KJ with 4.56 gears

radame · **Posted:** Tue Aug 21, 2007 10:14 pm

Does anybody have tried this configuration for your gears??
I'm thinking on this config:

US gears 4.56 (front, rear of course)
Rear Powertrax no-slip for Trac-Loc
Front Detroit TrueTrac

Do you know if there are some limitation to install the rear locker/front LSD with that set of gears?
Is there some risk to damage something?

Thanks for any comment on this

Rock Lizard · **Posted:** Tue Aug 21, 2007 10:22 pm

4:10 gears are the highest you can go in the D30A. Sorry.

tjkj2002 · **Posted:** Tue Aug 21, 2007 10:27 pm

Yep the lowest gears you can put in KJ are 4.10's,the front Dana30A gear sets have a longer pinion then regular Dana30's so those gear sets will not work.

radame · **Posted:** Tue Aug 21, 2007 10:40 pm

Ok
Then I don't understand why RRO sell those 4.56 the KJ?!?!

With this 4.10 do you think I can have problems with the True Trac in the front or there is no problem with that :?:

Thanks a lot for the info guys!!!!

Rock Lizard · **Posted:** Tue Aug 21, 2007 10:43 pm

radame wrote:

Then I don't understand why RRO sell those 4.56 the KJ?!?!

There's the problem right there. Hopefully that helps clear things up. :wink:

myjeepwalks · **Posted:** Tue Aug 21, 2007 10:46 pm

Rock Lizard wrote:

radame wrote:

Then I don't understand why RRO sell those 4.56 the KJ?!?!

There's the problem right there. Hopefully that helps clear things up. :wink:

tommudd · **Posted:** Tue Aug 21, 2007 10:47 pm

Yes RRO = problems for sure! :wink:

If they said the sun will come up tomorrow I would need to go out and check for myself.

KY Liberty · **Joined:** Sat Jul 09, 2005 1:46 pm **Posts:** 1195

They don't have any gears at all that fit the front of the KJ. Had my front end torn apart for 3 weeks while they kept sending me different sets. They not only stopped claiming to have someone with a KJ and 4.10 gears that worked there, but stopped claiming to have anyone who even owned a KJ through the course of my discussions with them. We put in the front diff from a low milage 4 cyl to get the 4.10's in mine. They have known for years that the gears they sell for the front don't fit.

Dje Ryu · **Posted:** Tue Aug 21, 2007 11:07 pm

tommudd wrote:

Yes RRO = problems for sure! :wink:

If they said the sun will come up tomorrow I would need to go out and check for myself.

If they said that, I'd be in Vegas making bets that it wouldn't rise!

spoonplugger1 · **Posted:** Wed Aug 22, 2007 12:26 pm

I guess the RRO website isn't our favorite then? LOL. I notice they don't mention any gear changes to their shop Liberty.

wildrussian · **Posted:** Wed Aug 22, 2007 12:31 pm

What are the factory gears that come on Liberty?
If I have bigger tires do I have to increase the ratio or dercrease the ratio?

tjkj2002 · **Posted:** Wed Aug 22, 2007 12:35 pm

wildrussian wrote:

What are the factory gears that come on Liberty?
If I have bigger tires do I have to increase the ratio or dercrease the ratio?

Most KJ's come with 3.73 gears,the 4-cylinder gassers came with 4.10's,and some of the newer 6 speed KJ's have 3.55's.You don't have to change gears but you will notice a drop in performance and mpg's.When going to bigger tires(heavier) you want to go to a lower gear(higher #),4.10's are a lower gear then 3.73's,to get back into the correct power range of the engine.

When I do my SFA swap I'm going to 5.13 gears,a little lower then I should(4.88's would be perfect) but it will help out with the mpg's around town,just won't be able to go as fast on the highway.

Gris · **Posted:** Wed Aug 22, 2007 2:47 pm

Reider Racing can get teh 4.10s for the front direct from Dana. Same as the dealer gears that come in the 4cyl, but a whole lot cheaper.

www.reiderracing.com

You have to call them. I got mine from them and have no problems at all.

tommudd · **Posted:** Wed Aug 22, 2007 3:07 pm

tjkj seems about right with going to 5.13s a lot of the guys over on ROF seem to like them with the size tires you are going with should be about right I would say!

KY Liberty · **Joined:** Sat Jul 09, 2005 1:46 pm **Posts:** 1195

I really like being geared a little lower. The 4.10's with my 29.5" 245/65R17's works out great. With the other modifications, I have huge power up to about 90 mph, and top out 3rd around 130 mph. It tows a few thousand pound enclosed trailer bigger than it through KY hills with no problems.

A little advice for making the Libby a lot more fun to drive...

Lower the gearing, upgrade the torque converter, put in a shift kit, flash the computer and delete the torque management, upgrade the throttle body, put in a good drop in air filter, and replace your muffler. Change the plugs, clean the injectors, and change all your fluids with good synthetic. You will have spent some money, but everyone will think you've got a 4.7 under the hood.

jorgewolf · **Joined:** Fri Aug 31, 2007 5:01 pm **Posts:** 5

Some body know where I can get 4.10 Gears for my front Axle DANA 30A?

Is easy if I want a get gears 4.10 for DANA 30 But not for DANA 30A

Jorgewolf

tommudd · **Posted:** Mon Nov 19, 2007 10:11 pm

Read previous posts ........... reiderracing.com

KJ with 4.56 gears

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