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Old 11-01-2010, 07:54 PM   #1
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tire size matched with gears?

I am wanting to go to 33's on my 04 TJ sahara. I saw in a post earlier that someone recommended a 4.10-4.88 depending on transmission and offroad application, but i can't find it. I have the stock 4.0, auto trans, and transfer case. Should I stay more on the 4.10 side or lean more towards the 4.88? I was considering 4.26 but saw Randy's didn't carry it for the D35.

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Old 11-01-2010, 07:57 PM   #2
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With the auto I want to say 4.10's but can't recall. Also are you planning to upgrade shafts on the dana 35?

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Old 11-01-2010, 10:04 PM   #3
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Eventually will upgrade shafts, it all comes down to when I have the $!
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Old 11-02-2010, 07:39 PM   #4
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Quote:
Originally Posted by gooseofdeuce View Post
Eventually will upgrade shafts, it all comes down to when I have the $!
4.88 for sure you'll get nice power out of em, but you are going to want to upgrade the shaft or upgrade the axle all together ideally

4.10s work as well personally i would go for 4.88
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Old 11-02-2010, 08:42 PM   #5
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Funny, i was going to ask a similar question.... I'm running 35's on 4.56's on a Ford 8.8

Don't mean to thread jack, but my speedo is 15mph off (reads too fast) and I need to know what tranny cable to run...
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Old 11-02-2010, 08:48 PM   #6
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Funny, i was going to ask a similar question.... I'm running 35's on 4.56's on a Ford 8.8

Don't mean to thread jack, but my speedo is 15mph off (reads too fast) and I need to know what tranny cable to run...
In a YJ you need to swap out a new speedo gear check em out here:

Jeep Speedometer Gears at Morris 4x4 Center
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Old 11-02-2010, 08:58 PM   #7
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Why isn't '87-90 on there???
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Old 11-02-2010, 09:04 PM   #8
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not sure seems the hardware is different from 90 to 91. Maybe you can get away with 91 hardware, im not sure about that though maybe someone else knows whats up there
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Old 11-02-2010, 09:10 PM   #9
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Well
I have a TF999 so that's the variable
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Old 11-04-2010, 04:57 AM   #10
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dont mind

Quote:
Originally Posted by beefmobile View Post
Funny, i was going to ask a similar question.... I'm running 35's on 4.56's on a Ford 8.8

Don't mean to thread jack, but my speedo is 15mph off (reads too fast) and I need to know what tranny cable to run...
Ehhhh, its ok. This was also on my mind but figured I would use GPS as actual speed speed-o.
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Old 11-04-2010, 03:37 PM   #11
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I've been searching for companies and have found Precision Gear and Motive gear. Partially because they are the few that offer in a 4.27 gear set, Motive for Dana 30 and Precision for dana 44. For some reason Precision doesn't offer 4.27 in dana 30. Since i'm building a daily driver weekend warrior rig I want something that will give me decent highway manners but also a good crawl. What's the opinion of the more experienced builders?
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Old 11-04-2010, 06:01 PM   #12
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This is a good chart to use for general reference. Hit view full size to see better.

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Old 11-05-2010, 11:50 AM   #13
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I've had good luck with 4.56s but they did sorta blow up after about 10 yrs. Speedo only off by 5mph even after I changed out the sprocket underneath. Dont know if my shafts are worn out yet, though they could be the cause of my DW IDK. I'm running 33s
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Old 11-05-2010, 12:38 PM   #14
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with a 2004 automatic (42RLE) you want 4.88s with 33s. no question, 4.88s at the very least.
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Old 11-05-2010, 10:42 PM   #15
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so why 4.88's for a daily driver? I wouldn't hesitate if it was just a weekend toy.
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Old 11-06-2010, 08:49 AM   #16
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Quote:
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so why 4.88's for a daily driver? I wouldn't hesitate if it was just a weekend toy.
42RLE is undergeared from the factory. its got an OD ratio of 0.69:1. The 42RLE BONE STOCK actually turns the same RPMs with 3.73s/30s as the NV3550 manual does with 3.73s/35s.

The 42RLE should have come with 4.56s in a Rubicon. 4.88's & 33s actually puts you running less RPM's @ 70mph than a bone stock Rubicon 6-speed.

Do the math. For you manual shifting guys, run 3.73s, 35s and don't use 1st gear (or 4th for the 6-speed). Thats the bone stock 42RLE.

Trust me on this one. I know wtf i'm talking about. I'm running 4.88s and 33s on a 42RLE DD right now. With the 42RLE's stupid tall OD, mileage isn't an issue. I get 18-20mpg if i can keep my foot out of it.
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Old 11-06-2010, 07:27 PM   #17
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Unlimitedlj04, I preciate it. I like hearing from guys that are actually running the set up I plan too.

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