FOXxX

Is it really worth changing the stock 3.55 to 4.10 for 33's? I dont plan on going larger than that but wanted a 2nd opinion. Its my daily driver and I dont want to spend the time and money on making the change if there is no significant difference. Can I get some testimonies please? Can I get an AMEN!

gpXJ

I read on a thread somewhere, just yesterday, that if you weren't going to make the jump to 4.56, then sticking with the 3.55 was just as good. Someone said they went to 4.10's and couldn't really tell a big difference over the 3.55's.

Believe the suggestion was if you were planning on a possible rear axle swap and could find an 8.8 with the 4.10's, then it would be worth matching the front up, but otherwise not a huge difference.

j-rod

i would have to agree. i wouldnt spend the money on parts and labor to regear to 4.10 from 3.55

BotakBeng

Hope this help.

FOXxX

This is all the info I need! Thanks guys. I didn't think it was necessary with all of the gear calcs I've been playing with but I wanted some testimonies!

djlarroc

If 33s on 3:55s was just fine, no one would regear.

The only reasonable way to only go 4:10s is doing the 8.8 swap and matching the front. That is what I did, but on 34s, found it unbearable. Power loss was not so bad, but I was getting 10 mpg. If you do a regear, go 4:56+

posjeepxj

puts ya a hair less than stock gearing

http://www.jeep4x4center.com/jeep-ti...atio-chart.htm

1tonxj

Geez I swear if they made 7.17's for the d30/8.8 you would have guys beleiving 4.88-5.13 was under geared for 33-35's ...

N20jeep

That chart uses a 1:1 ratio, its not right for an xj transmission

N20jeep

What are you talking about

magator

Sorry but you guys are very confusing. I guess its intentional. I can't seam to get a straight answer ether. I have a 94 XJ , auto,4.0, and with 33s.. I lost a lot of power on the Highway.. Its constantly changing in and out of overdrive. MPG dropped to 7-8 city 12-13 HW. Changing from stock 3.55 to 4.10 has to make a difference.. Would 4.56s be more like stock with the 33s????/ Lets be serious guys> Thanks

N20jeep

Yes 4.56 would help

Try this chart, they dont have an aw4. But picking the ax-15 will give you a close enough answer


http://www.manoian.net/jeep/gear_ratio_calculator.html

1tonxj

For the OP a simple way to look a tire size/gearing is for every 1 inch +or- you change your gearing by 1/10th ...so 3.55 with 28 inch stockers going up to 33's is like making those 3.55s a set of 3.05's ,so gear wise 4.10 r/p would make for 3.60 ,which basicly equals stock 3.55 gearing . I don't think a set of 33 radials on near stock weight axles like a 30/8.8 combo makes for enough extra weight/rolling resistance to justify the need for near 5 series gears ...now going deeper does makes sense b/c we all know 33's will become 37's ,So why waste money on multiple re-gears ,but on a d30 I caution against deeper than 4.10 because the deeper the ratio gets the smaller the PINION GEAR GETS and the d30 already has a small r/p and 4.56-5.13's pinion on a d30 looks like an acorn ,So if you need gearing for tires bigger than 4.10 you need to 86 the d30

1tonxj

It's now like having 3.05 gears ...don't use OD just use 3rd now

aw4 trans gearing
2.80 1st gear
1.56 2nd I think
1.1 3rd so -3.55 now like- 3.05
.75 4TH (OD)

djlarroc

Yes dude we've all heard your story, but fact is, I've never heard of guys complaining about having too much torque, or getting stock mileage w/oversized tires. And if you live where there's some biga$$ hills like CO, the deeper gearing is welcome.

If you are at sea level, then yeah, 4:10s would prob be ideal for 33s. I'm saying I followed all the advice that 4:10s were good for 33-35s and it sucked.