Opinons from 4.56 w/ 285,295,305 users

[xcmountain80]

Ok guys I'm pretty sure I know how the gearing system goes and 4.56's seem to be what I'm after. What I need is some knowledge on mileage, acceleration, top end, etc. while using 285, 295, or 305 tires. Please when you post let me know what type tire you are running because that will change the diameter. My brother just installed 4.88's with his 315 mt's and got his acceleration back as well as gas mileage and cant go over 90 without trying real hard. So since I'm using 33's or 285,295,305's 4.56 should keep me in a semi stock configuration.


Aaron

[YotaJunky]

I've got a 95 4Runner with 265/75/16 and have 4.56 gears. It has brought my odo and speedo back to stock. I've read that with 33's you may want to run 4.88's.

After swapping to 4.56's, I've found that acceleration is better, as well as climbing hills.

Here's a good website to do your calculations:

http://www.4crawler.com/4x4/4LoCalc.shtml

Troy

[bamachem]

the ratios in the transmissions of the 2nd and 3rd gens are different, so they can't compare in this arena.

i have 4.56's, and have used them with 285's, 305's and 315's. i really can't tell THAT much of a difference in any of the tires on them. i could tell quite a bit of difference when i went from 4.10's to 4.56's on the 285's though. i can cruise as fast as i care to go on them, except on steep grades on the interstate. on those, it will still kick down to 3rd to maintain 80-ish. overall, i like the combo.

[YotaJunky]

the ratios in the transmissions of the 2nd and 3rd gens are different, so they can't compare in this arena.

i have 4.56's, and have used them with 285's, 305's and 315's. i really can't tell THAT much of a difference in any of the tires on them. i could tell quite a bit of difference when i went from 4.10's to 4.56's on the 285's though. i can cruise as fast as i care to go on them, except on steep grades on the interstate. on those, it will still kick down to 3rd to maintain 80-ish. overall, i like the combo.


My bad. I forgot to check the category. That's what happens to me sometimes when I just hit the "new posts" button.

[sschaefer3]

Oh Howard-

Just get the 4.88's get those 315's on there, you know you want to.

:confused:

[xcmountain80]

Oh man oh man, well I'm running circles I wanted a SC then figure it would be too much then the 1UZ bug bit and well got more info and thats just not reliable enough which spun me full circle back to I need some damn gears! Oh no no Steve I just cant, I already have 2 sets of tires 295 Nitto Terra's and 285 Cooper STT's no more tires until lets see combined mileage 60k from now. Oh yeah and then I would need 1"-2" BL and man I just cant do it. I have to stay with the 33's besides where the heck would I tuck a spare 315? I am getting the 1st gen bar in soon and sourced out a tire holder but just to much neede for the 4.88's If bama is happy with the 4.56 so will I. Also to whoever doesnt know I have 4.10 which suck with the 285 and 295's I run though were ok with the 265 stock tires. Ok now to price out limited slip rear and 4.56 gears F&R.

Aaron

[bamachem]

steve has driven my truck w/ 4.56's and 305's as well...

[neliconcept]

ive riden in Rics truck with the 33s and 4.88s and it runs about 2600k i think around the 70ish range? not sure but he had way more acceleration then I did with my 4.10 rear. I plan on going 4.56 as well, it seems to be the ideal gearset for ppl who want to run 33s and no larger.

[xcmountain80]

The 305's were a just in case size comparison in the event that someone other than you 2 pros chimed in. I would love arb lockers when I do the gears but currently out of the question for the ole $ stand point.


Aaron

[d0ubledown]

it also depends on what tranny youve got in there now. im guessing 4.10 5sp? if youre running 295 (75's im assuming?) it'll measure out a bit more than 33's while 285's measure slightly under 33's. 4.88's for sure if you've got an auto. 4.56's for the 5sp. id do the 4.88's

FWIW, im running 4.88's on 315's and had 4.30's on 285's with an autobox. at an indicated 100km/h (62mph) im at around 2350~2540 rpm. with 315's and 4.30's i was chugging at 2000 even at 100km/h. i dont bother going over 65mph since our hwy system is non existant and at $1.30/L...its too damn expensive.

IMO...if you want to run lockers...dont regear yet... bank your coin till you can get lockers. stick with 285's n your stock gears n live with the luggishness...

OR..

buy my 4.30 diffs (rear elocker)...and run that as is. you'll at least have a rear locker & gears slightly lower than stock if youre 4.10's. or you can even regear em & add an arb up front n swap the diffs yourself...save heaps of coin on labour and not have down time on your runner. it really is silly to pay twice for labour if you do gears and no lockers (or vice versa)

[xcmountain80]

The main reason I listed the 3 sizes was because different manufactures have different "real" sizes. My 295's are 33.27 and my 285's are 33.1 thats why I have the two different sizes because they arent much different at all, nitto runs small and cooper runs on. I have an auto tranny, when you listed your speeds do have a speedo correction unit otherwise your speeds will varry somewhere btwn 7%-9% . And 62mph @ 2300 is not good I run 70 now at 2300. So unless you adjusted your speedo then your numbers might be off. Bama what are you getting mileage wise odo and fuel?

Aaron

[xcmountain80]

ive riden in Rics truck with the 33s and 4.88s and it runs about 2600k i think around the 70ish range? not sure but he had way more acceleration then I did with my 4.10 rear. I plan on going 4.56 as well, it seems to be the ideal gearset for ppl who want to run 33s and no larger.




Yeah 2600 @70mph is no good for gas, 4.56's maybe as soon as Bama reassures me what his numbers are.

Aaron

[xcmountain80]

Well shyt I got some numbers from bama, and not sure if I shouldn't just go with 4.88's. I do alot of highway 70-85 2200-2700rpm's. I was initially looking for a corrected gear ratio for the larger tires. Now I'm just confused.

AAron

[d0ubledown]

disregard your unadjusted speedo & tach readings and use this formula.

new tire/oem tire X oemgear ratio.

so for example my setup:

33/31 X 4.30 = 4.57 so if im going 33's, 4.56 would be stock ratio with the 33's.

35/31 X 4.30 = 4.85. with 35's...4.88 will give me stock performance.

i've got 35's on 4.88's...and guess what. it feels like stock, but not really as i know the larger heavier tires are weighing down. going the next step lower gear (numerically higher) will give you a bit more street pep and trail crawlability...but you'll sacrifice highway cruising rpm's. i didnt want to buzz at 3000rpm on the highway..so i stuck with 4.88's and didnt go 5.29's. at an indicated 70mph, im hitting about 2650rpm.

true, some tires measure slightly taller or shorter than their indicated or assumed size...so its all just a rough estimate.

[xcmountain80]

Well I know my speeds are adjusted or calibrated if you will, "SuperLift True Speed" and the Garmin GPS. That being said the calculation sows me I actually need 4.30's (33/31 X 4.10) = 4.33645. So I guess that makes sense. My brother is running 35's and 4.88's like you and loves it. Though I cant remember my stock size but now that I think about it 265/70/16 sounds right. that changes everything! (33/30 X 4.10) = 4.51


Aaron

[neliconcept]

4.43

265/70 are 30.5 inch tires

[xcmountain80]

Hmm well 4.43 isn't a ratio I'm familiar with. 4.56 and 4.30-ish in my last rig. So I guess the closest to that would be 4.56 which im not thrilled about the rpm's that go with it. Nelly hows your swap coming?