An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

[SnowBlaZR2]

Here
3.21 truck was heavier too yet still performed better


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https://www.motortrend.com/news/1812-pickup-truck-of-the-year-2019-masterpost-ptoty19/#:~:text=And%20when%20the%20dust%20settled,GMC%2C%20Ford%2C%20and%20Chevrolet.&text=How%20did%20we%20come%20to%20our%20decisions%3F

People are still peddling this?

 

[Mountain Whiskey]

The hp to weight thing is not 1 for 1. As it goes up the ratio goes down. The Ram has 100 hp less than a 4 door sedan with the same motor? Not likely.

 

[2021EcoDiesel]

Precisely, too many small differences between these two trucks. I’d love to see two identical trucks just for S’s and G’s.

 

[Mirowpl]

This thread started on January 15, 2020. Here we are over 4 yrs later still discussing 3.92 Vs 3.21 To me it’s very simple, if you tow a lot or what you tow is near the max for your truck can tow, then get the 3.92 gears. Otherwise the 3.21 work fine for the rest. This assumes only that you use the truck for real truck thing like hauling lumber or firewood or towing a boat/trailer. It does not take into consideration those who want to drag race at a stoplight or brag about all the goodies they added like the jeep people do. I drive a truck, it’s dirty all the time, and it is stock from the factory with 3.21 gears. I can tow my 21 ft boat,tow a 16 ft trailer and otherwise do what I need. I am happy

 

[Scram1500]

So a truck with an off road package is slower than regular truck with street tires? Interesting

 

[Rick3478]

This thread started on January 15, 2020. Here we are over 4 yrs later still discussing 3.92 Vs 3.21 To me it’s very simple, if you tow a lot or what you tow is near the max for your truck can tow, then get the 3.92 gears. Otherwise the 3.21 work fine for the rest. This assumes only that you use the truck for real truck thing like hauling lumber or firewood or towing a boat/trailer. It does not take into consideration those who want to drag race at a stoplight or brag about all the goodies they added like the jeep people do. I drive a truck, it’s dirty all the time, and it is stock from the factory with 3.21 gears. I can tow my 21 ft boat,tow a 16 ft trailer and otherwise do what I need. I am happy

Yeah, we digested all that in the first couple pages of the thread. We jus' playin' with it now.

 

[HSKR R/T]

Maybe, maybe not but what we do have is known HP/TQ, known weight and known gear ratios. The 3.92 truck should be both faster and quicker however its neither. The only time the 3.92 truck outperforms the heavier 3.21 truck is when loaded with 7500 Lbs. IMO, 3.92s are more gear than this truck needs and while they may "feel" better, they don't seem to actually perform better.

Until someone lines up two identical trucks sans the gears, this is what we have, everything else is just 3.92 jibber jabber

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As you continue to jibber jabber trying to rationalize why two different trucks had different outcomes, and we should use tht as an example of why gear ratio was the only difference that matters

 

[Mirowpl]

Oh so like let’s get to 3,000 posts?

 

[2021EcoDiesel]

Oh so like let’s get to 3,000 posts?

Heck yeah man. We're making headway.

 

[Bt10]

I've posted before, but as a reminder, we have both of the trucks listed in the drag race. My ORG has the Falkens, not the Duratracs. WITH STOCK TRANSMISSION TUNING, the 3.21 wins because it spends less time in reduced power torque management.

Counts Custom had a customer request the 5 speed auto, even with some late model hellcat motor, because he wanted to feel the torque longer between shifts. Too few of gears that allow the engine to drop out of it's powerband would also be counterproductive.

 

[BowDown]

People are still peddling this?

The hp to weight thing is not 1 for 1. As it goes up the ratio goes down. The Ram has 100 hp less than a 4 door sedan with the same motor? Not likely.

Precisely, too many small differences between these two trucks. I’d love to see two identical trucks just for S’s and G’s.

As you continue to jibber jabber trying to rationalize why two different trucks had different outcomes, and we should use tht as an example of why gear ratio was the only difference that matters

Me: Showing you that water is wet
You: Stomping your feet, no its not, not its not.

 

[theblet]

People are still peddling this?

Trying to hit 3000 posts!

 

[BowDown]

I've posted before, but as a reminder, we have both of the trucks listed in the drag race. My ORG has the Falkens, not the Duratracs. WITH STOCK TRANSMISSION TUNING, the 3.21 wins because it spends less time in reduced power torque management.

Counts Custom had a customer request the 5 speed auto, even with some late model hellcat motor, because he wanted to feel the torque longer between shifts. Too few of gears that allow the engine to drop out of it's powerband would also be counterproductive.

Even in the face of proof, deny deny deny

 

[HSKR R/T]

Me: Showing you that water is wet
You: Stomping your feet, no its not, not its not.

You feeling you know more than anyone else when it comes to bench racing is priceless.

 

[SnowBlaZR2]

Trying to hit 3000 posts!

I think that's the dude who tried to claim his Ram weighed the same as his Corvette or something.

 

[SnowBlaZR2]

Me: Showing you that water is wet
You: Stomping your feet, no its not, not its not.

You: Apple juice is wetter than orange juice when you aren't towing.
Me: *Points and laughs*

 

[BowDown]

You feeling you know more than anyone else when it comes to bench racing is priceless.

Ok Lol

 

[BowDown]

I think that's the dude who tried to claim his Ram weighed the same as his Corvette or something.

You: Apple juice is wetter than orange juice when you aren't towing.
Me: *Points and laughs*

Again, lol

 

[2021EcoDiesel]

Me: Showing you that water is wet
You: Stomping your feet, no its not, not its not.

Am I stomping my feet? Thought we were just having a discussion, but that's okay.

 

[SnowBlaZR2]

Again, lol

OK my dude.

Tell everyone about your loaded Limited that weighs 3200 lbs...