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I am looking at jeep dana 30's from yj's and some say 4.11 and some say 4.10? did jeep realy put a 4.11 and a 4.10 or are they the same?
 

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I have heard you can run 1% on the road and 2% difference off road, with no adverse effects, per Randy of Randy's Ring and Pinion.

"as long as the front and rear ratios are within 1% that the vehicle works just fine on the road, and can even be as different as 2% and work just fine off-road with no side effects"


Jeremy
 

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you'll be fine with 4.10's in one axle an 4.11's in another, because if you divide the number of ring gear teeth by the number of pinion gear teeth it isn't always going to give you exactly 4.10 or 4.11, those are usually numbers rounded to the nearest hundreth.
 

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The reason for the very slight differences in axle ratios like 4.10 and 4.11 is because of the slight ring gear diameter difference between the front and rear axles. It's just not cost effective for the gear manufacturers to try and make the ratio exactly the same since that slight .01 or so difference doesn't affect anything.
 

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the difference between 4.10 and 4.11 is that 4.10s have 41 ring gear teeth and 10 pinion teeth. 4.11s have 37 ring gear teeth and 9 pinion teeth. same way that 45 ring gear teeth and 11 pinion teeth will give you 4.09s.

"The reason for the very slight differences in axle ratios like 4.10 and 4.11 is because of the slight ring gear diameter difference between the front and rear axles. It's just not cost effective for the gear manufacturers to try and make the ratio exactly the same since that slight .01 or so difference doesn't affect anything."

does your ass hurt from pulling that out so fast? :eek:

:flipoff2: :p
 

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manhattanjeep said:
I have heard you can run 1% on the road and 2% difference off road, with no adverse effects, per Randy of Randy's Ring and Pinion.

"as long as the front and rear ratios are within 1% that the vehicle works just fine on the road, and can even be as different as 2% and work just fine off-road with no side effects"


Jeremy
How often do you drive on pavement in 4wd?:rolleyes:
 

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I DO NOT recommend trying this but.....
one day a buddy of mine and I went out wheeling. his toyota (81, SBC 350/TH350/203, 35" BFG's) had a 3.90 in the rear and a 4.10 in the front (only a temporary setup, for sure!) well needless to say, we hit pavement to go home, and his transfercase would not disengage! so we "unlocked" the hubs, assuming the problem solved. well his truck drove really crazy, pulled really hard and stuff. we couldnt figure out what it was. pulled the hubs off, and they were stuck locked! nothing broke, even after driving on pavement.
 

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WillyPete said:
the difference between 4.10 and 4.11 is that 4.10s have 41 ring gear teeth and 10 pinion teeth. 4.11s have 37 ring gear teeth and 9 pinion teeth. same way that 45 ring gear teeth and 11 pinion teeth will give you 4.09s.

"The reason for the very slight differences in axle ratios like 4.10 and 4.11 is because of the slight ring gear diameter difference between the front and rear axles. It's just not cost effective for the gear manufacturers to try and make the ratio exactly the same since that slight .01 or so difference doesn't affect anything."

does your ass hurt from pulling that out so fast? :eek:

:flipoff2: :p
Apparently you don't understand (or chose to ignore so you could make that comment) that the root cause for the difference in teeth count are the ring gear diameter differences. They don't just make up the number of teeth they want to have... there's actually a reason for the difference in the tooth counts on those different ring gear sizes :rolleyes:
 

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Jerry Bransford said:
Apparently you don't understand (or chose to ignore so you could make that comment) that the root cause for the difference in teeth count are the ring gear diameter differences. They don't just make up the number of teeth they want to have... there's actually a reason for the difference in the tooth counts on those different ring gear sizes :rolleyes:
since you and a few other people (in other threads i've been in) seem to have this misunderstanding...

RING GEAR DIAMETER DOES NOT EVER, EVER CHANGE (for a given axle type such as d44, 9", 14b, etc)

got it?

the only gear whose diameter ever changes is the pinion gear.

the pinion gear size is only going to change a few thousandths of an inch anyway for a set of similiar gear ratios (e.g., 4.09, 4.10, 4.11)

the "root cause" as you put it for the number of teeth on each gear is a manufacturer's whimsy. one day i could wake up and decide to produce 4.09s, the next day i might want to make 4.10s (that's simplified, but you get the idea).

so don't got rollin those little pixelated eyeballs at me when you don't know what you're talkin bout, mkay?
 

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I think they meant difference in ring gear diameter between front and rear axles - such as D30/D44 or D44/9" and thus different ratios front and back.
 

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4x4Guy said:
I think they meant difference in ring gear diameter between front and rear axles - such as D30/D44 or D44/9" and thus different ratios front and back.
you can still get 4.10s. 4.09s, and 4.11s for a d30, d44, and 9"

gear ratio depends on the gear manufactuer. some will make 4.11s while other decide to make 4.10s. hell, i've even seen 4.08s for a ford 8.8 rearend.
 

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The ratio is the number of teeth on the ring gear divided by the number of teeth on the pinion gear.

Some have the exact same tooth count and one manf. will label as a 4.10 the other 4.11

The 2% rule is true. (Go measure your tire diameter from front to rear, there will be 1 tp 2% difference in those too)
 

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WillyPete said:
since you and a few other people (in other threads i've been in) seem to have this misunderstanding...

RING GEAR DIAMETER DOES NOT EVER, EVER CHANGE (for a given axle type such as d44, 9", 14b, etc)
For God's sake, you still don't understand we're talking about the difference in diameters between a typical front and rear axle? Cripes, no one is saying a ring gear diameter changes within the same axle. Sheesh. :rolleyes:
 

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wanderingwillys said:
Same!

(actually they are 0.2439% different - more variation in tires alone- you can run up to 3 or 4% difference comfortably)

Matt :flipoff2:
There are 18 post on 4.10vs4.11 when the first post answered the question.
 
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