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Old 01-16-2013, 09:05 PM   #1
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gear ratios?

I have a 98 tj with Dana 30/35 I plan on keeping the danas just upgrading them. I bought the jeep a few months ago and for some reason he put a locker for the 307 for the 35 so I plan on taking that locker out and changing it. I plan on running 33 12.50x15. I'm thinking a 4.10 ratio would be good for daily driving and fun in the woods opinions anyone?

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Old 01-16-2013, 09:35 PM   #2
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I have a 98 tj with Dana 30/35 I plan on keeping the danas just upgrading them.
I thought the only way to upgrade them was to replace them.


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Originally Posted by DPayne89 View Post
I bought the jeep a few months ago and for some reason he put a locker for the 307 for the 35 so I plan on taking that locker out and changing it. I plan on running 33 12.50x15. I'm thinking a 4.10 ratio would be good for daily driving and fun in the woods opinions anyone?
Try running some gear ratios in my calculator: Gear Ratio Calculator. Plug in the factory setup and try out the different ratios with the tire size you want and see how they compare.

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Old 01-17-2013, 09:58 AM   #3
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The D35 is the one that is weak the D30 up front is good to go. Most replace the rear with an Ford 8.8 but there are a lot of folks who have no issues with the D35. So it is a matter of what kind of wheeling you do and how bad has the TJ been beat since it was new. If your nice with the skinny pedal all is good. Mine has 120K running 33s and no issues but I do alkways think about throwing some trail spare axles in the back for the long desert trips. If you have an I6 4:10s would be great if you have the 2.5 go for the 4:88s.
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Old 01-17-2013, 02:12 PM   #4
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Do you have the 2.5L or the 4.0L? and what trans?
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Old 01-17-2013, 06:46 PM   #5
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The D35 is the one that is weak the D30 up front is good to go. Most replace the rear with an Ford 8.8 but there are a lot of folks who have no issues with the D35. So it is a matter of what kind of wheeling you do and how bad has the TJ been beat since it was new. If your nice with the skinny pedal all is good. Mine has 120K running 33s and no issues but I do alkways think about throwing some trail spare axles in the back for the long desert trips. If you have an I6 4:10s would be great if you have the 2.5 go for the 4:88s.
Its been pretty well taken care of I'm just a normal off roader nothing extreme that's why I'm not switching. Yea I'm thinking about spares as well and thanks I glad someone agrees with 410s lol
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Old 01-17-2013, 06:47 PM   #6
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Do you have the 2.5L or the 4.0L? and what trans?
I have the 4.0 manual trans
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Old 01-18-2013, 11:13 AM   #7
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4.10 gears with 33s will get you pretty close to the same powerband that you would have with 3.07 gears and 235/75/r15 tires. It's a good choice for you if you're wanting that stock powerband back when you go bigger.
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Old 01-18-2013, 11:29 AM   #8
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Quote:
Originally Posted by DPayne89
I have a 98 tj with Dana 30/35 I plan on keeping the danas just upgrading them. I bought the jeep a few months ago and for some reason he put a locker for the 307 for the 35 so I plan on taking that locker out and changing it. I plan on running 33 12.50x15. I'm thinking a 4.10 ratio would be good for daily driving and fun in the woods opinions anyone?
I have a 06 4 cyl with a 6 speed and I just got 33s about a month and a half ago. Since I have the 2.4L I went with the 4.10s. It basically put me back to original gearing, I actually have a little more power than before in all gears. The highway is a killer now though, at 60 MPH Im running a little more than 3000 RPMs in 6th gear. That little 4 cyl really hums and if I come down the mountain I can go 75 and then I can just watch gas gauge move. My point being, with a 6cyl Im not sure youll need 4.10s. Maybe a gear ratio lower. That way you'll probably have stock gearing back and still have a lower RPMs in the higher gears thus saving a little a gas. Im for sure not an expert on this, but thats just my 2 cents.
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Old 01-19-2013, 10:36 AM   #9
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4.10 gears with 33s will get you pretty close to the same powerband that you would have with 3.07 gears and 235/75/r15 tires. It's a good choice for you if you're wanting that stock powerband back when you go bigger.
I honestly don't know how the stock felt I bought the jeep with slightly bigger tires it has 31 10.50 15s now and runs alright kinda bogs a bit. That's why I'm thinking going up to a 33 tire with 4:10s would be a good fit
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Old 01-19-2013, 10:39 AM   #10
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I have a 06 4 cyl with a 6 speed and I just got 33s about a month and a half ago. Since I have the 2.4L I went with the 4.10s. It basically put me back to original gearing, I actually have a little more power than before in all gears. The highway is a killer now though, at 60 MPH Im running a little more than 3000 RPMs in 6th gear. That little 4 cyl really hums and if I come down the mountain I can go 75 and then I can just watch gas gauge move. My point being, with a 6cyl Im not sure youll need 4.10s. Maybe a gear ratio lower. That way you'll probably have stock gearing back and still have a lower RPMs in the higher gears thus saving a little a gas. Im for sure not an expert on this, but thats just my 2 cents.
I appreciate the 2 cents lol. The big difference here is that I don't really do a lot of interstate driving, I mainly drive in the city you know never exceeding 55 maybe 60. So I don't think I'll run my motor out as tight as you do. What gear ratio did your 2.5 come with?
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Old 01-19-2013, 02:01 PM   #11
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Originally Posted by DPayne89

I appreciate the 2 cents lol. The big difference here is that I don't really do a lot of interstate driving, I mainly drive in the city you know never exceeding 55 maybe 60. So I don't think I'll run my motor out as tight as you do. What gear ratio did your 2.5 come with?
3.73 I believe
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Old 01-19-2013, 03:17 PM   #12
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For the 4.0L, 5 speed, and 33s, 4.56 is ideal. Not sure if they make gears that low for the D35 and I imagine it would be easier to break it.
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Old 01-19-2013, 03:21 PM   #13
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For the 4.0L, 5 speed, and 33s, 4.56 is ideal. Not sure if they make gears that low for the D35 and I imagine it would be easier to break it.
Yea they make 4.56 for it but if have to agree 4.56 seems a bit to much torque that's why I'm still thinking 4.10
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Old 01-19-2013, 03:35 PM   #14
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I got a 2.5L with 4.88 gearing and 33s. I can do 15mph in first and it runs 65mph at about 2500rpms. 75mph is a tad over 3k rpm. I usually drive it at 55-65 mph. Pretty happy with.
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Old 01-19-2013, 03:48 PM   #15
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For the 4.0L, 5 speed, and 33s, 4.56 is ideal. Not sure if they make gears that low for the D35 and I imagine it would be easier to break it.
Yea, D35 can only go up to 4.10 gears. 4.56 gears are too big for the housing.
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Old 01-19-2013, 03:59 PM   #16
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Yea, D35 can only go up to 4.10 gears. 4.56 gears are too big for the housing.
Yeah that's what I was thinking
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Old 01-19-2013, 05:30 PM   #17
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Yeah that's what I was thinking
They offer 4.56 for the D35 though don't they?
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Old 01-19-2013, 07:28 PM   #18
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They absolutely do make 4.56 gears for the D 35. Several manufacturers.
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Old 01-19-2013, 08:46 PM   #19
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They absolutely do make 4.56 gears for the D 35. Several manufacturers.
For all I know they might, Im not a expert. But when I got mine, I called Northridge and ordered the 4.10s and when I asked if I should go bigger they told me 4.10 is as big as the D35 housing can hold.
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Old 01-20-2013, 02:51 AM   #20
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For all I know they might, Im not a expert. But when I got mine, I called Northridge and ordered the 4.10s and when I asked if I should go bigger they told me 4.10 is as big as the D35 housing can hold.
I know my buddy has 4.56 in his D35 I don't know if it fit because of the locker or special gears to make it fit. I have heard of people running into a problem of a certain ratio not fitting though.
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Old 01-21-2013, 12:36 PM   #21
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That was bad info. He may have been referring to the carrier break, but that is at 3.54 and up on a D35. Anyway, you can run up to 4.88 in a D30/D35 combo as long as you have the right carrier. Most straight six/ax-15 guys have 3.07 gears, so a carrier replacement is needed when re-gearing (unless also going with a full locker that replaces the carrier such as detroits, arbs, zip lockers, grizzly, etc).
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Old 01-21-2013, 12:56 PM   #22
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That was bad info. He may have been referring to the carrier break, but that is at 3.54 and up on a D35. Anyway, you can run up to 4.88 in a D30/D35 combo as long as you have the right carrier. Most straight six/ax-15 guys have 3.07 gears, so a carrier replacement is needed when re-gearing (unless also going with a full locker that replaces the carrier such as detroits, arbs, zip lockers, grizzly, etc).
Thanks for that bud I'm planning one running 410s front and rear on my d35-d30. I'm putting a locker in the rear and a soft locker or limited slip in the front. I just wanted some opinions on 33's with 410 ratios
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Old 02-10-2013, 03:14 PM   #23
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I was wondering if going to 4.56 or 4.88 would be a better choice or do you thinks it would be overkill? I want to rum 33's as well but will be mostly on the interstate and around town driving. The roughest terrain my 88 YJ will see is the beach at the outerbanks. I just want to get 70-75 mph on the interstate. Any thoughts would be great...Gunny Out!!
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Old 02-10-2013, 05:52 PM   #24
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I was wondering if going to 4.56 or 4.88 would be a better choice or do you thinks it would be overkill? I want to rum 33's as well but will be mostly on the interstate and around town driving. The roughest terrain my 88 YJ will see is the beach at the outerbanks. I just want to get 70-75 mph on the interstate. Any thoughts would be great...Gunny Out!!
Depends on your motor bud I personally wouldn't run 488s on an interstate your motor will be humming pretty high. Once again depends on your motor and if you're planning on doing a lot of interstate riding id go 373 or 410 if you have the 4.0
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Old 02-11-2013, 07:30 AM   #25
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I have a 4.2 in-line six. I plan on beefing it up a bit. I also plan on doing an up-grade to the tranny. Pretty sure it's the peuago. Sorry about the spelling on that one. I want to swap it with the ax15 I think it is. This is my first Jeep so I'm not sure of a few things. I just want to try to have both a good road and beach jeep. Let me know what you think...Gunny Out!!
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Old 02-11-2013, 02:52 PM   #26
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I have a 4.2 in-line six. I plan on beefing it up a bit. I also plan on doing an up-grade to the tranny. Pretty sure it's the peuago. Sorry about the spelling on that one. I want to swap it with the ax15 I think it is. This is my first Jeep so I'm not sure of a few things. I just want to try to have both a good road and beach jeep. Let me know what you think...Gunny Out!!
This is my second jeep first one I'm actually working on. My dads jeep as with my truck runs 410s and both his and mine get decent gas mileage. That's why I believe I'm gonna run 410s seems to be a good median between road trail and interstate. Id also look up gear ratio calculator their everywhere online you punch in your tire and ratio and it'll throw you a number out for rpms at a certain speed. I like to keep mine below 3k on the interstate running 70-75 to me over 3k rpms seems a little extreme to me
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Old 03-01-2013, 08:46 PM   #27
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I have an 08 4-door wrangler and I put 295/70/18r on it and now when I'm cruising it down shifts. I think I need to gear different can somebody help please. Thanks

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