4rx

I hope this would help someone who decide to regear their vehicle and what sizes tires you want...

scuba

Doesn't help me.

4rx

It was meant for newbie who has no idea what to regear...

scuba

Its still a bad chart. It says 4.88's are the best for 35's.

camo31_10.50

at what speed are these rpms being recorded? lol it doesn't say that...

and the chances of this being for Toyota's is slim

i remember seeing one like this, but it was for jeeps

sl0annuggets

Yeah this seems off because I feel like I have no power and awful mileage with 4.10s 2.7 and 32's... But I have some exhaust work to do. So hopefully when I get all my parts in its golden.

xxxtreme22r

I agree, look at that chart, specifically for 31 right in the middle of the bad, best for mileage and performance it says 4.11 which might as well be 4.10.

Everyone knows the best gearset for 31's is the 4.56 which is the exact same gear that toyota used.

Using that chart it would say I get the better gas mileage by switching from the stock 28ish sized tire to my current 31, well. I think not......


ps, I found pretty much the same chart here: which actually answers camo's question about what speeds.

http://www.fjcruiserforums.com/forum...ger-tires.html

cr@ves4wheelin

Bumpin this thread, I just swapped in 4:88s to go with my 33s, and I hate going on the highway now. Gas mileage went down, to go 65+ the rpms go 3000+. I have a manual transmission. Just something for those people who are planning to regear to think about. Its nice for speed though. Also, speedometer is 5 mph higher than what my GPS said.

Both charts looked about right, based on my experiences from 4:10s and 33s, to 4:88s to 33s. I think 4:56 would've been better for my DD.

scuba

The difference between 4.56's and 4.88's would maybe be 100 RPM's

My truck tachs at right about 3000 RPM's at 70.
But with the added weight of the tires plus the added weight of armor and yada yada the truck needs it. These trucks like to REV.
If you want mileage then go buy a civic.

My stock mileage was 24.
Now I get 15 if I'm lucky. 14 most of the time.

85gijunk4x4

...chevy 6.2 diesel's ideal gear ratio for 37's is 4.56...

so this means since my truck has 4.88's i can pull hills better with 37's then a chevy diesel

cr@ves4wheelin

Haha good one, but that wasn't my point. Plus you have a newer truck, different engine, and different transmission. Just letting people know that 4:88s would be necessary if you ARE towing things behind you or if you go offroad frequently, but as a DD, IMHO, its not favorable.

MudHippy

3VZ-E(tuned), manual tranny, 35's, 4.30's = 22-23 MPG

Hate to say it(AGAIN!), but the chart's pretty accurate IMO. It says with 4.27 and 35s I should still be in the yellow(good fuel economy). And just below the blue(DD), which would be 4.56s or 4.88s. I couldn't agree more. I've always said you guys tend to err on the lower than necessary side as far as gearing for these trucks. I can honestly tell you that I'm perfectly happy with the setup I have at the moment. Like I've said on many occasions. If I feel the need for more torque offroad then I use 4Low. If I need to pass your slow ass on the highway I drop a gear and punch it. Works every time.

Scuba, you're so off base on this one it's not even funny...

scuba

The power numbers of your 3.0 (145HP and 180 FTlbs) aren't very different from my 2.7 (150HP and 177 FTlbs).
Not to mention, the 5th gear ratio of your R150F (0.838) is actually TALLER (making rpms lower) than the 5th in my W59 (0.850).

So your statement that we have a "much different truck" is not correct.

RPM's are not the only factor to MPG. Throttle position is a big factor too.
At a higher RPM and further in the torque curve, theoretically you would need LESS throttle position (therefore less fuel) than you would if you had to mash the gas because the gears are too tall and your not in the power band.

Maybe the problem is that you are running 31's (I think, no information in your build thread about specific tire size??!?) with 4.88's and a manual transmission. Stock 4Runners and Trucks of that era that had a 3VZE and the 31" tire option received 4.56's for 5 Speeds and 4.88's for autos.
So, your slightly over geared. Throw taller tires on. Your MPG might go up a little bit due to less RPM's at highway speeds but then again your adding more weight..

scuba

For the guys that actually use their trucks, 4.30's and 35's won't cut it.
Get to a steep mountain trail 8K+ feet up with 3ft boulders and let us know how you still like your gearing.

MudHippy

Gee that's interesting, I wonder how I kept up with that Audi going up the steepest grade hill in Clackamas county? Yeah, the one that I regularly overtake the V8 Jeeps and Fords on. It's over 10% too, more like 11-12%. Hmm...that's strange huh? Oh yeah elevation 3000'+

Just an FYI, there are no mountain trails in Oregon above ~4500' at best. The highest mountain pass is only a little higher than 6000'. Which I've been up and over without any troubles. So I guess I don't need to worry too much about nothing like 8000'+.

They're called rpms, USE THEM!

BTW, here's another Toyota specific chart, which also agrees with me(and the other charts): http://www.off-road.com/trucks-4x4/t...art-18931.html

cr@ves4wheelin

I have 33x12.50 tires, and yeah I know RPMs aren't the only factor for fuel mileage lol.

WILLTHISIFSGOHIGHER

So then what about my 4:56's with my 35's my mileage is ok but when I switch my 35x12.50 bfg at's to my 35x15.50 tsl sx's Im hating the freeway and have no extra ponies. I know its a crazy tire but it will take me anywhere I want to go, just not the speed I want to get there at. Im thinking at least 4:88 maybee even 5:29's

camo31_10.50

that's a dumb post....lol you're comparing a 12.50 wide tire to a 15.50 wide tire....it's A HECK OF A LOT HEAVIER.



i have 4.56's, 285/75's, 3vz, 5spd..and at 65mph (by the speedo) i'm right at 3000rpms. and at 70mph, i'm almost at 3250rpms.......this sound right? it was owned by a toyota offroad enthusiast before me, and i haven't verified the gearing yet, but it sounds like i have 4.88's (since Cr@ves has the same numbers i do, and he has 4.88's)


i do know that my 4runner isn't slow by any means lmao it's quicker off the line than my buddies '06 dodge 4door shortbed 4x4 truck, has the Hemi, and 35x12.50R20 Federal M/T's with rockstars....he catches me eventually, but off the line i smoke him everytime

Alberta4x

Guys usually recommend 4.56 for 31's, 4.88 for 33's, and 5.29 for 35's. This is for a 5 speed tranny, auto's need lower gears. Keep in mind that you guys are talking about different engines. If you have power, then it isn't really a problem to run oversize tires with high gears, and you'll keep your mileage up. But if you have a 22r, etc. with not very much power then you run into problems. With less power, gears affect you way more than if you have power to spare. There are also the other factors like the weight of the truck, weight and tread of the tires, even weight of the wheels can make a significant difference.

I agree that for a DD or a rig with more power it is fine to have higher gears (you'll be replacing clutches faster) but I've yet to hear about someone having fun driving with a 22r, 35's and close to stock gearing.

mt_goat

I've seen that chart before but it is NOT valid for our trucks. If you look at the original source for the chart it states it assumes a final drive ratio of 1:1. Toyota transmissions have over drives, the 5 speed is 1:1 in 4th gear and the auto is 1:1 in 3rd gear.

This is the best calculator for gearing I've ever seen. It has Toyota transmissions programed into it: http://www.ttora.com/forum/showthread.php?t=56784