After watching this video a second time I think your math may be off. Correct me if I'm wrong. When dividing tire size by wheel torque you used 2.79 feet as the radius. But 2.79 feet is the diameter. Radius is half that or 1.395 feet. So all the results appear doubled. Your torque results of 1700, 1554, and 2072 are actually 850, 777, and 1036. Did I miss something?
I pinned your comment because you are correct, I did accidentally use diameter instead of radius. But I believe my mistake would actually have the opposite effect, you are dividing wheel torque by tire radius, not the other way around, so by dividing by a number that is half the amount, you would get a much larger number for force that the truck is able to accelerate with, and much higher G force numbers
I learned in the 90s from Stacey David of "Trucks" the math to figure out the best "all around" axle ratio for a given tire size as follows, "tire size x 0.12=axle ratio". So 34" tires would be 34x0.12=4.08. 4.10s would be a optimum for someone who wants towing/off roading occasionally and decent fuel mileage. You're probably a bit low, but those tires are also heavier than stock and need the torque to get around easier. Good choice. The stock 3.42s are all about GM meeting federal fuel mileage requirements and the fact that 90% is these trucks never leave the asphalt. Also, 55mph used to be the national speed limit. This was because the FHWA (federal highway authority) tested mpg vs speed after the oil crisis in the 70s. 55mph offers the best mpg for highway travel. This is because above 60 mph vehicles use more fuel pushing through the air in front of them than their aerodynamics benefit.
I have 4.56 gears in my 95 Tahoe 5.7L/350. With my 27 inch tall street tires, at 70 mph I'm running around 2800 rpm. With the 268 Comp cam, AFR heads and Pro Flo 4, it's a real blast to drive but I average about 9 mpg. Sure that really sucks but I also average about 1,000 smiles per gallon. So it evens out. Wish I could get like 15 mpg though, that would be alright with me.
I just put 4.56 gears in my ram 1500 with 33x12.50 tires and I went from getting 13.9 to 14.5 when I’m stomping on it and over 15 when not stomping on it. I’m happy with them.
Trying to decide if I should eventually upgrade to 4.56 gears. Right now, I've got a leveled 2015 silverado with 33s on stock 3.73 gears. No issues. Eventually, I want to get a 4.5 inch lift with 35s. I'm assuming I'll need to get the 4.56 gears. I primarily use my truck for driving on forest service roads when I go hunting and fishing. I also haul/tow things around the farm. I rarely even get on an interstate/freeway. Mainly just country roads and unimproved forest roads.
Great video. Do you recall the url for the trans breakdown numbers for each gear on the chevy pressroom website? 18 ZR2 here, but Diesel with 6 speed trans. Good info to have for future mods 🤓
Looks like it is listed on 2019 and 2020 models, but not 2018. I assume the info is the same. For anyone else interested google search. "hydra-matic 6l50" site:media.chevrolet.com
Looks like PDX traffic. Did you run in Sport or Eco mode for the mileage check? With 4.10/31's I'm seeing 15/16 in town summer, 13/14 winter (remote start) Easy 20+ hiway. Sport mode is fun mode.
Great video man. I'm selling my 2019 polarisranger then I'm buying a used zr2 . Looks like 30 to 32 k gets one. This was a very informative video. Did you do a trans tune to
My gears had some whine/howl while coasting and at highway speeds from in-proper installed (13mm backlash instead of 6-10mm) properly installed gears should not have that problem
Peter Garcia the humming is actually coming from the new gears, it’s really weird, some days it’s loud (like that day) and some days they don’t make any noise at all. But I had the tires before the new gears and the tires are actually very quiet on the freeway
@@peteg7446 the diff oil was changed at the end of the 500 mile break in period, no change in noise, I'd like to do something about it but for cost reasons i'm probably just going to accept it.
@@campbelloffroad3660 the reason is because they aren't OEM gears. chevy factory gear only go up to 4.10. i have 4.10 swapped in my truck and they are OEM quality, i have no noise at all no matter the speed. if you go out of factory ratios you only have aftermarket gears and they are noisy af.
GREAT for off road...Not so great for every day driving. The eternal compromise with street mods. Great for performance but affects drivability, fuel mileage, overall engine/drivetrain wear, etc. Been there ,done that, for many years. Finally grew up and STOPPED. A waste of so much money to make your ride worse on the street.
Respectfully disagree. A 2019 truck is entirely different than a Chevelle from decades ago. I now have 35 inch all-terrains on my truck and get 20 mpg on the freeway, a great ride quality and much better power and torque.
This reminds me of common core. (Makes no sense)to worry about gas milage if you want more torque. I can make it simple for you. More revolutions per minute of the engine, the more fuel you use. It’s not rocket science. Get a Prius.
Many people that are debating upgrading their gears want to know what all of the pros and cons are, and what the results will be. That is why I make these videos. Enjoy your Prius.
After watching this video a second time I think your math may be off. Correct me if I'm wrong.
When dividing tire size by wheel torque you used 2.79 feet as the radius. But 2.79 feet is the diameter. Radius is half that or 1.395 feet.
So all the results appear doubled. Your torque results of 1700, 1554, and 2072 are actually 850, 777, and 1036.
Did I miss something?
I pinned your comment because you are correct, I did accidentally use diameter instead of radius. But I believe my mistake would actually have the opposite effect, you are dividing wheel torque by tire radius, not the other way around, so by dividing by a number that is half the amount, you would get a much larger number for force that the truck is able to accelerate with, and much higher G force numbers
@@campbelloffroad3660 yeah. I realized that after I posted the comment.
I learned in the 90s from Stacey David of "Trucks" the math to figure out the best "all around" axle ratio for a given tire size as follows, "tire size x 0.12=axle ratio". So 34" tires would be 34x0.12=4.08. 4.10s would be a optimum for someone who wants towing/off roading occasionally and decent fuel mileage. You're probably a bit low, but those tires are also heavier than stock and need the torque to get around easier. Good choice.
The stock 3.42s are all about GM meeting federal fuel mileage requirements and the fact that 90% is these trucks never leave the asphalt.
Also, 55mph used to be the national speed limit. This was because the FHWA (federal highway authority) tested mpg vs speed after the oil crisis in the 70s. 55mph offers the best mpg for highway travel. This is because above 60 mph vehicles use more fuel pushing through the air in front of them than their aerodynamics benefit.
Great video. Nice explanation. I am definitely looking for fuel economy for my daily driver. Sweet numbers on your truck.
I have 4.56 gears in my 95 Tahoe 5.7L/350. With my 27 inch tall street tires, at 70 mph I'm running around 2800 rpm. With the 268 Comp cam, AFR heads and Pro Flo 4, it's a real blast to drive but I average about 9 mpg. Sure that really sucks but I also average about 1,000 smiles per gallon. So it evens out. Wish I could get like 15 mpg though, that would be alright with me.
My ranger hit 5.31 seconds 0-60. On 33x12.50r17 3 inch level Oz tuned. 3.73 gears
I just put 4.56 gears in my ram 1500 with 33x12.50 tires and I went from getting 13.9 to 14.5 when I’m stomping on it and over 15 when not stomping on it. I’m happy with them.
I’m considering 4.56 gears in my 16 Rebel. 3.92 gears now. Had 35s but it downshifted way to much. Back to 33s until I regear. Any regrets?
@@scraggsds no regrets for me, in fact I wish I would have got those on there long ago. More torque and more mpgs.
Engineering Explained is amazing. Your video is helpful too.
Trying to decide if I should eventually upgrade to 4.56 gears. Right now, I've got a leveled 2015 silverado with 33s on stock 3.73 gears. No issues. Eventually, I want to get a 4.5 inch lift with 35s. I'm assuming I'll need to get the 4.56 gears. I primarily use my truck for driving on forest service roads when I go hunting and fishing. I also haul/tow things around the farm. I rarely even get on an interstate/freeway. Mainly just country roads and unimproved forest roads.
i say 4.10 gears would be better
I thought you would be at 4G rpm with those gears at 70 wow that’s great
Did you get your speedometer recalibrated? If not the numbers on the trips are inaccurate.
How much did it cost you to install the 4.56 gears. Thinking about putting that gear ratio on my Tahoe with 35x12.50r20 tires
I paid about $1000 for parts and $1000 for labor
2200 rpms doesn't seem like that high. Isn't that where you want the rpms? My 2.8 zr2 runs about the same at 75-80mph and its stock
yeah with a 6 speed that sounds about right, a stock 3.6 would be at 1700 at 70 in 8th gear, but rarely has enough power to stay in 8th
Nice wide stance cowboy. Nice
Great video. Do you recall the url for the trans breakdown numbers for each gear on the chevy pressroom website? 18 ZR2 here, but Diesel with 6 speed trans. Good info to have for future mods 🤓
Looks like it is listed on 2019 and 2020 models, but not 2018. I assume the info is the same. For anyone else interested google search. "hydra-matic 6l50" site:media.chevrolet.com
@@jimh_vta Yes 2018 will be same Hydra-Matic 6L50 as 2019. media.chevrolet.com/media/us/en/chevrolet/vehicles/colorado/2019.tab1.html
Looks like PDX traffic. Did you run in Sport or Eco mode for the mileage check? With 4.10/31's I'm seeing 15/16 in town summer, 13/14 winter (remote start) Easy 20+ hiway. Sport mode is fun mode.
I was in eco mode for almost the entire trip! Thanks for being an active part of my channel!
How much did it cost to install the 4:56 gears?
I paid $1000 for labor
Hey, I’m putting 4.56 gears in my truck, with my original gears I was running 65 mph. What was your top speed?
Great video man. I'm selling my 2019 polarisranger then I'm buying a used zr2 . Looks like 30 to 32 k gets one. This was a very informative video. Did you do a trans tune to
The tune from Trifecta does engine and transmission!
Any updates on mileage with 456s? Are your gears still making noise? Do you think it is poor setup or will all 456 gears make noise?
Yes the gears still made noise all the way up until I sold the truck last month, I believe it was too to poor installation tolerances
I got 488 gears in my 69 chevelle with a 3500 stall.
Is that howl at highway speed from the gears? Do you get bit of a rumble too?
My gears had some whine/howl while coasting and at highway speeds from in-proper installed (13mm backlash instead of 6-10mm) properly installed gears should not have that problem
Did the tune also fix the speedo?
Yes it does
Any links to the tune?
so will 4.10 gears on my 2016 silverado lower my mpg?
Yes most likely unless you have 35” or taller tires
@@campbelloffroad3660 how bad will it lower it? thinking about getting some
@@nicktarius probably about 2 mpg
@@campbelloffroad3660 thanks for your help!
Great Video. How close to Plymouth are you?
Jason Duplantis about an hour and a half from my place, is that where you’re at?
@@campbelloffroad3660 No I'm in SC, but the company I work for is up there. Millennium Technologies, I go up a couple times a year
Jason Duplantis Nice!
What are you using to store your spare in the bed?
589 Fab spare tire mount!
@@campbelloffroad3660 thanks for the reply!
What tires are those, they hum pretty loud
Peter Garcia the humming is actually coming from the new gears, it’s really weird, some days it’s loud (like that day) and some days they don’t make any noise at all. But I had the tires before the new gears and the tires are actually very quiet on the freeway
Campbell ZR2 yes, I went back to the videos before the gears and no road noise. Weird how they're noisy, maybe try changing the diff oil.
@@peteg7446 the diff oil was changed at the end of the 500 mile break in period, no change in noise, I'd like to do something about it but for cost reasons i'm probably just going to accept it.
@@campbelloffroad3660 the reason is because they aren't OEM gears. chevy factory gear only go up to 4.10. i have 4.10 swapped in my truck and they are OEM quality, i have no noise at all no matter the speed. if you go out of factory ratios you only have aftermarket gears and they are noisy af.
Now go get the supercharger from Edelbrock!
GREAT for off road...Not so great for every day driving. The eternal compromise with street mods. Great for performance but affects drivability, fuel mileage, overall engine/drivetrain wear, etc. Been there ,done that, for many years. Finally grew up and STOPPED. A waste of so much money to make your ride worse on the street.
Respectfully disagree. A 2019 truck is entirely different than a Chevelle from decades ago. I now have 35 inch all-terrains on my truck and get 20 mpg on the freeway, a great ride quality and much better power and torque.
This reminds me of common core. (Makes no sense)to worry about gas milage if you want more torque. I can make it simple for you. More revolutions per minute of the engine, the more fuel you use. It’s not rocket science. Get a Prius.
Many people that are debating upgrading their gears want to know what all of the pros and cons are, and what the results will be. That is why I make these videos. Enjoy your Prius.