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Unread 01-02-2014, 03:36 AM   #1
TEXANS91
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1991 FSJ Wagoneer 
 
Join Date: Jan 2014
Location: Chugiak, AK
Posts: 2
Axle Swap???

I've got an interest in swapping out my original 1/2 ton axles on my 1991 Grand Wagoneer for a set of 3/4 ton J20 axles. Not being a gear head; I wasn't sure of the validity of the idea. I definitely want the lower gear ratio, higher towing capacity, and the increased strength; but I haven't found any related topics on the forums. Should I take the J20 transfer case as well? Don't know if its any better than my stock tcase. Any ideas/concerns/tips? Thanks.

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Unread 01-02-2014, 10:34 AM   #2
CSP
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Join Date: Aug 2002
Location: Colorado
Posts: 12,573
What's the need for the increased strength? It's minimal as both axles use the same size axleshaft.

Towing capacity won't go up at all as your springs aren't going to gain anything from an axle swap.

Transfer cases would be the same for the most part, within any given year.
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Unread 01-02-2014, 11:58 AM   #3
olliehopnoodle
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1982 FSJ Cherokee 
 
Join Date: Sep 2012
Location: mesa, az
Posts: 1,064
What year j20?
And by the way, the axles are wider and the spring purchases on the rear will be in the wrong place.
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Unread 01-04-2014, 04:44 PM   #4
TEXANS91
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1991 FSJ Wagoneer 
 
Join Date: Jan 2014
Location: Chugiak, AK
Posts: 2
I want the gearing to be lowered, hence the dana 60 rear end vs my 44 pumpkin...and surely the 60 is stronger and can handle more weight than the 44. I'm running 33'' tires, my spedo is about 4 miles off and my mileage is a bit worse than it used to be. I've new springs and will install better adjustable shocks and or air bags for the rear end. There's always a mountain or two to climb where ever I pull my boat; as well as my atvs. I know the J20 axles are wider, and all that goes along with that: new perches, bases for the springs, pumpkin offset locations, lug pattern; all of that I will change out accordingly. I was looking at a '79 model; which was not what I hoping for. I'd rather stick to an '88; or as late of a model as I can. Now, I was talking to the man with the '79 model and he said his tcase/axle configuration was full time 4x4 and was not limited slip; if I remember correctly. That fact in and of itself lures me right in. The original inquiry I had was for any feed back from anyone having experience in swapping the axles out that could advise me one way or the other with regards to their lessons learned. Thanks for any input.
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Unread 01-04-2014, 05:43 PM   #5
CSP
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Join Date: Aug 2002
Location: Colorado
Posts: 12,573
The '79 tcase won't bolt to your transmission.
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axle swap , J20 , wagoneer

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