We just finished repacking two 4-stop twin post AMEE's. We used the Texacone packings on car 1 and the Gorman packings on car 2. We always replace the check valves and o-rings since the pistons are pulled out to change the internal seals on the lower two pistons. I prefer the Gorman packings. They loaded through the seal tool easier and they seem to provide a smoother ride. We lube all the seals and o-rings with Texacone Jacks Green Slime. We put 1 quart of the Maxton Maxglide oil additive into the lower two pistons before screwing the heads back on. Does anyone know of a place that will test those TKE proprietary check valves? $380 bucks a pop is getting pretty ridiculous. I have a feeling most of them are still good. I have a whole bucket full of them.