If you do not now have a filter then you MUST know how the system is plumbed or you could have trouble just adding a filter.
Some gears like mine the pump output [full pressure] goes directly to the gear oil cooler and then back to the gear operating pressure side with no pressure drop. The filter WILL BE subjected to full operating pressure if installed in that circuit If that is the case you need to know or you could exploded the filter. Most spin ons are not rated for much pressure.
My gear, the oil cooler is run at 300psi and can pulse higher. Older T.D. 506 and the book says if a filter is fitted it needs a W.P. of ~ 500psi.
On the filter shown the mfgr. has designed the oil circuit so that filter is in the return so no high pressure.
On a T.D. and those gears that did not come so fitted will likely not be friendly to a spin on.
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