Regearing

[ktmrider]

So now that my lift is installed even with 255/70-16's I can see there needs to be a set of 4.10's installed. I have a lot of experience with the rear 8.25 but none with the aluminum front Dana 30. Just how fragile is it and will it accept any lockers? I have a Dana 30 Eaton Truetrac LS I would like to use. I understand the KK uses regular Dana 30 parts but is still an aluminum case. Is it an option as a swap? I see the JBA steel diff case, but I'm thinking for my application it might be overkill.

 

[cplchris]

unless you spend a lot of time on the skinny pedal with one or more of the front tires in the air, then the JBA steel diff is not for you, unless you plan on lifting higher and running 32 or 33" tires, then the cost would be worth the ability to have 4.56 gears.

I haven't looked into lockers for it, but IIRC I think there is an air locker that works but requires a different diff cover and drilling the housing for the breather tube, (stock breather tube is located on the cover).

 

[tommudd]

Front D30a, ARB or DTT are best bets
JBA front diff is a nice addition but not needed as mentioned unless you like to hammer down then other parts will fly anyways

 

[ktmrider]

Front D30a, ARB or DTT are best bets
JBA front diff is a nice addition but not needed as mentioned unless you like to hammer down then other parts will fly anyways

Yea the DTT is not going to take big tires and abuse anyway..but it will fit inside the stock housing? I'm not going over 265/70's at the most or the 2.5 lift so sounds like the stock diff will work. What parts from a regular D30 will not work on the KJ's?

 

[John3seventeen]

Yea the DTT is not going to take big tires and abuse anyway..but it will fit inside the stock housing? I'm not going over 265/70's at the most or the 2.5 lift so sounds like the stock diff will work. What parts from a regular D30 will not work on the KJ's?

DTT fits in the stock diff just fine

 

[tommudd]

Yea the DTT is not going to take big tires and abuse anyway..but it will fit inside the stock housing? I'm not going over 265/70's at the most or the 2.5 lift so sounds like the stock diff will work. What parts from a regular D30 will not work on the KJ's?

Troy ( TJKJ) ran one in his for a long time and wheeled the heck out of it , never had any issues . Not sure what you mean that a DTT is not going to take big tires ?? He was running 32s at the time

 

[ktmrider]

I have seen some that cracked the case..but I am talking about guys that can break steel balls with rubber hammers. But I'm sold stock case with the DTT I already have and 4.10's. Not sure what I am going to put in the rear but leaning toward an ARB. I have an auto locker in my XJ and I hate it on road. I want to be able to have an open diff in the rear. Is the the KJ 8.25 a 29 spline?

 

[tommudd]

I have seen some that cracked the case..but I am talking about guys that can break steel balls with rubber hammers. But I'm sold stock case with the DTT I already have and 4.10's. Not sure what I am going to put in the rear but leaning toward an ARB. I have an auto locker in my XJ and I hate it on road. I want to be able to have an open diff in the rear. Is the the KJ 8.25 a 29 spline?

Yes 29 spline , cracking the case is not that hard if you are not careful, BUT in all of the years a lot of us have been on here a locked front never blew / broke
I've got a buddy that used to have a pile of 9s/44s/60s out behind the shop that he went through like gas through a cats a** . So yes you can tear anything up

 

[ktmrider]

Is the CRD front diff the same as the gas?

 

[tommudd]

Is the CRD front diff the same as the gas?

Same diff
different gears
different brackets

 

[u2slow]

I put a Powertrax in.... no gear setup required. :gr_grin: