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Unread 07-24-2011, 03:49 PM   #1
Tdaz250
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How big of a difference do gears make?

Thinking for in the future if I get 32s or 33s how big of a difference do gears make. I have 31s right now with probably 3.55 and it's pretty slugish but not enough to justify dropping 1000 bucks on a vehicle that's only worth 3k if that.

I would basically just like to be able to drive in town and not feel like I'm straining everything when I go from every stop light.

Tia guys. I know there are alot of threads about gears but I haven't really found one that addresses my question.

Also I'm curious what gas mileage is like with 33s and 4.56 gears...I drive about 20 miles round trip per day and it's all in town.

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Unread 07-24-2011, 04:33 PM   #2
blackjack12982
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Why not get a set of axles out of a V8 ZJ? They're 3.73 geared, and if you get the later 96-98 model axles, you'd have a D44a instead of the D35. That being said, I'm still running 3.73 gears with 35's and my 5.2. I can definitely tell a difference, I can no longer light up the tires like I could on 2" and 31's, but it's definitely still drive it decently.
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Unread 07-24-2011, 06:37 PM   #3
biggoofy
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My 4.0 on 33s is so slow haha its drivable but not great on hills. if i planned to stay on 33s i would go 4.56 and stay there.
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Unread 07-24-2011, 07:19 PM   #4
Technohead
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Quote:
Originally Posted by Tdaz250 View Post
. . . I would basically just like to be able to drive in town . . .

Also I'm curious what gas mileage is like with 33s and 4.56 gears...I drive about 20 miles round trip per day and it's all in town.
Driving in town? Gas mileage? Sounds like you need a Honda.
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Unread 07-24-2011, 07:43 PM   #5
jforse
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Quote:
Originally Posted by Technohead
Driving in town? Gas mileage? Sounds like you need a Honda.
Lol
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Unread 07-24-2011, 08:00 PM   #6
KingtheZJ
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x2 on the 96-98 v8 axle swap.
or if you have the money and skill, go for the hp30/8.8 swap with 4.10s and ltd slip in the 8.8. that would be ideal and cheapest thing to get the farthest without having to regear axles.
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Unread 07-24-2011, 08:20 PM   #7
Tdaz250
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Do any 8.8s come with 4.10s stock ?

I know I'm saying gas mileage...but I was saying that in regards to I'm going to want gears with more power since mostly what the jeep does is stop and go when it's not on the trails
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Unread 07-24-2011, 08:25 PM   #8
blackjack12982
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Quote:
Originally Posted by Tdaz250 View Post
Do any 8.8s come with 4.10s stock ?

I know I'm saying gas mileage...but I was saying that in regards to I'm going to want gears with more power since mostly what the jeep does is stop and go when it's not on the trails
Yes, they are.

But 4.10 HP30's are pretty rare in my experience. I tried to find one for quite some time before I just got a 3.55 geared HP30 and regeared it to 3.73.
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Last edited by blackjack12982; 07-24-2011 at 08:25 PM.. Reason: made it less confusing...
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Unread 07-24-2011, 08:59 PM   #9
ratmonkey
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3.73's behind the 4.0 with 33's is still going to be sluggish.

4.56 or nothing imo.
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Unread 07-24-2011, 11:51 PM   #10
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I know it will make s world of a difference when I go from 3.55s on 35s to 4.56
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Unread 07-25-2011, 05:06 AM   #11
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Quote:
Originally Posted by Technohead View Post
Driving in town? Gas mileage? Sounds like you need a Honda.
But Jeep wins wars, Honda mows lawns
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Unread 07-25-2011, 05:13 AM   #12
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Quote:
Originally Posted by lateralus3 View Post
I know it will make s world of a difference when I go from 3.55s on 35s to 4.56
If ya planning 35s, 4.88s would match up better ratio wise. Even more so important sense you have the 4.slo. If ya had a v8 it would be so bad.

Gear price shouldnt change with the ratio chosen, having that little bit more of power with a little deeper gears it worth it.

Can neva go wrong with More Power.....
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Unread 07-25-2011, 01:14 PM   #13
gothchick
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I'm running 4.10 and 33's with a 4.0L. It's equivalent to the factory gear ratio, but I think it'd pull better on the highway with 4.56s. The difference between 4.10 and 4.56 is about 200rpm's.
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Unread 07-25-2011, 01:22 PM   #14
KingtheZJ
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FWIW, two of the guys (XJ and ZJ) in my club insist the other guys dont run 4.88 in d30s. they both installed 4.88s and within a year had stripped the pinion gears. when the ring gear is so small (like it is on a d30), the pinion has to get REALLY small to get the ratio that high (numerically). they push hard for the rest of the members to cap it at 4.56. its something to consider.
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Unread 07-25-2011, 02:32 PM   #15
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I've had 488s in my hp30 and 8.8 for 3 years now with some pretty serious rock crawling. I have an air actuated OX in the front and now, an ARB in the rear. No problems with either, but one has to use common sense to avoid a shock to the drive train. Don't let the front spin and don't get airborne. For highway running, I wouldn't want a lower ratio, even with my 5.2.
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