01-18-2021, 12:54 PM
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#1
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Senior Member
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Join Date: Aug 2011
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Nitro Gear 4.56 ReGear - Why the different Gear Oil???
I have searched, and I have asked in another thread... I feel like this needs its own thread because I can't be the only one with this question...
Quote:
Toyota Differentials (OEM) run LT 75W-85 GL-5 Gear Oil
Nitro Gears recommends using 80W-140 Gear Oil.
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So, I am curious...
Why the difference?
What is the risk of running the lighter oil with the Nitro Gears?
If you have regeared, what oil brand and weight are you using???
Background information: I have 165,000 miles on my original 3.73 gears with heavy loads and tons of towing. I had zero metal flakes on the drain at 75,000 miles and 150,000 miles. Last month, I upgraded to a Nitro Gears 4.56 gear set. I did the initial break in then drained and refilled with 80W-140 with the expected fine metal shavings a decent looking oil. I refilled it with Castrol 80W-140 per my mechanic's advice. Since then have put 2,500 miles on the vehicle, and I'm about to change the oil again just to ensure everything is okay. I have noticed that my fuel economy is way down. Power is up, but but I can't break 13MPG unloaded cruising at 55 MPH (I was as high as 18MPG fully loaded - not towing).
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01-18-2021, 01:32 PM
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#2
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Senior Member
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Join Date: Oct 2013
Location: illinois
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Real Name: Ron
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Senior Member
Join Date: Oct 2013
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Quote:
Originally Posted by 007Tacoma
I have searched, and I have asked in another thread... I feel like this needs its own thread because I can't be the only one with this question...
So, I am curious...
Why the difference?
What is the risk of running the lighter oil with the Nitro Gears?
If you have regeared, what oil brand and weight are you using???
Background information: I have 165,000 miles on my original 3.73 gears with heavy loads and tons of towing. I had zero metal flakes on the drain at 75,000 miles and 150,000 miles. Last month, I upgraded to a Nitro Gears 4.56 gear set. I did the initial break in then drained and refilled with 80W-140 with the expected fine metal shavings a decent looking oil. I refilled it with Castrol 80W-140 per my mechanic's advice. Since then have put 2,500 miles on the vehicle, and I'm about to change the oil again just to ensure everything is okay. I have noticed that my fuel economy is way down. Power is up, but but I can't break 13MPG unloaded cruising at 55 MPH (I was as high as 18MPG fully loaded - not towing).
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They are speaking from their experience and also advising you that if you have a problem and don't follow their advice don't be surprised if warranty denied.
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01-18-2021, 08:37 PM
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#3
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Join Date: Dec 2020
Location: Nowhere Special
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Real Name: Special Ed
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4.56 put more power to the ground.
More power, more pressure etc...
A lighter oil won't protect as well, (but don't mention that to people who swear by 0W20, even though they are two different applications).
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01-18-2021, 10:01 PM
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#4
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Quote:
Originally Posted by rdruss
They are speaking from their experience and also advising you that if you have a problem and don't follow their advice don't be surprised if warranty denied.
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That doesn't explain the difference though...
My 3.73 gears looked great after years of heavy abuse with OEM gear oil (changed every 75K).
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01-18-2021, 10:05 PM
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#5
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Quote:
Originally Posted by Nobody Special
4.56 put more power to the ground.
More power, more pressure etc...
A lighter oil won't protect as well, (but don't mention that to people who swear by 0W20, even though they are two different applications).
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Technically, they are not putting more power to the ground. The ratio is different giving more turns of the pinion gear (input from the drivetrain) allowing the engine to spin at a higher rpm to exert the same amount of force. The pressure is actually lesser on the gears (all other things being equal), they are just having to turn faster.
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I'm 007Tacoma. ...well yeah... because we have a... 2007 Tacoma... no a 2008 Tacoma... no a 2003 4Runner er... 2015 4Runner Trail Edition
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01-18-2021, 10:23 PM
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#6
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Join Date: Mar 2010
Location: denver
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Quote:
Originally Posted by 007Tacoma
Technically, they are not putting more power to the ground. The ratio is different giving more turns of the pinion gear (input from the drivetrain) allowing the engine to spin at a higher rpm to exert the same amount of force. The pressure is actually lesser on the gears (all other things being equal), they are just having to turn faster.
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You'are dead on. The one negative of regearing. Higher rpms equal less gas milage. What size tires are you running?
Last edited by spartacus; 01-18-2021 at 10:25 PM.
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01-18-2021, 10:28 PM
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#7
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Quote:
Originally Posted by spartacus
You'are dead on. The one negative of regearing. Higher rpms equal less gas milage. What size tires are you running?
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We are running 255/75R17 Kumho MT71s in C-Load.
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I'm 007Tacoma. ...well yeah... because we have a... 2007 Tacoma... no a 2008 Tacoma... no a 2003 4Runner er... 2015 4Runner Trail Edition
Check us out at TrailOrSail.com or on our YouTube Channel TrailorSailYT
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01-18-2021, 10:33 PM
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#8
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Quote:
Originally Posted by 007Tacoma
We are running 255/75R17 Kumho MT71s in C-Load.
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You could go up a tire size and may experience some gain. As'far as why 85-140. ESGS recommends that too. There is a long explanation on their site.
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01-19-2021, 10:20 AM
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#9
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Real Name: Mark the Common Sense Wizard
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Quote:
Originally Posted by spartacus
You could go up a tire size and may experience some gain. As'far as why 85-140. ESGS recommends that too. There is a long explanation on their site.
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Thanks! I'll check it out!
__________________
I'm 007Tacoma. ...well yeah... because we have a... 2007 Tacoma... no a 2008 Tacoma... no a 2003 4Runner er... 2015 4Runner Trail Edition
Check us out at TrailOrSail.com or on our YouTube Channel TrailorSailYT
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01-19-2021, 10:21 AM
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#10
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Quote:
Originally Posted by spartacus
ESGS recommends that too.
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I'm guessing you meant ECGS.
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01-19-2021, 04:57 PM
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#11
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Quote:
Originally Posted by Nobody Special
...(but don't mention that to people who swear by 0W20, even though they are two different applications).
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So why bring that up here?
Evangelize your motor oil viscosity religion elsewhere please. It is, after all, a different application.
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