Grille Cover, Cab Marker Lights, Off-Road, Floor Liners, Mud Flaps, Gooseneck Prep.
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