I recently bought a 4x2 5.7 RCSB Tundra with the sport package. I began to think about why Toyota put 4.10s in the rear end instead of the 4.30s with the sport package. I couldn't think of any reasons. In terms of production cost, I would think it would be cheaper to have just one ring and pinion(4.30) instead of two (4.30s) and (4.10s). In terms of performance, there really isn't that big of a difference between the two different ratios to either effect gas mileage or performance. Any ideas anyone. Also, before I bought my truck I was looking at the Titan, and in all their brochures, they seemed to make sure they made the point that their 5-speed transmission with a rear differential ratio of 2.94 was the equialvent of a 3.73 rear end with a four speed trans. What does our 4.10s equal out to and what does the 4.30s equal out to when compared to a four speed tranny? Thanks,
scott
4.3 is better for serious towing than 4.1 and therofore is put on trucks with tow package. since yours is sport, it does not have a tow package, therefore 4.1 is good enough or even better in your case.
I guess I am just curious if any performance is lost because of the higher gear ratio compared to the 4.30. Considering it is the sport package, they should have thrown some 4.56s in. LOL
I'm guessing the sport package probably gets better mpg? What rpm does the sport package turn at 65 mph? I was surprised to see mine with the towing package isn't sitting at 1,200 rpm on the freeway cruising at 65 mph. The rpms were much higher than I expected. I think they probably could have gotten better mpg out of this truck has 6th gear been running at 1,100-1,200 rpm. The engine definitely has the torque to pull this off.
[QUOTE=. Also, before I bought my truck I was looking at the Titan, and in all their brochures, they seemed to make sure they made the point that their 5-speed transmission with a rear differential ratio of 2.94 was the equialvent of a 3.73 rear end with a four speed trans. What does our 4.10s equal out to and what does the 4.30s equal out to when compared to a four speed tranny? Thanks,
scott[/QUOTE]
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The final ratios (diff ratio x OD ratios) are as follows: 4.30 diff: 5th 3.13, 6th 2.52. with 4.10 diff: 5th 2.98, 6th 2.41. Very little actual difference in what each would tach at highway speeds.
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The way that Nissan ratio is expressed above is not worded correctly; if 4th is 1:1 @ 3.73 then to achieve a 2.94 final would mean that 5th is 0.79 approx.
The 4.10 might end up being faster/quicker in some cases. Not sure if it's true, but it's about the only real reason I could think of. I doubt it would change mileage much. Are they rated the same?
I think the 4.30 was used so that the torque curve would be in the right place (RPM's) in regards to where the engine achieves maximum torque. Otherwise known as the "sweet spot".
I'm guessing the sport package probably gets better mpg? What rpm does the sport package turn at 65 mph? I was surprised to see mine with the towing package isn't sitting at 1,200 rpm on the freeway cruising at 65 mph. The rpms were much higher than I expected. I think they probably could have gotten better mpg out of this truck has 6th gear been running at 1,100-1,200 rpm. The engine definitely has the torque to pull this off.
Mine sits right at 1500rpms at 60mph, not sure where it's at at 65mph though.
I think the 4.30 was used so that the torque curve would be in the right place (RPM's) in regards to where the engine achieves maximum torque. Otherwise known as the "sweet spot".
HP and Torque relates to the engine performance, what happens later down the drive train is a totaly different story.
those "little" 0.1-0.15 differences in final ratio do make a difference, maybe not day and night, but still. if the car is a non tow (sport) then it makes a sense to put 4.10 instead of 4.3
I still think it is strange for toyota to make two individual ring and pinion ratios. I would imagine it would have been cheaper for toyota just to make all their axles with 4.30s. There has to be a reason why Toyota did the 4.10s, besides just gas mileage, because I don't believe there is any substantial difference between the 4.10s and the 4.30s. I would think if they were worried about gas mileage they would have thrown in some 3.73s.
yea mine is about 2000rpm at 70 checked the other day
Yeah this doesn't make sense to me, in the past the whole reason behind a 6th gear would be turning low rpm's on highway to get better mpg. 5th gear should be the towing gear on the highway I would think.
Also any news on a computer update for shift points? Mine seems like the transmission shifts and gears that it runs in are too tall at low speed putting too much of a load on the truck causing excessive fuel consumption at least that's what I figure. It's like you are at 30 mph and want to go faster the tranny doesn't shift it stays in the taller gear and you can feel the load on the engine which in turn is going to cause excess fuel consumption. Now the tranny will shift if you put your foot in it and maybe this is what I should do? Almost feels like being too easy on the pedal may actually cause worse mileage because it doesn't use the gears if you ease up in speed, instead it stays in the same gear.
HP and Torque relates to the engine performance, what happens later down the drive train is a totaly different story.
those "little" 0.1-0.15 differences in final ratio do make a difference, maybe not day and night, but still. if the car is a non tow (sport) then it makes a sense to put 4.10 instead of 4.3
A little different way of saying it ........ they use the 4.30 to get the sweet spot in the torque curve so that you can use the torque of the engine while towing. Most states limit towing speed to 55mph so the lower 4.30 gear set gets the sweet spot into a more usuable MPH range for a tow vehicle.
The trucks with the 4.10 gear set don't have the tow package etc and no need to cater to the towing speed limit.
why 4.10s
Linear Mode
