I put one on my truck when it was new in the fall of 96 & it works fine. (182k now) The spin on filters down to 10 micron, and flows 20gpm. The filter in the transmission only filters 40-50 micron. Mine came from Tractor Supply, it's a Cross hydraulic filter for wood splitter return lines. It has 3/4" pipe thread in & out's, a check valve, and a port for a temp probe. The whole thing cost about $25. 00 at the time. I got some 3/4"-1/2" barb fittings, and spliced it into the rubber line going into the hot side of the cooler, mounted the housing horizontally on the cross member ahead of the steering gear. Like the above post says, keeps the fluid clean, less residue in the pan, and adds a little oil capacity to your system. I have a single Geno's oil temp gauge for my transmission temp, and I got an extra probe for engine oil temp, taken at the port in the filter housing. I run both wires into an "on-on" switch, and toggle back & forth depending on which reading I want to watch. (Don't forget to idle your truck in"N", not "P")