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4.10 or 4.56

4K views 34 replies 17 participants last post by  MOz 
#1 ·
So, looking at upgrade and looking to regear.

Should I go 4.10 or 4.56 for a daily driver on 33" tires.

And if I go 4.56 in my D30 front will in need a new carrier..I have 3.73 gears now.

Thanks guys and gals for the input.
 
#3 ·
Assuming you're not running the 3-speed automatic, 4.56 will be ideal for your 33" tires. 4.10 will "work" too but that ratio is not as good of an all-around ratio for 33" tires as 4.56 is. 4.56 restores the power lost by installing bigger tires far more effectively than 4.10 does. :)
 
#4 ·
This is interesting for me to learn and it is along the same lines of what I have been researching this week. I have 33's and a 3.07 ratio and I was told if I wanted to go to a 4.10/ 4.11, that I would have to replace the differential. I was told basically that the new gears would not fit in the one that I have. I have a d35 and want to swap my 3.07 to something bigger, like a 4.11, or based on this conversation, maybe a 4.56. Anyone know what all I would have to buy to make the swap?
 
#6 ·
i believe the 4.10/4.56 will fit in a 3.73 carrier but not a 3.07
 
#10 · (Edited)
$1100-1200 is a fair price for everything to regear both axles. I paid just over $1200 my first time and just under $1100 the last time when I pushed a little harder. Economy-wise, there's not enough difference between 4.10 and 4.56 to worry about. On and off-road, the 4.56 ratio will be better with 33" tires than 4.10 would be. :)
 
#12 ·
i have a 4-speed automatic, 33" tires, and i went with 4.88 gears. fuel economy is better than the stock 3.73 gears, and i love the power i have.
 
#17 ·
i have 4.56 gears with 35s and my jeep has the 4spd auto tranny.
for me it works fine and i have a good gas mileage.
at 65 mph highway speed i have 2000 rpm in 4th gear with OD on.
that´s enough to hold the speed and to accellerate moderate without shifting.

but i live in a region without hills and mountains. in the mountains 4.88 or higher would be better.
 
#18 ·
you need both carriers in both d30 and d35. i would personaly go with 4.88. im in pretty close to the same situation you are in with the 3.07s. and thats what im going with
 
#27 ·
i have 3.07 gears 32in tires and a 3spd trans im only turning 2300 at 65mph. did you ever recalibrate your speedo after the 33in tires were put on. your rpms and mph dont match up :confused:
 
#20 · (Edited)
2700 RPMs are way too high for 3.07 and 33" tires at 65 mph, are you certain you don't have 3.73 instead? My calculator says it should be closer to 2000-2040 with 3.07 gearing, a 3-speed automatic, and 33" tires. Actually, 2700 RPMs at 65 sounds too high for even 3.73. When is the last time you calibrated or at least checked your speedometer for accuracy? :confused:
 
#21 ·
So are we all saying that now we are up to 4.88 gears? For every day driving and driving 2-6 hours to trails at hwy speeds...65-70mph?

That just sounds really high! But this is why I ask.
 
#24 ·
i get about 14mpg with the 4.88 and it is a daily driver. i went with the 4.88 because i live in pa and there is alot of hills.
 
#25 ·
ok so i have a 6 speed manual with 3.07 gears and a d30. im running 33's what would be i ideal gearing for me a buddy told me 4.88's??? i dont know anything about this stuff so could you let me know everything that i would need to do. thanks
 
#26 ·
i have 35s with a 4spd auto tranny (0.69 in 4th gear) with 4.56 gears. at 65 mph i have 2000 rpm in 4th gear. it works fine for me and i have a good mileage.

the 6spd manual tranny has 0.84 in 6th gear. that means that with the manual tranny i would have about 20% more RPM at the same speed.

with the powerful i6 and manual tranny i wouldn´t install 4.88 gears.in the small D30 only 2-3 teeth have contact in the diff. that´s not enough IMO. i´ve seen damaged 4.88s R&Ps in D30s with manual tranny.
with an auto trnny this wouldn´t be a problem. the torque converter compensates the torque peaks that you have with a manual.

i would go with 4.56 gears if i were you.
 
#30 ·
General question: I'm considering installing some new gears in my heep myself to save some cash. Can this job be handled by an "accomplished" mechanic. I've done a few motors and every other component .... except the trans ans axles.

What do you guys think?
 
#31 ·
I do all my TJ's work, just got through with a transmission conversion, do my own clutch jobs, suspension installs, etc., but I wouldn't tackle a ring & pinion installation unless I had an experienced R&P installer there with me showing me how and advising me step-by-step. This is one job I'd rather have done right the first time, it's just too painful if you don't get it done right.

With a well written guide like is on Randy's Ring & Pinion website and the right tools including a dial indicator for measuring and setting the backlash you could. But if you don't get it right the first time, the new R&P gears will be toast in short order.
 
#32 ·
MOz I would not advise without experience, I have been doing this for many years and it can still be a royal pain. There are so many variations of problems you can run into and you have several different type shims you would have to buy sets of to come up with the right combination. when it comes to being done and for it to last it can only be one way and that is exact pinion depth, pinion pre load, ring gear back lash. carrier brg pre load, and gear mesh pattern all have to be perfect and if you have to re adjust one well you just thru all the other adjustments off. save your time and money pay someone that has experience..good luck
 
#34 ·
Please bear with me and my reasoning, I would go to 4.88 if you are considering a regear. If your performance is lacking due to 3.73's or 3.07's and you have 33's now the 4.88's wil certainly perk that up and when not if in the future when you go to a larger tire you will not have to spend all of that money again. I would sacrifice a little MPG for the improved performance gained.

Now feel free to flame me if you wish. :wavey:
 
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