BJ 41 Driveshaft modification after 4" lift (1 Viewer)

[Bernie123]

Hello,

I have a question with regard to the potential driveshaft modification after a 4" lift on a BJ 41.

Is it required to modify the front and/or rear driveshaft(s) after installation of a 4" lift (without front shackle reversal) and installation of longer front and rear shackles? If yes is there a value of the available driveshaft compression while the unit is sitting on level ground.

The reason behind my question is that on my unit both driveshafts have previously been modified in consequence of a gearbox/input-shaft and bellhousing modification (the gearbox was moved 2 to the front).

I have everything back to stock and have installed a 4" lift kit. Now I am wondering on the required or mandatory compression I should allow in both driveshaft.

Thank you for your help.

Bernie

 

[CruisinGA]

you might not need to modify the driveshafts again. Pictures of the driveshafts installed showing the slip yoke would be helpful

 

[Bernie123]

Hello Sir,

thank you for the interest.

I have attached pictures of the front and rear driveshaft, with the unit with the wheels on level ground, plus the measurements of the splines and shaft ends uninstalled.

My current theory is that the spline should be completely in the other end of the slip yoke so that I would have 1-1/2" of possible "compression" in the rear and 1" of compression in the front before the slip yoke would bind.

Thanks Bernie

 

[Bernie123]

I have given the issue a bit more thought and we came up with the attached diagram.

Any comments.

Regards Bernie