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Front diff swap?


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Hey all I just registered today. So! Next week I plan on buying a lifted kj 2006 limited with 31 ...

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Old 11-14-2017, 02:21 PM   #1 (permalink)
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Default Front diff swap?

Hey all I just registered today. So! Next week I plan on buying a lifted kj 2006 limited with 31 inch tires. Only issue is that it needs to be regeared. I really wanna do 4.10 but every thread I've seen on here kind of beats around the bush getting to the answer. I can find the 4.10 for the rear but from what I've read that won't fit in the dana 30a for the front. So I guess what are my options? Can I just swap a front differential from a 2.5 with the 4.10 already in it? Or is there more to it then that. I'm on a budget so I'm looking for the cheapest most reliable way to do this. It would be my daily but still something I'd take off road and from what I've read that gearing would be preferable. I know 13 mpg isn't horrible but I'd like to see better being as I will use it for road trips in the winter. So what are my options?!
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Old 11-14-2017, 02:24 PM   #2 (permalink)
 
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You can get the correct 4.10's still for the front,only Dana/Spicer(OEM sets).

And yes you can direct swap in a front diff from a 2.4 gas KJ with 4.10's already installed.
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Old 11-14-2017, 02:46 PM   #3 (permalink)
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Originally Posted by Axel-ander92 View Post
Hey all I just registered today. So! Next week I plan on buying a lifted kj 2006 limited with 31 inch tires. Only issue is that it needs to be regeared. I really wanna do 4.10 but every thread I've seen on here kind of beats around the bush getting to the answer. I can find the 4.10 for the rear but from what I've read that won't fit in the dana 30a for the front. So I guess what are my options? Can I just swap a front differential from a 2.5 with the 4.10 already in it? Or is there more to it then that. I'm on a budget so I'm looking for the cheapest most reliable way to do this. It would be my daily but still something I'd take off road and from what I've read that gearing would be preferable. I know 13 mpg isn't horrible but I'd like to see better being as I will use it for road trips in the winter. So what are my options?!
Like tjkj has already mentioned one fro a 4 cylinder gasser will work, direct bolt in have done it a few times here at my place.
Not sure about beating around the bush, been mentioned/ talked about/ described many times on here in the past .
Also like he mentioned gearsets are still available .
JBA still has them listed and can buy from them.
Next thing is ...what lift is on it, hopefully a full spring lift like OME or JBA coilover, if not pass on it
Oh and 13 is horrible if thats on road MPG with only 31s
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Old 11-14-2017, 03:56 PM   #4 (permalink)
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To source a used front differential use car-part.com
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Old 11-14-2017, 06:23 PM   #5 (permalink)
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Originally Posted by tommudd View Post
Like tjkj has already mentioned one fro a 4 cylinder gasser will work, direct bolt in have done it a few times here at my place.
Not sure about beating around the bush, been mentioned/ talked about/ described many times on here in the past .
Also like he mentioned gearsets are still available .
JBA still has them listed and can buy from them.
Next thing is ...what lift is on it, hopefully a full spring lift like OME or JBA coilover, if not pass on it
Oh and 13 is horrible if thats on road MPG with only 31s
Yeah its just got a spacer lift but that'll go bye-bye and ill do it right. And yeah its actually closer to like 14.5 15 mpg in city. But still id like to regear before I switch to larger tires and lift too
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Old 11-14-2017, 06:29 PM   #6 (permalink)
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Originally Posted by tjkj2002 View Post
You can get the correct 4.10's still for the front,only Dana/Spicer(OEM sets).

And yes you can direct swap in a front diff from a 2.4 gas KJ with 4.10's already installed.
What year 2.4 would you recommend? We have quite a few junkyard here and around these parts kjs aren't missed much so I could probably score a low mileage whole 2.4 depending on year and just use the front and rear both
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Old 11-14-2017, 06:33 PM   #7 (permalink)
 
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Any of them would be fine. Go for the one with lower miles.
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Old 11-14-2017, 06:36 PM   #8 (permalink)
 
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Originally Posted by Axel-ander92 View Post
What year 2.4 would you recommend? We have quite a few junkyard here and around these parts kjs aren't missed much so I could probably score a low mileage whole 2.4 depending on year and just use the front and rear both
If your SOL for the rear for having a '06.The 2.4 gas KJ's only are 2002-2005 model years and in 2006 they changed the rear 8.25 for 4 channel ABS so a '02-'05 rear diff will not work if you want your ABS to work.

And no just switching the backing plates and axles will not work since the axles themselves are different between '02/'05 and '06/'07 and can not be interchanged.
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Old 11-14-2017, 06:46 PM   #9 (permalink)
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Originally Posted by tjkj2002 View Post
If your SOL for the rear for having a '06.The 2.4 gas KJ's only are 2002-2005 model years and in 2006 they changed the rear 8.25 for 4 channel ABS so a '02-'05 rear diff will not work if you want your ABS to work.

And no just switching the backing plates and axles will not work since the axles themselves are different between '02/'05 and '06/'07 and can not be interchanged.
Ok good to know!
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Old 11-14-2017, 06:46 PM   #10 (permalink)
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Originally Posted by HoosierJeeper View Post
Any of them would be fine. Go for the one with lower miles.
Awesome thanks all for the good info!
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