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4.56 gears with 30"s?
- Thread starter nates94xj
- Start date
swbooking
NAXJA Forum User
- Location
- Riverside/Running Springs, Ca
I wouldnt do it. Your RPMs will be very high at highway speeds.
Why not just sell the 30s and move to a bigger tire?
Why not just sell the 30s and move to a bigger tire?
- Location
- Hammertown, USA
4.56 and 32's works out really well, but with 30's you'll be spinning a little on the fast side.
Hmm. Just ran the calculator. 3,000 RPM would be 78 mph. Thats not as bad as I thought.
A little high, but doable.
Hmm. Just ran the calculator. 3,000 RPM would be 78 mph. Thats not as bad as I thought.
A little high, but doable.
Its not as bad as you might think. I run that on the highway each day on my way to work. Average between 17-19 mpg. It does feel a bit gear bound though. Aftermarket air cleaner would probably help the engine rev a bit better. I run about 2500 @60-65. It never needs to downshift out of overdrive.
- Location
- Seattle, WA
I run 4.56 with worn 31's that are worn much closer to 29.5" right now. 70MPH is right around 2800 RPM. A little high for my taste, but the mileage is still reasonable - about 18 MPH on the freeway, 14 street. The torque is sweet.
Built2Flex
NAXJA Forum User
- Location
- d
That's what I was going to say.
GinisKratos
NAXJA Forum User
- Location
- Centralia, WA (Olymipa)
damn with stock tires and 3.55 stock gears, I was running 70mph at about 2600 to 3k depending on the road (with a 3in lift) I run it about 2200-2500 at 60 with 31s.
CanMan
NAXJA Forum User
- Location
- Lake Tapps, WA
CanMan
NAXJA Forum User
- Location
- Lake Tapps, WA
You'll be fine until you get a taller tire. Too much traffic in WA to go fast anyways. Unless you live on the eastside.
mecompco
NAXJA Forum User
- Location
- Fairfield Maine
I ran my 235x75s ATs (~29") with the 4.56 gears for about six months until the 33s went on. It really wasn't that bad, even on the Interstate.
JAS
NAXJA Forum User
- Location
- Ann Arbor, MI
I just put 4.88 in for my 31's... I do have plans for bigger tires but It should be workable while I make plans to move from 31's to about 33s or 34s.
It is a jeep. It sees about 1,000 miles per year and I typically only drive about 65 on the freeway anyway.
They are still not under the jeep but I really think that 31's + AW4 + 3.55 really bites the big one.
It is a jeep. It sees about 1,000 miles per year and I typically only drive about 65 on the freeway anyway.
They are still not under the jeep but I really think that 31's + AW4 + 3.55 really bites the big one.
The very low ratio of the stock XJ may have as much to do with making good smog numbers. As good MPG. As well as less noise, engine wear. Also most engines made in the US of A are balanced anywhere from 800 to 1500 RPM so vibes can come into play as well. The factory boys have a lot more to think about when picking a final drive then just torque and MPG.
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