Hey, I need info on ANY type of IRS. I need to make one for a project, and need some help. Are The shafts between the joints solid on all quads? I mean there not two piece splined sections to allow plunge when the suspension moves up and down? I think any IRS would have to have a means of accomodating changing driveshaft length with suspension travel, Im assuming since the shaft between joints is solid, that this is done where they slide into the diff, just like a car transmission. I posted this in the "project quads" section, but didnt get the answers i needed.

Basically I've seen some setups (on rails) that used ag-grade U-joints, a solid shaft between joints, and a keyed shaft in the middle( where the diff is on quads). Im wondering if they are just leaving the upper u-joints loose, as in not using a set-screw so it can move in and out slightly as the suspension travels.


Hope this makes sense, Thanks in advance

 

surely someone has replaced CV joints on a quad or something that could give some input?????

 

The shaft has to able to change it's length unless the a-arm pivot points are concentric to the shaft pivot points.