Do yourself a couple of favors. First, blueprint all the linkage parts so that the places where the connect to each other are fully flat against themselves. Use the plastic washers/grease holders, and make sure all the rods are perfectly squared and in true alignment with each other. I had to bend mine a bit and flatten some of the ends slightly to attain near perfect fit.

Second, polish any burs from the contact points and use synthetic disc brake grease to lubricate all moving parts. It won't harm rubber or plastic, lubricates better and will outlast virtually every other lubricant, has wider temperature range and it resists washout better than virtually anything else.

In over 30 years, I've never felt a Mopar linkage work as well as mine after I'd done this, and all my Mopar buddies are blown away with how well the linkage works.