greatskiiiier

ok, so i want to know just how slow my car will be with 4.10s and 33s- i did some intake and exhaust work, cleaning out the tb/ intake, and the engine n clutch only have 35k miles on em-

anyone running this combo- how much trouble do you have on the hwy and going uphills? is it 100% unsafe or is it just slow

jay351 has been giving me some expert advice and id like to thank him for sharing, but for this thread i only want first hand experiences

THANKS!

eighty5yota

its not bad.. its all about keeping your momentum.. remember your not in a vette.. my 3rd gear is out so i shift around it.. and its still not that bad..

89silverpu

I ran this combo before I got my gears in my truck. About 2 weeks. I do not recommend it. Sure it's fine for driving around town and you may not feel a huge difference when you're just driving normally, but as soon as you need to accelerate it sucks! Getting on the freeway can be dangerous, forget trying to pass someone, you'll be going up mountains in third gear, and your clutch will take a lot of wear and tear on and off road. Speaking of offroad, the clutch will have to be ridden to get over the smallest rocks, and you loose a lot of power offroad....I HIGHLY recommend regearing.

myyota

My cousin has an 86 4Runner with Dana 60`s front and rear with 39x12.50-16 tires and 4.11 gears and his truck has no problems at all in any gear, he also has duel cases but i don`t think that makes much of a diference on the highway.

Master Yota

Im running 4.11's with 37" superswampers....it works fine for me on the highway, i can hit 100 mph, only because ive got 12lbs of boost into it. lol. get 4.88's or 5.29's or just stick a turbo on the damn thing.

toyNG

It's not as bad as people on here generally make it out to be, but I'm still gonna regear to 488s.

Stuwy123

iTrader: (1)

I went from 225/75r 15 to 31's on steel rims. 22re. It was manageable but really annoying merging into traffic and any sort of hill.
I just recently put 4.56's in it. Still on 31's. It rev's a little higher. Speedo's about 5km/h fast. I'm loving the extra acceleration. It's better than stock now. It's great but we'll see what highway's like tomorrow.

desertcamper67

Its like driving in one gear too high. No power or acceleration. I broke my ring and pinion but had a spare stock 3rd. Swapped in the stock one to get around on until my gears came and were set up. It was most noticable when climbing steep short paved city streets and longer freeway hills. Forget about shifting up while going uphill. Rpm's too low. 5th gear was practically useless.

PlugItIn

i have 32's and its not too bad. I live in a very rural area so no freeways at all. Its manageable...

Duckie

I'm used to it right now. I'm running 4.10s with 33x12.5x15s. I'm getting about 16.5mpg. It is hard on the clutch though, I have to feather everywhere from a stop. 4.56s will be coming sometime for sure. (Btw, I'm 100% city driving, never go on the freeway.)

greatskiiiier

thanks for everyones opinions- keep em coming!!!!

anyone run 33x9.5s? they weigh less than 31x10.5s maybe thatll be a better swap

blueyota38

im running stock gear to on 33x12.5 and it lugs after 4th gear but not bad the only reason why i dont want to regear is because im worried ill loose my gas mileage and top end. how fast could i run at a fairly low rpm on the interstate with 4.56 or 4.88s?

NMMarauder

I have crunched the numbers for my truck (also a 1994) and here is what I came up with. I used 4000 RPM for 1st-3rd because I almost always shift before that. I also wanted to know at what RPM would 85 miles per hour work out to because that is about the fastest I would go on the interstate in 4th or 5th.

Stock Tires 28" 4.1 Diff ratio
Gear RPM miles per hour
1st 4000 20.7
2nd 4000 38.3
3rd 4000 59.3
4th 4140 85.0
5th 3520 85.0

33" Tires 4.1 Diff ratio (same rpm as above)
1st 4000 24.2
2nd 4000 44.7
3rd 4000 69.2
4th 4140 99.1 (I don't think my truck could go this fast)
5th 3520 99.1 (I know for sure it couldn't do this in 5th)

33" Tires 4.56 Diff ratio
1st 4000 21.7
2nd 4000 40.2
3rd 4000 62.2
4th 4140 89.1
5th 3520 89.1

33" Tires 4.88 Diff ratio
1st 4000 20.3
2nd 4000 37.5
3rd 4000 58.1
4th 4140 83.2
5th 3520 83.3

The bottom line is that if you want to drive over 60 MPH you probably need to re-gear. So 4.56 would get you slightly higher than stock and a 4.88 would get you slightly lower than stock. I'd go with 4.88. Slightly under will give the truck a little more pep than slightly over. Just MHO.

blueyota38

thanks for the help ill deside on it here soon might just have to get me some gears. I was just worried i wouldnt be able to do the interstate speed and that my gas mileage would drop dramatically.

greatskiiiier

NMMarauder- ive been crunching numbers all week for my friends Rubicon (33" v 35" lol)
and although your calculations are current, the goal is to see how low of an rpm you can be at on hwy speed and still have power (2300rpm+)
4000rpm is higher than most people shift- but that does make a good baseline

blueyota- regearing to 4.56 will not hurt you in anyway, itll just cost you a butt load of cash

EDIT: just crunched the number with 33x9.5s vs the 31x10.5s- and 5th gear will be useless but ill be fine in 4th going anywhere, also being that each tire weighs 1lbs less i think ill be good to down in the city as well- oh and the mph in first gear are nearly identical 31-33 so crawlratio wont be harmed

desertcamper67

I can run 90mph (and probably faster) with 32's and 4.88's. I don't do it often but 80-85 isn't uncommon. Still, I can hit the skinny pedal at 80 and feel some acceleration. Not a lot but some. It'll get a little weaker when I get some 33's on there.
No tach so I don't know my RPM's. Don't care either.

Toyota's are happier revving than bogging.

89silverpu

Find some factory 4.56 third members and it can be done for under 500 bucks easily!

If you are freeway driving alot, on a 33x10.50, I would actually go with a 4.56. I cruise around 65 (speedo is off so 65 is a guess, speedo says 70) at around 3000 rpm's. This may be different for a 33x12.50 because the tire is heavier, but a 4.56 on a 33x10.50 I think would be the best set up for lots of free way driving. The 4.88's are great for in town, acceleration, and offroad, but 3000 rpm's at 65 is kinda lame, I just learned that takin it slow is the best way to go in these trucks when it comes to bigger tires and gearing. I get 24 mpg on the freeway with 33x10.50's and 4.88's goin around 65.

As for top speed, I can hit 90 easily in 5th gear 4500 rpms

NMMarauder

I got that. But that calculation is lots harder. You need to know the rolling resistance and drag from air resistance for a particular speed. Let's say it takes 90 HP to maintain 85MPH on flat ground. Then you can try to work backwards and see if the gearing will put your motor in an RPM range where it actually has 90 HP available.

But that still doesn't tell you everything because the drag from air resistance isn't linear so it may take 115 HP to push 90MPH. Not to mention hills.

That's why I had to crunch the numbers the way that I did. It just gives you a ball park and from the numbers you can see that 5th gear is essentially useless if you have 33" tires and 4.11 diffs. Especially if you live at altitude. I'm already experiencing an 18% drop in power from the altitude. If I put 33's on my truck I'm not even sure that 4th gear would be usable. My truck would become a 3 speed.

greatskiiiier

haha ok i take back my comment on crunching numbers- i just punched everything into a top speed calculator and set the redline as 2000rpm, 2500rpm, 2700rpm, so on and so forth

based on driving the truck i feel that before doing any mods i couldnt drive it under 2000rpm and anything between 2000-3000 was my usable power band (above is only excess power)
now after the mods i feel that 1500rpm+ is usable, but 2000-3000 is better for normal driving- so that what i based my math on

blueyota38

i dont do much freeway driving so do yall think 4.88 would be better. today i got 19 mpg on the highway doing between 45 and 70. Would i do better on gas with 4.88 if im usually in a spot were the limit is 55?