4.10 vs 4.88 with 315/70r17 on a 5th Gen?

[carlomagne]

Having a quick debate with a buddy regarding 4.10 and 4.88 gears with heavy 315/70r17 Nitto Ridge Grapplers on a 5th gen 4runner.

Taking into account the increased weight and rolling resistance of the tire versus stock sizing, would 4.10 or 4.88 be better? I've read that people with 34s do well with 4.56 and some even wished they went with 4.88. It doesn't make sense to me that 4.10 would work better than 4.88 with such a large and heavy tire.

 

[rdruss]

By how much do the tires referenced change the stock gearing? Choose the appropriate ratio to compensate, may be 4.10, 4.56, 4.88, it depends.

 

[comtn4x4]

Having a quick debate with a buddy regarding 4.10 and 4.88 gears with heavy 315/70r17 Nitto Ridge Grapplers on a 5th gen 4runner.

Taking into account the increased weight and rolling resistance of the tire versus stock sizing, would 4.10 or 4.88 be better? I've read that people with 34s do well with 4.56 and some even wished they went with 4.88. It doesn't make sense to me that 4.10 would work better than 4.88 with such a large and heavy tire.

There are no 4:10's available for a 5th gen so 4:56 or 4:88 would be your choices.

I think it would also depend on how heavy your rig is.

 

[carlomagne]

There are no 4:10's available for a 5th gen so 4:56 or 4:88 would be your choices.

I think it would also depend on how heavy your rig is.

Let's say they did make 4.10 and the truck has rack, full skids, and camping gear. I don't see how 4.10 would be more beneficial than 4.88. If anything, 4.56 might give better mpg but definitely not 4.10 with big 34s.

 

[comtn4x4]

Let's say they did make 4.10 and the truck has rack, full skids, and camping gear. I don't see how 4.10 would be more beneficial than 4.88. If anything, 4.56 might give better mpg but definitely not 4.10 with big 34s.

According to the gearing charts 4:56 is the way to go.
However, you don't drive a gearing chart. I'd hesitate to make a recommendation because I have no idea what your situation is. Saying you have rack skids etc doesn't mean much to me cause I can't quantify what your saying.

What I will say is 4:56 works great for me. My rig is definitely far heavier than your rig however my tires are lighter and smaller, although not much.

Maybe find someone who is set up close to what you want and see if they'll take you for a spin

 

[Jetboy]

There are no 4:10's available for a 5th gen so 4:56 or 4:88 would be your choices.

I think it would also depend on how heavy your rig is.

This ^ No 4.10 option. Choices currently produced are 3.73, 3.93, 4.56, and 4.88.

Personally - I think 4.10 would be the correct stock gearing for stock tire size. I have had both 3.73 and now have 4.56 gears. I have some 33" tires and some 34" tires. I have not had enough miles to give a full review. I don't know how the gear change will effect highway speed MPG yet. I suspect it will go down when empty. I'm hoping it may actually go up when towing my small camper. I thought the 3.73 were just fine off road. I felt the biggest issue was highway cruising and maintaining 5th and sometimes 4th gear at speed. Otherwise I would have been happy with 3.73 gears most of the time.

IMO the ideal ratio for my use would be 4.30. They are not available or I would have chosen that ratio. I would not probably have gone to 4.10 over 4.56 with 34" tires. For a 35" tire - I'd still go with 4.56 myself unless I were doing a lot of towing, racing, or was very heavy.

 

[rochmpr]

When I was running Toyo MT's in 285/75's (34.1"), the 4.56's were great. That was with full armor and everything. Since stepping up to 315/70's (General X3's and heavy), I find the 4Runner shifting more versus before and would really like to go to 4.88's now, just do not see that happening any time soon with the current investment. If making the investment, I would opt for the 4.88's and be happy.

 

[CODERNR]

When I was running Toyo MT's in 285/75's (34.1"), the 4.56's were great. That was with full armor and everything. Since stepping up to 315/70's (General X3's and heavy), I find the 4Runner shifting more versus before and would really like to go to 4.88's now, just do not see that happening any time soon with the current investment. If making the investment, I would opt for the 4.88's and be happy.

That's only a .3" measured height difference I believe. Do you feel that is just due to the heavier rotating mass?

 

[57buick]

I have 33" Duratracs and I just put in 4.88's and they are great. After driving awhile with the 4.88 I dont see any purpose in spending the money for just 4.56. Not a big enough difference.

On the highway now Im about 500 rpm higher than I was before at 70mph and everything under 70 just feels the way the vehicle is supposed to feel.

So in my opinion 4.56 gears nobody should bother with. either go 4.88 or nothing.

I do plan on going with 35" tires when these wear out, then Ill be back to the slow sluggish 4runner feel again probably

 

[4Running303]

I'm running 4.88's with 35" Falken Wildpeak MT's. These are some heavy tires. It holds 5th a lot better on highway speeds. I'm glad I went with 4.88's cause the truck is just so heavy. I also wanted to be able to crawl offroad...4.56 would be fine with 33's, but if you want to go bigger in the future go with 4.88's.

 

[jmf_tracy]

i'm running 4.56 with 34" tires and the magnusson supercharger.
It's perfect, I would not want 4.88

 

[baysta]

i'm running 4.56 with 34" tires and the magnusson supercharger.
It's perfect, I would not want 4.88

Does Magnuson have any guidance on which gearing to use with their superchargers? Or does anyone know whether or not you want higher or lower gears with superchargers in general? E.g. 285/75r17 with weight, people typically go 4.56; are you advised to stay stock gearing with the same setup, but with a supercharger? Or is it advisable to regear with a supercharger as well?

 

[Volke]

This ^ No 4.10 option. Choices currently produced are 3.73, 3.93, 4.56, and 4.88.

Personally - I think 4.10 would be the correct stock gearing for stock tire size. I have had both 3.73 and now have 4.56 gears. I have some 33" tires and some 34" tires. I have not had enough miles to give a full review. I don't know how the gear change will effect highway speed MPG yet. I suspect it will go down when empty. I'm hoping it may actually go up when towing my small camper. I thought the 3.73 were just fine off road. I felt the biggest issue was highway cruising and maintaining 5th and sometimes 4th gear at speed. Otherwise I would have been happy with 3.73 gears most of the time.

IMO the ideal ratio for my use would be 4.30. They are not available or I would have chosen that ratio. I would not probably have gone to 4.10 over 4.56 with 34" tires. For a 35" tire - I'd still go with 4.56 myself unless I were doing a lot of towing, racing, or was very heavy.

Where do you get 3.93 gears? I've only been able to find 4.56 and 4.88.

Does Magnuson have any guidance on which gearing to use with their superchargers? Or does anyone know whether or not you want higher or lower gears with superchargers in general? E.g. 285/75r17 with weight, people typically go 4.56; are you advised to stay stock gearing with the same setup, but with a supercharger? Or is it advisable to regear with a supercharger as well?

There's no real right or wrong. It depends what your goals are and what you think the ideal balance of acceleration/pulling power and MPG/cruising RPM is. Lower gears(numerically higher) will have better acceleration, better towing ability and will be better for crawling slowly off road, but the highway cruising RPM will be higher and highway fuel economy suffer. It comes down to personal preference.

 

[Jetboy]

Where do you get 3.93 gears? I've only been able to find 4.56 and 4.88.

3.93 is an OEM ratio that comes in the gx460 and prado 150 models. It was also used in the MT version of the fjcruiser. They're cheap, but only about 1%different, so im not sure swapping would be worth the effort.

 

[Volke]

3.93 is an OEM ratio that comes in the gx460 and prado 150 models. It was also used in the MT version of the fjcruiser. They're cheap, but only about 1%different, so im not sure swapping would be worth the effort.

Depends what you're going for. It's actually 5.4% lower which when combined with 285/70 still ends up a little lower geared than 3.73 on 265/70, and exactly the same overall gearing as stock when on 295/70. It's not a bad option for mall crawlers and dailies near stock weight that are okay with stock acceleration and want to keep the highway fuel economy impact of 285/70 or 295/70 tires to a minimum.

 

[4RunnerAquasport]

This a Jeep site but the algorithm doesn't care Toyota or Jeep.
Gear Ratio Calculator

 

[Brandon H]

On my previous rig (2nd gen tacoma). I was locked front and rear on 35's and i had 4.56 gears. It was just about right. I think if you are going bigger (37s) you might want to look at 4.88s

 

[jmf_tracy]

Does Magnuson have any guidance on which gearing to use with their superchargers? Or does anyone know whether or not you want higher or lower gears with superchargers in general? E.g. 285/75r17 with weight, people typically go 4.56; are you advised to stay stock gearing with the same setup, but with a supercharger? Or is it advisable to regear with a supercharger as well?

Magnuson gives no guidance whatsoever on any subject. I've called them before to ask if the supercharger was compatible with the safari snorkel - no help whatsoever - seemed like i was bothering them.

The gearing has to do with wheel size, weight and intended use - nothing to do with the supercharger. Having more horsepower helps by making it easier to drive.

If your T4R is an overland vehicle and not a dedicated rock crawler and have 33" ~ 34" tires then 4.56 is the tallest gearing that you would want to go.

Like the guys at Marlin Crawler told me when they re-geared my T4R and i asked about putting 4.88 gearing: "are you gonna trailer your 4runner?"
no
"then 4.56 is the tallest that you want to go so you can still drive it on the freeway"

This has proven to be very true.
I can only go about 80 ~ 85 mph on the freeway before it feels like it is going too fast for the vehicle.

 

[Jetboy]

What would be very useful is a fuel consumption map for the dual vvti 1GR. I don't know that I've ever seen one. I also think 4.88 would be too low for comfortable or efficient highway travel with 34" tires. The 1GR is rough at higher RPMS. My bet is that fuel consumption map shows a significant increase in consumption around 2500rpms and up. At 85 you're going to be over 3k rpms. Without a BSFC map for this engine I have no idea what that means for fuel efficiency. If the engine were similar to something like the GM ecotec 4.3 - you'd expect about a 15% drop in fuel efficiency purely as a result of lower thermal efficiency - making the same power, it uses quite a bit more fuel. The problem is that I don't know what that map looks like for this engine. It could be a 30% hit, could be zero. Just don't know. My gut tells me that the efficiency drops fairly rapidly around 2500 rpms and up. It is not a free revving motor like the 2GR. I think the 3rd gen Tacoma for example would be much more friendly to low gearing.

 

[Jetboy]

Depends what you're going for. It's actually 5.4% lower which when combined with 285/70 still ends up a little lower geared than 3.73 on 265/70, and exactly the same overall gearing as stock when on 295/70. It's not a bad option for mall crawlers and dailies near stock weight that are okay with stock acceleration and want to keep the highway fuel economy impact of 285/70 or 295/70 tires to a minimum.

They're inexpensive because the carrier is different offset to the mounting flange so you can't re-gear them with any of the common gear sets. I want to say the OEM 4.56 gear set might fit the rear, but I cant remember for sure. What matters is that they're not a desirable used part. I'd guess you could buy both front and rear diffs for $500 or so. I don't think you'll find a rear e-locker version in north america. So the e-locker axle the 3rd member housing will not be interchangeable, nor will the carrier fit the e-locker housing (the driver's side bearings are different size). But if you had an SR5 or Limited you could probably swap them in for not a lot of money.

Edit: Also I mis typed. It's a 3.91 ratio (43/11).

The front 8" clamshell has essentially a full range of options. Including 4.10 - which would be a good option IMO. It's the rear 8.2 that is lacking many ratios. I believe Circle K is the only non-OEM gear manufacturer for the 8.2 - so all gear brands are really the same rear diff gears. I don't know what the minimum order would be for a run of 4.10 rear gears.