Originally Posted by
Urban Panzer
You should also consider the front cross member as well because some shocks depending on the "drop" they have will allow the front prop to contact the crossmember.
My Terrafirma shocks allow my OME front springs to just come of the seats and the prop to hit the crossmember, hence it's spaced down 15mm, there is always a trade off when modding something.
Also, if fitting spacers under the rear airbags, It's advisable to fit +2" longer bumpstops to stop the bag being potentially damaged when the axle is fully stuffed up into the arch.