Gear question

TD-5 · Feb 22, 2015

There really isn't a lot of difference between 4.10 & 4.30. Only 90 rpm. If your tires are a true 37" tall then @ 70 mph the engine will turn 1850 rpm with 4.10s & 1940 rpm with 4.30s. either is quite acceptable. But if you plan on driving at 80-85 mph for 4+ hours every day on the interstate then go with the 4.10's which will still put you in the higher rpm range for highway cruising( actually your 3.73s would be better for that senario) If you think you might ever drop a tire size to 35", go with 4.10's. On the other hand if you think you might jump up to 38", go with 4.30's. If you want the truck to snap off the line & jump up quickly into the power band, go with the 4.30's, you may just have to slow down a bit on the highway depending on how badly you need to conserve fuel.
There is a little trade off at one end or the other depending on what you go with. The other thing that may factor in is pricing, sometimes R&P in one ratio will be more than another.

jban126_f350 · Feb 22, 2015

TD-5 said:
There really isn't a lot of difference between 4.10 & 4.30. Only 90 rpm. If your tires are a true 37" tall then @ 70 mph the engine will turn 1850 rpm with 4.10s & 1940 rpm with 4.30s. either is quite acceptable. But if you plan on driving at 80-85 mph for 4+ hours every day on the interstate then go with the 4.10's which will still put you in the higher rpm range for highway cruising( actually your 3.73s would be better for that senario) If you think you might ever drop a tire size to 35", go with 4.10's. On the other hand if you think you might jump up to 38", go with 4.30's. If you want the truck to snap off the line & jump up quickly into the power band, go with the 4.30's, you may just have to slow down a bit on the highway depending on how badly you need to conserve fuel.
There is a little trade off at one end or the other depending on what you go with. The other thing that may factor in is pricing, sometimes R&P in one ratio will be more than another.

Think I will still have turbo lag with 4.10? Don't want to kill my truck on the highway.

old man dave · Feb 23, 2015

Assuming the stock tire is 33" in diameter.

37"/33"x3.73=4.18 equivalent gear ratio with 37" tires to stock tire/gear ratio.

4.30/4.10=1.04878 or 4.88% difference in ratio between 4.10 and 4.30.

So, if you want a little more power (or you like to play) go with the 4.30's/37"
At 3850rpm should be close to 128mph if you have the horsepower.

A little more cruising oriented on the freeway, go with the 4.10s/37".
At 3850 rpm should be close to 134mph if you have the horsepower.

If you like drag racing then its a different ballgame. You have to gear for your trap speeds.

jban126_f350 · Feb 23, 2015

old man dave said:
Assuming the stock tire is 33" in diameter.

37"/33"x3.73=4.18 equivalent gear ratio with 37" tires to stock tire/gear ratio.

4.30/4.10=1.04878 or 4.88% difference in ratio between 4.10 and 4.30.

So, if you want a little more power (or you like to play) go with the 4.30's/37"
At 3850rpm should be close to 128mph if you have the horsepower.

A little more cruising oriented on the freeway, go with the 4.10s/37".
At 3850 rpm should be close to 134mph if you have the horsepower.

If you like drag racing then its a different ballgame. You have to gear for your trap speeds.

What's better for daily driver. I like to play but I do highways driving sometimes to.

BBottoms · Feb 23, 2015

4.30s

cbf9703 · Feb 23, 2015

jban126_f350 said:
What's better for daily driver. I like to play but I do highways driving sometimes to.

You've already gotten both answers and lots of advice, although it seems like you don't really want to listen to some of it. ^^ that guy is 4.30 camp, I'm 4.10. Just pick one already :shrug:

jban126_f350 · Feb 23, 2015

cbf9703 said:
You've already gotten both answers and lots of advice, although it seems like you don't really want to listen to some of it. ^^ that guy is 4.30 camp, I'm 4.10. Just pick one already :shrug:

I know I'm listening I just don't want to make the wrong choice just want to find out what is best.

jban126_f350 · Feb 23, 2015

BBottoms said:
4.30s

Do you run 4.30 with your 37's?

cbf9703 · Feb 23, 2015

I run 3.73s with 35-37s (most of the '37's I run actually measure a little shorter). Fine with a little more power. On the stockish truck with an auto I'd like to go 4.10s, but not a priority right now. Besides, it's also an excuse to just throw more power at it.

scparrish · Feb 23, 2015

4.30s because math says so

jban126_f350 · Feb 23, 2015

cbf9703 said:
I run 3.73s with 35-37s (most of the '37's I run actually measure a little shorter). Fine with a little more power. On the stockish truck with an auto I'd like to go 4.10s, but not a priority right now. Besides, it's also an excuse to just throw more power at it.

I have toyo open country's and I'm making power and I don't want to sacrifice it with the 37's I want it to be geared closest to stock as I can with 37's I will probably go 4.30

But say I was racing someone on the interstate would the 4.30 hold me back?
I want to get the best of both worlds here.

Sorry I'm being so complicated I just want to be happy with my decision

SDS97_7.3 · Feb 24, 2015

scparrish said:
4.30s because math says so

The math only works if they measure out to a true 37"s.

jban126_f350 · Feb 24, 2015

SDS97_7.3 said:
The math only works if they measure out to a true 37"s.

I'll have measure them I'm not 100% sure

scparrish · Feb 24, 2015

Most all terrains run smaller, most mud terrains run right at 37, and the toyo mt runs slightly larger. Your talking about less than a hundred rpms in difference between all 37s.

For example the bfg all terrains are 36.3", they will put you around 1980 rpms cruising at 70. The toyo runs roughly around 37.1" and will put you at 1935 rpms running 70 mph.

cbf9703 · Feb 24, 2015

Here's my take with the math:

Toyo Open Country M/Ts run right at 37:
37"/33"x3.73=4.18 equivalent gear ratio with 37" tires to get stock tire/gear ratio. (still pretty close to a 4.10 ratio)

I'm currently running a 37 that measures 36.7:
36.7"/33"x3.73=4.14 (a lot closer to a 4.10 than a 4.30)

Just for chits and giggles (as brought up earlier) a 36.3 BFG All Terrain:
36.3/33x3.73= 4.103 (hmmm... 4.10s anyone?)

Plan ahead for the variance in tires you might run, not just the set you have on there right now. What happens when the tires start to wear? Your Toyos probably started with a tread depth of 21/32nd... when you lose let's say 6/32nds of tread depth (and the tire is in effect now smaller than a 37), the 4.10s will still treat you better than the 4.30s.

Now the day to day... I drive a mix of back roads and interstate, but I hate having the truck screaming at interstate speeds. 70 on the interstate is fine in theory when talking rpms, but what's your driving style? I'm in a state where 70 is the posted limit, honestly I'm usually 5-10 over that, probably more sometimes since my speedo is so off. I still think the 4.10s are the best bet all around if you're sticking with 35-37" range and have a heavy foot.

I've got trucks from 3.73s on 35s to 5.13s with 44s (rarely sees a paved road) and a 450 on stock tires with 5.38s that never sees the interstate so I don't have to shoot myself.

BTW, if you're that concerned about drag racing, 37s and mud terrains are not your friend. Sure, it's fun to blow someone's doors off on occasion, but let's be realistic it's not going to be a dedicated track queen... that's not what this set up is known for. Most mud terrains have chitty speed ratings anyway. Your Open Country's are probably Q (rated up to 99 mph). Just sayin...

psduser1 · Feb 24, 2015

Still?

If 4.10/4.30 gear is your debate, your not on the right track. If it's that big of a deal, turn the power up
:doh:

SDS97_7.3 · Feb 24, 2015

cbf9703 said:
Here's my take with the math:

Toyo Open Country M/Ts run right at 37:
37"/33"x3.73=4.18 equivalent gear ratio with 37" tires to get stock tire/gear ratio. (still pretty close to a 4.10 ratio)

I'm currently running a 37 that measures 36.7:
36.7"/33"x3.73=4.14 (a lot closer to a 4.10 than a 4.30)

Just for chits and giggles (as brought up earlier) a 36.3 BFG All Terrain:
36.3/33x3.73= 4.103 (hmmm... 4.10s anyone?)

Plan ahead for the variance in tires you might run, not just the set you have on there right now. What happens when the tires start to wear? Your Toyos probably started with a tread depth of 21/32nd... when you lose let's say 6/32nds of tread depth (and the tire is in effect now smaller than a 37), the 4.10s will still treat you better than the 4.30s.

Now the day to day... I drive a mix of back roads and interstate, but I hate having the truck screaming at interstate speeds. 70 on the interstate is fine in theory when talking rpms, but what's your driving style? I'm in a state where 70 is the posted limit, honestly I'm usually 5-10 over that, probably more sometimes since my speedo is so off. I still think the 4.10s are the best bet all around if you're sticking with 35-37" range and have a heavy foot.

I've got trucks from 3.73s on 35s to 5.13s with 44s (rarely sees a paved road) and a 450 on stock tires with 5.38s that never sees the interstate so I don't have to shoot myself.

BTW, if you're that concerned about drag racing, 37s and mud terrains are not your friend. Sure, it's fun to blow someone's doors off on occasion, but let's be realistic it's not going to be a dedicated track queen... that's not what this set up is known for. Most mud terrains have chitty speed ratings anyway. Your Open Country's are probably Q (rated up to 99 mph). Just sayin...

I agree with all of this^. My truck has 4.10s, and I'd be fine running them with 37's. If you're doing 70mph around here. You're getting passed like you're not moving