Well, you'll want to allow it to shorten as the springs compress, so you don't want it too tight in the resting position. How long it needs to go depends on your suspension set up - if you have springs and bushes that allow the axles to droop very low then you'll want something on which the spline will stay engaged at maximum suspension travel. Most wide angle props are designed to accommodate this sort of thing. You want something that will squash up an inch or two shorter than the distance between the drive flanges when the vehicle is at rest, otherwise when the springs compress it will put a lot of pressure on the bearings in the diff and transfer case.
Paulmitchell1984
Well-Known Member
iv wondered this as iv got wide angle props on but seemed to show quite alot of the splines, bought some 15mm spacers but now worried if its going to compress too much, is there any way to check this?
Iv got the RAC twist kit on with 15" travel at the rear and 12 up front
Iv got the RAC twist kit on with 15" travel at the rear and 12 up front
I've always just used the rule of thumb that if there's an inch or two of movement left before the splined section bottoms you'll be alright. It seems to have worked on various vehicles. You could work it out a bit more formally from the geometry, or for a practical test, pop the springs out and raise the axle so it's touching the bump stops and see if you've got a margin of movement on the prop.
