Swap 27 spline for 29 spline?

If I have a 27 spline 8.25, can I swap in 29 spline shafts?? If so, what else do I need to replace? Thanks.

I believe all you will need are the differential side gears.

You will need a 29 spline carrier, side gears, and shafts. Although you will not have to do a complete diff set up(the pinion depth should be OK) you will need to set the backlash to spec. The rear will most likely be a little noisy until the gears wear in. If you decide to go to a lower ratio then a complete set up of the rear would have to be done.

In my opinion I would just get a 29 spline rear out of junker.

Pics to prove my point.

This pic shows the difference in diameter of the axle shafts, a little makes a big difference!




This pic shows the difference between the side gears and why you need to swap carriers as well. The side gears on the 29 spline need a larger "hole" in the carrier in order to fit.


This pic once again shows the difference in diameters of the shafts.

Thanks for the great info. My idea was to just get the complete axle, swap the gears for 4.56, add a locker, and some aftermarket 29 spline shafts.