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Old 03-07-2014, 09:47 AM   #1
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TJ Regearing questions / advice

Ok, seems like the tome has come to address the regear

I have a 05 TJ, 4L with the 6sp gearbox and 3.07 gears, D30 front, D44 back

At the moment I have 31" tyres, but 33" is planned as part of the regear

My Jeep sees a lot of motorway but equally a good bit of offroad, and with the current setup its lacking bigtime in power, especially offroad

I had a look at the regear charts, it does seems like 4.10 or 4.56 will work.

Question then, as all these charts are based on the 5sp TJs (could not find one for a 6sp), how does the 2 different setups behave with the 6sp??

I understand that I would need to add carriers, am I correct, and what gears (make) are good, what to avoid ??

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Old 03-07-2014, 10:09 AM   #2
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4.56 is optimal for the 6spd manual tranny for 33s
The D30 will take up to a 4.88 gear, not sure about the 44
Any quality name brand will be good for gears, DO NOT cheap out.

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Old 03-07-2014, 10:19 AM   #3
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Definitely go 4.56, that is the optimal ratio for 33" tires. The charts don't care if you have a 5-speed or 6-speed, the rpms such chart indicate are when the transmission is in it gear that gives the 1:1 drive ratio which would be 4th gear with the 5-speed transmission or 5th gear with your 6-speed. The rpms will actually be considerably lower when you shift into your 6th gear.

Brand-wise, you can't beat Spicer. Dana-Spicer is who made your axles and they of course use Dana-Spicer gears.
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Old 03-07-2014, 10:43 AM   #4
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Interesting re the charts, didn't realise its on s 1:1 ratio

I looked at Motive Gears and YuKon Gears

Thoughts??
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Old 03-07-2014, 10:46 AM   #5
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Interesting re the charts, didn't realise its on s 1:1 ratio
Few do. Such charts have misled many Jeepers into undergearing their Jeeps.
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Old 03-07-2014, 10:48 AM   #6
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I have heard of high powered diesel pickups using Yukon Gears without issues. If they hold up with those vehicles they should handle a jeep without issue.
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Old 03-07-2014, 10:51 AM   #7
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I would not buy ANY gears or master install kits with the intention of saving a few bucks and giving the parts to a shop to install. Have the installing shop provide ALL of the parts so they can't blame your parts when/if something goes wrong during or after the installation. They will only warranty what they provide for you.
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Old 03-07-2014, 10:54 AM   #8
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Almost all gears are manufactured by the same company. Just packaged differently.
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Old 03-07-2014, 11:00 AM   #9
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Quote:
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I would not buy ANY gears or master install kits with the intention of saving a few bucks and giving the parts to a shop to install. Have the installing shop provide ALL of the parts so they can't blame your parts when/if something goes wrong during or after the installation. They will only warranty what they provide for you.
I agree it is in poor taste to take parts to a shop and ask them to install.

Some shops don't care others do. Best not to take money out of the pocket of the guy you are trusting to do your work.

Or you could grab some pizza and beer and ask someone to show you how to do it yourself.

Many drag racers or people in the racing industry know how and are willing to help show a new guy. That's how I learned.
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Old 03-07-2014, 01:34 PM   #10
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I agree it is in poor taste to take parts to a shop and ask them to install. Some shops don't care others do. Best not to take money out of the pocket of the guy you are trusting to do your work. Or you could grab some pizza and beer and ask someone to show you how to do it yourself. Many drag racers or people in the racing industry know how and are willing to help show a new guy. That's how I learned.
What kind of racing are you doing with your jeep? Lol
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Old 03-10-2014, 05:14 PM   #11
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So, as per advise bought myself a set of front and back ring and pinion gears, 4.56!!

Need to get stuck in to get this installed, so do need a hand on advise
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Old 03-12-2014, 04:53 PM   #12
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Whilst planning my regearing, I'm looking at maybe getting lockers, well price dependent..

I came across a few posts where the guys got loads of good things to say about Aussie lockers.. Had a look and was surprised at their cost.. So thinking of installing it in the back only

What's the thoughts on these and my idea..??
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Old 03-12-2014, 05:21 PM   #13
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First, don't install any locker into your rear axle if it is a Dana 35, which simply isn't strong enough for a locker. Even if your rear axle is a Dana, 44 I would not install a lunchbox style locker like the Aussie. Generally speaking, rear mounted lunchbox lockers like the Aussie are just not well behaved enough for most people, especially in daily drivers. They are fine in the front when you're in 2wd, just not when you need to be in 4x4 on an ice or snow covered road when they will cause steering issues.
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Old 03-12-2014, 06:22 PM   #14
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First, don't install any locker into your rear axle if it is a Dana 35, which simply isn't strong enough for a locker. Even if your rear axle is a Dana, 44 I would not install a lunchbox style locker like the Aussie. Generally speaking, rear mounted lunchbox lockers like the Aussie are just not well behaved enough for most people, especially in daily drivers. They are fine in the front when you're in 2wd, just not when you need to be in 4x4 on an ice or snow covered road when they will cause steering issues.
I've got a D44 in the back

Its the fine line for me, how much do I want to spend on lockers, if I go down that route vs how many offroad miles the Jeep see

ARB is very tempting, but well expensive
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Old 04-14-2014, 05:06 PM   #15
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Ok, lets see what you guys think

To recap, got a '05 TJ, 4.0, 6sp manual with 3.07 gears and 31" at the moment, but changing to 33" soon

At the moment I can only use upto 5th, with 33" its gonna be dead

So regear, people do say go for 4.56, but as I have the 6sp, gear ratios is a bit different

Have a look at the comparison, 4.1 with a 6sp is on par with 4.56 with a 5sp

Am I better of with 4.1 then.. Anyone out there with a few wise words here
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Old 04-14-2014, 05:08 PM   #16
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Forgot to mention, here's the link I use to come up with the comparisons.

http://www.grimmjeeper.com/gears.html
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Old 04-14-2014, 05:49 PM   #17
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My rule of thumb is this: If its under the jeep, don't go cheep! You won't see Rusty's or Rugged Ridge under there.
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Old 04-14-2014, 06:58 PM   #18
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Well while I am no fan of the over priced underperforming German 6 speed it has a couple features that might be considered as reasons for slightly numerically lower axle ratios then either 5 SPd with the same size tires

It has a lower 1st gear almost a granny first and as o recall despite more gears its one overdrive ratio 6th is actually less overdrive than either 5 SPd

So if one was doing significant on road use and wanted to run 33 inch tires and never planned to go any bigger on tires a 4.10/4.11 set of gears might be as well liked as a 4.55/4.56 set of gears

If you ever plan to go larger tires or upgrade to one of the less expensive more robust TJ 5spd trannys I would go for the 4.55/4.56 but if sticking with the kraut gearbox and only 33 you might be very happy with 4.11. The other upside of 4.11 is there are actual stock tj and i think explorer axles out there that came with that ratio
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Old 04-14-2014, 07:02 PM   #19
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What is most of your driving consisting of?
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Old 04-14-2014, 10:47 PM   #20
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Don't forget that you'll need new carriers too.
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Old 04-15-2014, 01:51 AM   #21
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Thx for the replies guys

As I prefer manual over auto, the only manual option for a '05-'06 was the 6sp, and to be honest, I have no problem with it what so ever

I'll go to a max of 33" tires, no desire to go any bigger, and I'm limit to my garage door, as I will just squeeze in with an inch to spare..

Majority of my driving is on the road, do tent to go for gentle offroading every other month, done a few more intense ones and the Jeep was really lacking power, even in Low range!!

Re carriers, I'm still in 2 minds re lockers, as much as I want ARB, not sure I can justify the cost vs the amount and type of offroad
Ing Im doing, but for gears, Yukon!!!

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