What are our front and rear differentials?

toy4everyseason · **Posted:** Mon Oct 29, 2007 9:10 pm

What are our front and rear differentials? (i.e. dana 40...) I was trying to look it up on Jeep's website but I think my firewall at work blocks it.

carroll952 · **Posted:** Mon Oct 29, 2007 9:19 pm

toy4everyseason wrote:

What are our front and rear differentials? (i.e. dana 40...) I was trying to look it up on Jeep's website but I think my firewall at work blocks it.

Front is a Dana 30a and the rear is a Chrysler 8.25.

toy4everyseason · **Posted:** Mon Oct 29, 2007 9:23 pm

thanks!

so I might want to be careful with landing a tire hard while spinning huh?

tjkj2002 · **Posted:** Mon Oct 29, 2007 9:26 pm

toy4everyseason wrote:

thanks!

so I might want to be careful with landing a tire hard while spinning huh?

You KK owners get it lucky,the D30A's in the KK's have extra reinforcment in the pinion area for added strength.Notice the extra mount under the pinion area,there's alot more material there to help prevent the pinion and ring gear "walking" over each other a cracking the diff housing.As seen in this pic Diggerfreak posted,the KJ's D30A doesn't have that extra front mount and added material.

toy4everyseason · **Posted:** Mon Oct 29, 2007 9:33 pm

yea!!! let the fun continue

thanks tjkj2002, on a different topic does rock lizard have any cool plans for the KK?

corwyyn · **Posted:** Tue Oct 30, 2007 3:04 am

OK, so does anyone know why they switched the design on the front driveshaft to a u-joint type instead of the CV type on the KJs?

Rock Lizard · **Posted:** Tue Oct 30, 2007 3:33 am

toy4everyseason wrote:

thanks tjkj2002, on a different topic does rock lizard have any cool plans for the KK?

Same products as the KJ. :wink:

toy4everyseason · **Posted:** Tue Oct 30, 2007 7:20 pm

corwyyn wrote:

OK, so does anyone know why they switched the design on the front driveshaft to a u-joint type instead of the CV type on the KJs?

they did? looks like CVs on the ends to me

corwyyn · **Posted:** Tue Oct 30, 2007 10:52 pm

Well, looking at this picture that Diggerfreek took it sure looks like u-joints to me:

Diggerfreek · **Posted:** Tue Oct 30, 2007 11:08 pm

ill get a close up tomorrow

JPaul · **Posted:** Fri Nov 02, 2007 5:52 pm

so, if they reinforced the pinion area on the D30A for the KK, can the housing be swapped over into a KJ? It would be a good replacement if I ever do bust the front diff.

toy4everyseason · **Posted:** Fri Nov 02, 2007 6:30 pm

corwyyn wrote:

Well, looking at this picture that Diggerfreek took it sure looks like u-joints to me:

Sorry I was thinking you were talking about the half shafts that go from the diff to the wheels. KJs have a CV joint in the driveshaft between the transfer case and front diff? As a novice off roader that doesn't seem like a good idea to me.

tjkj2002 · **Posted:** Fri Nov 02, 2007 7:15 pm

JPaul wrote:

so, if they reinforced the pinion area on the D30A for the KK, can the housing be swapped over into a KJ? It would be a good replacement if I ever do bust the front diff.

I don't think it would fit since they redid the cradle to except the different diff,if you also notice in the 2 pics in this thread that the extra reinforcement is also a mount also which would not clear in the KJ's cradle.

Quote:

Sorry I was thinking you were talking about the half shafts that go from the diff to the wheels. KJs have a CV joint in the driveshaft between the transfer case and front diff? As a novice off roader that doesn't seem like a good idea to me.

Cv joints can be as strong if not stronger then u-joints,the problem lies in when the CV's get at extreme angles that tend to break them.The fact that the front diff is bolted in place and does not move you can control the angles of the joints so the CV ends on the KJ's is as strong as the KK's u-joints,the problem arises from the inability to grease the joints that leads to failure.

JPaul · **Posted:** Fri Nov 02, 2007 9:58 pm

I thought the whole frame was redone with the new model and that's why it has a new cradle. Am I wrong on that?

kj in a tight spot · **Posted:** Sat Nov 03, 2007 1:48 am

JPaul wrote:

I thought the whole frame was redone with the new model and that's why it has a new cradle. Am I wrong on that?

Yup the whole frame was redone on the new KKs...

_UnLiMiTeD_ · **Posted:** Sat Nov 03, 2007 2:12 am

based off the nitro is it not

kj in a tight spot · **Posted:** Sat Nov 03, 2007 2:29 am

_UnLiMiTeD_ wrote:

based off the nitro is it not

Not that Im aware of but I keep gettin comflictin views on it...some over on JU have been chirpin that the Patriot is based of the Nitro...dont look like a Nitro I think the KK looks more like it to me but who knows...

Diggerfreek · **Posted:** Sat Nov 03, 2007 7:09 pm

that is what i heard to... I also heard the nitro is based off of the liberty and they released the nitro earlier to fill the gap in dodges line up and to see how will it sold

rickm · **Posted:** Sun Nov 04, 2007 1:51 am

I was reading a trade magazine recently that said the exact same thing.

They were saying that DC was a year or two behind on updating the Liberty because they were busy designing and producing the Compass and Patriot, but they already had the new KK platform designed.

They said that they put the Nitro on the upgraded Liberty platform. When they got around to updating the Liberty this year, they used the platform that they had designed for it earlier.

C co Crusader 2/127 · **Posted:** Thu Nov 15, 2007 2:07 pm

tjkj2002 wrote:

JPaul wrote:

so, if they reinforced the pinion area on the D30A for the KK, can the housing be swapped over into a KJ? It would be a good replacement if I ever do bust the front diff.

I don't think it would fit since they redid the cradle to except the different diff,if you also notice in the 2 pics in this thread that the extra reinforcement is also a mount also which would not clear in the KJ's cradle.

Quote:

Sorry I was thinking you were talking about the half shafts that go from the diff to the wheels. KJs have a CV joint in the driveshaft between the transfer case and front diff? As a novice off roader that doesn't seem like a good idea to me.

Cv joints can be as strong if not stronger then u-joints,the problem lies in when the CV's get at extreme angles that tend to break them.The fact that the front diff is bolted in place and does not move you can control the angles of the joints so the CV ends on the KJ's is as strong as the KK's u-joints,the problem arises from the inability to grease the joints that leads to failure.

well how about just cutting the mount off? from what i see in the picture it looks like it would be easy to just cut the stud off. An i know al had a cradle drop planned for the big 6. Wouldn't that gove a bit more room for the kk axel?

What are our front and rear differentials?

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