Rear Driveshaft 86 Comanche Question (SOA/ I6, 4.0)

[SGTJHALL]

I was wondering what MODS are needed for my project. I have a 86 comanche longbed and I'm in the process of swapping out the 2.8 V6 for the Inline 6 4.0 out of a 92 Cherokee. The comanche already has a SOA Lift done to the rear end, which I believe is about makes it about a 4.5 inch lift.

 

I have read that you have to shorten the rear driveshaft to make the swap work because the stock driveshaft is to long. Is this true with a SOA lift, and if so can I find a driveshaft of a comanche longbed that came stock with the inline 6 4.0 and would this fix the issue.

 

Or will the cherokee driveshaft work with the SOA Lift or will my stock comanche driveshaft work with the SOA Lift?

 

I appreciate any help, if nothing above will work does anyone know how I can fix this issue, its really the only thing I need to figure out to be able to get started on the swap and know for sure I can complete it without any issues. I'm trying to stay away from welding, so if I will still have to shorten the stock driveshaft is there anywhere I can by a new driveshaft specifically for such a project.

[87Warrior]

Your best bet is to get everything swapped in then measure for your driveshaft. There is a good chance you will have something that will work, but if not, you can get one lengthened or shortened by a drive line shop.

[Pete M]

we have some stock driveshaft measurements in a thread in the DIY forum. :thumbsup:

 

XJs have a foot less wheelbase than a shortbed MJ (add another 6" for a longbed) and so their rear shafts are too short to use as-is.

[kyleag89]

I'm not 100% positive but wouldn't lifting(SOA) require the drive shaft to be longer not shorter?

[87Warrior]

I'm not 100% positive but wouldn't lifting(SOA) require the drive shaft to be longer not shorter?

Typically, yes. But he is installing a longer drivetrain.

[Jeep Driver]

I was wondering what MODS are needed for my project. I have a 86 comanche longbed and I'm in the process of swapping out the 2.8 V6 for the Inline 6 4.0 out of a 92 Cherokee. The comanche already has a SOA Lift done to the rear end, which I believe is about makes it about a 4.5 inch lift.

 

I have read that you have to shorten the rear driveshaft to make the swap work because the stock driveshaft is to long. Is this true with a SOA lift, and if so can I find a driveshaft of a comanche longbed that came stock with the inline 6 4.0 and would this fix the issue.

 

Or will the cherokee driveshaft work with the SOA Lift or will my stock comanche driveshaft work with the SOA Lift?

 

I appreciate any help, if nothing above will work does anyone know how I can fix this issue, its really the only thing I need to figure out to be able to get started on the swap and know for sure I can complete it without any issues. I'm trying to stay away from welding, so if I will still have to shorten the stock driveshaft is there anywhere I can by a new driveshaft specifically for such a project.

 

 

 

If you have the large diameter tube-n-tube shaft........my drive shop refused to shorten it. I had them make up a new 3" shaft. They also would not use the shaft from a XJ as they said it was too small in diameter for a truck and there was a good chance I'd wring the shaft under load.

 

Cost me $225 and they only used my yoke......the rest was new and all Spicer parts. And what a difference.......smooth, very smooth.

[SGTJHALL]

lsmurphy

 

The info was very helpful and much appreciated. Its good to know it won't be to expensive, this issue has been holding up my build for the last 2 weeks so thank you!

 

I will let you know how things go after I get the work done!